{"id":137,"date":"2026-07-08T07:02:36","date_gmt":"2026-07-08T07:02:36","guid":{"rendered":"https:\/\/squarefootcalc.com\/blog\/?p=137"},"modified":"2026-07-08T07:09:38","modified_gmt":"2026-07-08T07:09:38","slug":"how-to-calculate-square-footage-of-a-house","status":"publish","type":"post","link":"https:\/\/squarefootcalc.com\/blog\/how-to-calculate-square-footage-of-a-house\/","title":{"rendered":"How to Calculate Square Footage of a House (Complete Guide)"},"content":{"rendered":"\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Playfair+Display:ital,wght@0,400;0,700;1,400&#038;family=Source+Serif+4:opsz,wght@8..60,300;8..60,400;8..60,600&#038;display=swap\" rel=\"stylesheet\">\n<style>\n  :root {\n    --ink: #1a1612;\n    --paper: #faf7f2;\n    --cream: #f2ede3;\n    --rust: #b84c2a;\n    --gold: #c9983a;\n    --teal: #2a7c72;\n    --muted: #6b6257;\n    --border: #d9d0c3;\n    --highlight: #fff8e8;\n  }\n\n  * { box-sizing: border-box; margin: 0; padding: 0; }\n\n  .kicker {\n    font-family: 'Source Serif 4', serif;\n    font-size: 11px;\n    letter-spacing: 0.18em;\n    text-transform: uppercase;\n    color: var(--rust);\n    font-weight: 600;\n    margin-bottom: 14px;\n  }\n\n  .subtitle {\n    font-size: 1.1rem;\n    color: var(--muted);\n    line-height: 1.6;\n    max-width: 640px;\n    font-style: italic;\n  }\n\n  .divider {\n    border: none;\n    border-top: 1px solid var(--border);\n    margin: 48px 0;\n  }\n\n  h2 {\n    font-family: 'Playfair Display', serif;\n    font-size: 1.65rem;\n    font-weight: 700;\n    color: var(--ink);\n    margin: 56px 0 16px;\n    padding-bottom: 8px;\n    border-bottom: 2px solid var(--gold);\n    display: inline-block;\n  }\n\n  h3 {\n    font-family: 'Playfair Display', serif;\n    font-size: 1.2rem;\n    font-weight: 700;\n    color: var(--ink);\n    margin: 32px 0 12px;\n  }\n\n  p { margin-bottom: 18px; 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}\n\n  \/* FAQ *\/\n  .faq { margin: 24px 0; }\n  .faq-item { border-top: 1px solid var(--border); padding: 20px 0; }\n  .faq-q {\n    font-family: 'Playfair Display', serif;\n    font-size: 1.05rem;\n    font-weight: 700;\n    color: var(--ink);\n    margin-bottom: 8px;\n  }\n  .faq-a { color: var(--muted); font-size: 0.97rem; line-height: 1.7; margin: 0; }\n\n  \/* SVG DIAGRAM WRAPPER *\/\n  .diagram-wrap {\n    margin: 32px 0;\n    background: var(--cream);\n    border: 1px solid var(--border);\n    border-radius: 4px;\n    padding: 24px;\n    overflow-x: auto;\n  }\n  .diagram-wrap svg { display: block; margin: 0 auto; max-width: 100%; }\n\n  \/* STAT ROW *\/\n  .stat-row {\n    display: grid;\n    grid-template-columns: repeat(3, 1fr);\n    gap: 16px;\n    margin: 28px 0;\n  }\n  @media (max-width: 500px) { .stat-row { grid-template-columns: 1fr; } }\n  .stat-card {\n    background: white;\n    border: 1px solid var(--border);\n    border-radius: 3px;\n    padding: 20px;\n    text-align: center;\n  }\n  .stat-number {\n    font-family: 'Playfair Display', serif;\n    font-size: 1.9rem;\n    font-weight: 700;\n    color: var(--rust);\n    display: block;\n  }\n  .stat-label { font-size: 0.85rem; color: var(--muted); margin-top: 4px; }\n\n  \/* CTA BOX *\/\n  .cta-box {\n    background: var(--ink);\n    color: white;\n    border-radius: 4px;\n    padding: 28px 32px;\n    margin: 48px 0 24px;\n    text-align: center;\n  }\n  .cta-box p {\n    color: rgba(255,255,255,0.75);\n    margin-bottom: 16px;\n    font-size: 0.97rem;\n  }\n  .cta-btn {\n    display: inline-block;\n    background: var(--rust);\n    color: white;\n    font-family: 'Source Serif 4', serif;\n    font-weight: 600;\n    font-size: 0.9rem;\n    letter-spacing: 0.06em;\n    text-transform: uppercase;\n    padding: 12px 28px;\n    border-radius: 2px;\n    text-decoration: none;\n  }\n  .cta-btn:hover { background: #9e3e22; text-decoration: none; }\n<\/style>\n\n<!-- ARTICLE INTRO -->\n<header>\n  <p class=\"subtitle\">Whether you&#8217;re buying, selling, renovating, or just curious \u2014 here&#8217;s exactly how to measure a whole house, what counts and what doesn&#8217;t, and the mistakes that throw off your number.<\/p>\n<\/header>\n\n<div class=\"toc\">\n  <div class=\"toc-title\">In this guide<\/div>\n  <ol>\n    <li><a href=\"#what-counts\">What counts as square footage (and what doesn&#8217;t)<\/a><\/li>\n    <li><a href=\"#tools\">What you&#8217;ll need before you start<\/a><\/li>\n    <li><a href=\"#steps\">How to measure a whole house, step by step<\/a><\/li>\n    <li><a href=\"#tricky\">Stairs, open voids, and awkward spaces<\/a><\/li>\n    <li><a href=\"#exterior\">The exterior shortcut method<\/a><\/li>\n    <li><a href=\"#reference\">House size reference table<\/a><\/li>\n    <li><a href=\"#mistakes\">Common mistakes that throw off your number<\/a><\/li>\n    <li><a href=\"#faq\">Frequently asked questions<\/a><\/li>\n  <\/ol>\n<\/div>\n\n<p>Measuring a single room takes two minutes. Measuring a whole house is just that \u2014 repeated. The tricky part isn&#8217;t the math, it&#8217;s knowing which spaces to include, which to skip, and how to handle the awkward ones in between.<\/p>\n\n<p>Get this right and you&#8217;ll have a number you can use for real estate listings, renovation budgets, material estimates, and property tax assessments. Get it wrong and you could over-buy thousands of dollars of flooring or misrepresent your home&#8217;s value.<\/p>\n\n<hr class=\"divider\" id=\"what-counts\">\n\n<h2>What Counts \u2014 and What Doesn&#8217;t<\/h2>\n\n<p>This is the most important thing to understand before you pick up a tape measure. The rule of thumb: if a space is <strong>finished, heated, and livable<\/strong>, it counts. If it isn&#8217;t, it doesn&#8217;t.<\/p>\n\n<div class=\"counts-grid\">\n  <div class=\"counts-card yes\">\n    <div class=\"counts-card-title\">\n      <span class=\"counts-badge\">Counts<\/span>\n      Include these spaces\n    <\/div>\n    <ul class=\"counts-list\">\n      <li>Bedrooms, living rooms, dining rooms<\/li>\n      <li>Kitchen and utility rooms<\/li>\n      <li>Hallways, landings, and foyers<\/li>\n      <li>Closets and built-in storage<\/li>\n      <li>Finished basement (with proper walls, ceiling, and heat)<\/li>\n      <li>Finished attic (ceiling height typically 7 ft minimum)<\/li>\n      <li>Stairways \u2014 counted once, on one floor<\/li>\n    <\/ul>\n  <\/div>\n  <div class=\"counts-card no\">\n    <div class=\"counts-card-title\">\n      <span class=\"counts-badge\">Doesn&#8217;t count<\/span>\n      Exclude these spaces\n    <\/div>\n    <ul class=\"counts-list\">\n      <li>Attached or detached garages<\/li>\n      <li>Unfinished basements<\/li>\n      <li>Unfinished attics and crawl spaces<\/li>\n      <li>Covered porches, patios, or decks<\/li>\n      <li>Carports or outbuildings<\/li>\n      <li>Open double-height areas (counted at ground floor only)<\/li>\n    <\/ul>\n  <\/div>\n<\/div>\n\n<!-- VISUAL: What counts diagram -->\n<div class=\"diagram-wrap\">\n  <svg width=\"100%\" viewBox=\"0 0 680 370\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\">\n    <title>House cross-section showing which spaces count toward square footage<\/title>\n    <defs>\n      <pattern id=\"hatch\" width=\"8\" height=\"8\" patternUnits=\"userSpaceOnUse\" patternTransform=\"rotate(45)\">\n        <line x1=\"0\" y1=\"0\" x2=\"0\" y2=\"8\" stroke=\"#d9d0c3\" stroke-width=\"1.5\"\/>\n      <\/pattern>\n    <\/defs>\n\n    <!-- ROOF -->\n    <polygon points=\"340,30 560,120 120,120\" fill=\"#d9d0c3\" stroke=\"#b0a898\" stroke-width=\"1.5\"\/>\n    <!-- Attic label (counts) -->\n    <text x=\"340\" y=\"82\" text-anchor=\"middle\" font-family=\"'Source Serif 4', serif\" font-size=\"12\" fill=\"#1a6b56\" font-weight=\"600\">Finished attic \u2713<\/text>\n    <text x=\"340\" y=\"98\" text-anchor=\"middle\" font-family=\"'Source Serif 4', serif\" font-size=\"11\" fill=\"#6b6257\">(if ceiling \u2265 7 ft)<\/text>\n\n    <!-- SECOND FLOOR -->\n    <rect x=\"120\" y=\"120\" width=\"440\" height=\"90\" fill=\"#faf7f2\" stroke=\"#d9d0c3\" stroke-width=\"1.5\"\/>\n    <!-- Floor divider line -->\n    <line x1=\"120\" y1=\"210\" x2=\"560\" y2=\"210\" stroke=\"#d9d0c3\" stroke-width=\"1\"\/>\n    <!-- Second floor rooms -->\n    <rect x=\"128\" y=\"128\" width=\"145\" height=\"74\" fill=\"#f0f8f5\" stroke=\"#b2d8ce\" stroke-width=\"1\" rx=\"2\"\/>\n    <text x=\"200\" y=\"163\" text-anchor=\"middle\" font-family=\"'Source Serif 4', serif\" font-size=\"12\" fill=\"#1a6b56\" font-weight=\"600\">Bedroom \u2713<\/text>\n    <rect x=\"283\" y=\"128\" width=\"145\" height=\"74\" fill=\"#f0f8f5\" stroke=\"#b2d8ce\" stroke-width=\"1\" rx=\"2\"\/>\n    <text x=\"355\" y=\"163\" text-anchor=\"middle\" font-family=\"'Source Serif 4', serif\" font-size=\"12\" fill=\"#1a6b56\" font-weight=\"600\">Bedroom \u2713<\/text>\n    <!-- Stairwell on second floor -->\n    <rect x=\"438\" y=\"128\" width=\"70\" height=\"74\" fill=\"#fff8e8\" stroke=\"#c9983a\" stroke-width=\"1\" rx=\"2\"\/>\n    <text x=\"473\" y=\"158\" text-anchor=\"middle\" font-family=\"'Source Serif 4', serif\" font-size=\"11\" fill=\"#8a6820\" font-weight=\"600\">Stairs<\/text>\n    <text x=\"473\" y=\"173\" text-anchor=\"middle\" font-family=\"'Source Serif 4', serif\" font-size=\"10\" fill=\"#8a6820\">count once<\/text>\n    <!-- Hallway second floor -->\n    <rect x=\"518\" y=\"128\" width=\"34\" height=\"74\" fill=\"#f0f8f5\" stroke=\"#b2d8ce\" stroke-width=\"1\" rx=\"2\"\/>\n    <text x=\"535\" y=\"160\" text-anchor=\"middle\" font-family=\"'Source Serif 4', serif\" font-size=\"10\" fill=\"#1a6b56\" transform=\"rotate(-90,535,160)\">Hall \u2713<\/text>\n\n    <!-- FIRST FLOOR -->\n    <rect x=\"120\" y=\"210\" width=\"440\" height=\"95\" fill=\"#faf7f2\" stroke=\"#d9d0c3\" stroke-width=\"1.5\"\/>\n    <!-- First floor rooms -->\n    <rect x=\"128\" y=\"218\" width=\"130\" height=\"79\" fill=\"#f0f8f5\" stroke=\"#b2d8ce\" stroke-width=\"1\" rx=\"2\"\/>\n    <text x=\"193\" y=\"255\" text-anchor=\"middle\" font-family=\"'Source Serif 4', serif\" font-size=\"12\" fill=\"#1a6b56\" font-weight=\"600\">Living room \u2713<\/text>\n    <rect x=\"268\" y=\"218\" width=\"110\" height=\"79\" fill=\"#f0f8f5\" stroke=\"#b2d8ce\" stroke-width=\"1\" rx=\"2\"\/>\n    <text x=\"323\" y=\"255\" text-anchor=\"middle\" font-family=\"'Source Serif 4', serif\" font-size=\"12\" fill=\"#1a6b56\" font-weight=\"600\">Kitchen \u2713<\/text>\n    <rect x=\"388\" y=\"218\" width=\"80\" height=\"79\" fill=\"#f0f8f5\" stroke=\"#b2d8ce\" stroke-width=\"1\" rx=\"2\"\/>\n    <text x=\"428\" y=\"255\" text-anchor=\"middle\" font-family=\"'Source Serif 4', serif\" font-size=\"12\" fill=\"#1a6b56\" font-weight=\"600\">Bath \u2713<\/text>\n    <!-- Garage (doesn't count) -->\n    <rect x=\"478\" y=\"218\" width=\"74\" height=\"79\" fill=\"url(#hatch)\" stroke=\"#d9d0c3\" stroke-width=\"1\" rx=\"2\"\/>\n    <text x=\"515\" y=\"253\" text-anchor=\"middle\" font-family=\"'Source Serif 4', serif\" font-size=\"11\" fill=\"#8c3318\" font-weight=\"600\">Garage \u2717<\/text>\n\n    <!-- BASEMENT -->\n    <rect x=\"120\" y=\"305\" width=\"350\" height=\"55\" fill=\"#f8f5f0\" stroke=\"#d9d0c3\" stroke-width=\"1.5\"\/>\n    <text x=\"295\" y=\"332\" text-anchor=\"middle\" font-family=\"'Source Serif 4', serif\" font-size=\"12\" fill=\"#6b6257\">Finished basement \u2713  \/  Unfinished basement \u2717<\/text>\n    <!-- Unfinished section hatched -->\n    <rect x=\"470\" y=\"305\" width=\"90\" height=\"55\" fill=\"url(#hatch)\" stroke=\"#d9d0c3\" stroke-width=\"1\" rx=\"0\"\/>\n\n    <!-- Floor labels (left side) -->\n    <text x=\"110\" y=\"82\" text-anchor=\"end\" font-family=\"'Source Serif 4', serif\" font-size=\"11\" fill=\"#6b6257\">Attic<\/text>\n    <text x=\"110\" y=\"165\" text-anchor=\"end\" font-family=\"'Source Serif 4', serif\" font-size=\"11\" fill=\"#6b6257\">2nd floor<\/text>\n    <text x=\"110\" y=\"260\" text-anchor=\"end\" font-family=\"'Source Serif 4', serif\" font-size=\"11\" fill=\"#6b6257\">1st floor<\/text>\n    <text x=\"110\" y=\"335\" text-anchor=\"end\" font-family=\"'Source Serif 4', serif\" font-size=\"11\" fill=\"#6b6257\">Basement<\/text>\n\n    <!-- Legend -->\n    <rect x=\"140\" y=\"345\" width=\"14\" height=\"14\" fill=\"#f0f8f5\" stroke=\"#b2d8ce\" stroke-width=\"1\" rx=\"2\"\/>\n    <text x=\"160\" y=\"357\" font-family=\"'Source Serif 4', serif\" font-size=\"11\" fill=\"#1a6b56\">Counts toward square footage<\/text>\n    <rect x=\"360\" y=\"345\" width=\"14\" height=\"14\" fill=\"url(#hatch)\" stroke=\"#d9d0c3\" stroke-width=\"1\" rx=\"2\"\/>\n    <text x=\"380\" y=\"357\" font-family=\"'Source Serif 4', serif\" font-size=\"11\" fill=\"#8c3318\">Does not count<\/text>\n  <\/svg>\n<\/div>\n\n<hr class=\"divider\" id=\"tools\">\n\n<h2>What You&#8217;ll Need<\/h2>\n\n<div class=\"stat-row\">\n  <div class=\"stat-card\">\n    <span class=\"stat-number\">25\u201335 ft<\/span>\n    <div class=\"stat-label\">Tape measure length \u2014 longer is better for large rooms<\/div>\n  <\/div>\n  <div class=\"stat-card\">\n    <span class=\"stat-number\">30\u201360 min<\/span>\n    <div class=\"stat-label\">Time needed for an average two-story home<\/div>\n  <\/div>\n  <div class=\"stat-card\">\n    <span class=\"stat-number\">1 per floor<\/span>\n    <div class=\"stat-label\">Sketches needed \u2014 draw each floor separately<\/div>\n  <\/div>\n<\/div>\n\n<p>Bring a notepad or use your phone&#8217;s notes app to record each measurement as you go. You&#8217;ll also want a pencil to sketch a rough floor plan for each level before you start measuring \u2014 it doesn&#8217;t have to be accurate, just enough to label each room and track what you&#8217;ve covered.<\/p>\n\n<p>For the actual calculations, <a href=\"https:\/\/squarefootcalc.com\/\">SquareFootCalc.com<\/a> lets you enter each room and add them up \u2014 faster than doing it by hand when you&#8217;re measuring ten or more spaces.<\/p>\n\n<hr class=\"divider\" id=\"steps\">\n\n<h2>Step-by-Step: How to Measure a House<\/h2>\n\n<div class=\"steps\">\n  <div class=\"step\">\n    <div class=\"step-num\">1<\/div>\n    <div class=\"step-content\">\n      <strong>Sketch a rough floor plan for each level<\/strong>\n      Before you pick up the tape measure, draw a simple outline of each floor on paper. Label each room. The sketch doesn&#8217;t need to be to scale \u2014 just clear enough that you can write measurements next to each wall and know what you&#8217;ve covered. A two-story house needs two sketches. A house with a finished basement needs three.\n    <\/div>\n  <\/div>\n  <div class=\"step\">\n    <div class=\"step-num\">2<\/div>\n    <div class=\"step-content\">\n      <strong>Measure each room \u2014 length \u00d7 width<\/strong>\n      Go room by room and measure the longest wall (length) and the adjacent wall (width). Write both numbers on your sketch. Measure wall-to-wall inside \u2014 not the exterior, which includes wall thickness and gives a slightly inflated number.\n      <div class=\"example-box\">\n        <div class=\"ex-label\">Example \u2014 master bedroom<\/div>\n        Length: 14 ft &nbsp;\u00d7&nbsp; Width: 12 ft = <span class=\"ex-answer\">168 sq ft<\/span>\n      <\/div>\n    <\/div>\n  <\/div>\n  <div class=\"step\">\n    <div class=\"step-num\">3<\/div>\n    <div class=\"step-content\">\n      <strong>Include closets, hallways, and laundry rooms<\/strong>\n      These are the most commonly skipped spaces \u2014 and they add up fast. A master closet that&#8217;s 6 \u00d7 5 ft is 30 sq ft. Four bedrooms with similar closets means 100+ sq ft you haven&#8217;t counted yet. Measure them the same way: length \u00d7 width, add to your running total.\n    <\/div>\n  <\/div>\n  <div class=\"step\">\n    <div class=\"step-num\">4<\/div>\n    <div class=\"step-content\">\n      <strong>Handle irregular rooms by splitting them<\/strong>\n      L-shaped rooms, rooms with bump-outs, and open kitchen\/living combos don&#8217;t fit a single rectangle. Draw a dividing line to split them into two rectangles. Measure each rectangle separately and add them together.\n      <div class=\"example-box\">\n        <div class=\"ex-label\">Example \u2014 L-shaped living\/dining area<\/div>\n        Section A: 18 \u00d7 14 = 252 sq ft<br>\n        Section B: 10 \u00d7 8 = 80 sq ft<br>\n        <span class=\"ex-answer\">Total: 332 sq ft<\/span>\n      <\/div>\n    <\/div>\n  <\/div>\n  <div class=\"step\">\n    <div class=\"step-num\">5<\/div>\n    <div class=\"step-content\">\n      <strong>Add up all rooms to get each floor&#8217;s total<\/strong>\n      Once you&#8217;ve measured every room on a floor \u2014 including closets, bathrooms, hallways, and the staircase footprint \u2014 add them all together for a floor total.\n    <\/div>\n  <\/div>\n  <div class=\"step\">\n    <div class=\"step-num\">6<\/div>\n    <div class=\"step-content\">\n      <strong>Repeat for every floor and add floor totals together<\/strong>\n      Measure each level separately and sum the floor totals. That&#8217;s your total house square footage.\n      <div class=\"example-box\">\n        <div class=\"ex-label\">Example \u2014 two-story home<\/div>\n        Ground floor: 1,040 sq ft<br>\n        Upper floor: 860 sq ft<br>\n        <span class=\"ex-answer\">Total house: 1,900 sq ft<\/span>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/div>\n\n<!-- Floor plan diagram -->\n<div class=\"diagram-wrap\">\n  <svg width=\"100%\" viewBox=\"0 0 680 360\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\">\n    <title>Sample floor plan showing how to split a house into measured rooms<\/title>\n\n    <!-- TITLE -->\n    <text x=\"340\" y=\"28\" text-anchor=\"middle\" font-family=\"'Playfair Display', serif\" font-size=\"14\" font-weight=\"700\" fill=\"#1a1612\">Sample floor plan \u2014 ground floor<\/text>\n\n    <!-- Outer walls -->\n    <rect x=\"60\" y=\"45\" width=\"560\" height=\"290\" fill=\"#faf7f2\" stroke=\"#1a1612\" stroke-width=\"2.5\" rx=\"2\"\/>\n\n    <!-- Interior walls -->\n    <line x1=\"60\" y1=\"185\" x2=\"400\" y2=\"185\" stroke=\"#1a1612\" stroke-width=\"1.5\"\/>\n    <line x1=\"250\" y1=\"45\" x2=\"250\" y2=\"335\" stroke=\"#1a1612\" stroke-width=\"1.5\"\/>\n    <line x1=\"400\" y1=\"45\" x2=\"400\" y2=\"335\" stroke=\"#1a1612\" stroke-width=\"1.5\"\/>\n    <line x1=\"60\" y1=\"255\" x2=\"250\" y2=\"255\" stroke=\"#1a1612\" stroke-width=\"1.5\"\/>\n    <line x1=\"400\" y1=\"185\" x2=\"400\" y2=\"335\" stroke=\"#1a1612\" stroke-width=\"0\"\/>\n\n    <!-- ROOM A: Living Room -->\n    <rect x=\"63\" y=\"48\" width=\"184\" height=\"134\" fill=\"#f0f8f5\" stroke=\"none\"\/>\n    <text x=\"155\" y=\"108\" text-anchor=\"middle\" font-family=\"'Playfair Display', serif\" font-size=\"13\" font-weight=\"700\" fill=\"#1a6b56\">Living Room<\/text>\n    <text x=\"155\" y=\"126\" text-anchor=\"middle\" font-family=\"'Source Serif 4', serif\" font-size=\"11\" fill=\"#6b6257\">18 \u00d7 12 = 216 sq ft<\/text>\n\n    <!-- ROOM B: Kitchen -->\n    <rect x=\"253\" y=\"48\" width=\"144\" height=\"134\" fill=\"#fff8e8\" stroke=\"none\"\/>\n    <text x=\"325\" y=\"108\" text-anchor=\"middle\" font-family=\"'Playfair Display', serif\" font-size=\"13\" font-weight=\"700\" fill=\"#8a6820\">Kitchen<\/text>\n    <text x=\"325\" y=\"126\" text-anchor=\"middle\" font-family=\"'Source Serif 4', serif\" font-size=\"11\" fill=\"#6b6257\">12 \u00d7 12 = 144 sq ft<\/text>\n\n    <!-- ROOM C: Garage (hatched) -->\n    <defs>\n      <pattern id=\"hatch2\" width=\"8\" height=\"8\" patternUnits=\"userSpaceOnUse\" patternTransform=\"rotate(45)\">\n        <line x1=\"0\" y1=\"0\" x2=\"0\" y2=\"8\" stroke=\"#d9d0c3\" stroke-width=\"1.5\"\/>\n      <\/pattern>\n    <\/defs>\n    <rect x=\"403\" y=\"48\" width=\"214\" height=\"284\" fill=\"url(#hatch2)\" stroke=\"none\"\/>\n    <text x=\"510\" y=\"183\" text-anchor=\"middle\" font-family=\"'Playfair Display', serif\" font-size=\"13\" font-weight=\"700\" fill=\"#8c3318\">Garage<\/text>\n    <text x=\"510\" y=\"200\" text-anchor=\"middle\" font-family=\"'Source Serif 4', serif\" font-size=\"11\" fill=\"#8c3318\">Not counted \u2717<\/text>\n\n    <!-- ROOM D: Hallway -->\n    <rect x=\"63\" y=\"188\" width=\"184\" height=\"64\" fill=\"#f5f5f0\" stroke=\"none\"\/>\n    <text x=\"155\" y=\"222\" text-anchor=\"middle\" font-family=\"'Playfair Display', serif\" font-size=\"12\" font-weight=\"700\" fill=\"#6b6257\">Hallway + Stairs<\/text>\n    <text x=\"155\" y=\"238\" text-anchor=\"middle\" font-family=\"'Source Serif 4', serif\" font-size=\"11\" fill=\"#6b6257\">18 \u00d7 6 = 108 sq ft<\/text>\n\n    <!-- ROOM E: Dining -->\n    <rect x=\"253\" y=\"188\" width=\"144\" height=\"144\" fill=\"#f0f5f8\" stroke=\"none\"\/>\n    <text x=\"325\" y=\"253\" text-anchor=\"middle\" font-family=\"'Playfair Display', serif\" font-size=\"13\" font-weight=\"700\" fill=\"#1a4a6b\">Dining Room<\/text>\n    <text x=\"325\" y=\"270\" text-anchor=\"middle\" font-family=\"'Source Serif 4', serif\" font-size=\"11\" fill=\"#6b6257\">12 \u00d7 12 = 144 sq ft<\/text>\n\n    <!-- ROOM F: Bathroom -->\n    <rect x=\"63\" y=\"258\" width=\"184\" height=\"74\" fill=\"#f0f8f5\" stroke=\"none\"\/>\n    <text x=\"155\" y=\"293\" text-anchor=\"middle\" font-family=\"'Playfair Display', serif\" font-size=\"12\" font-weight=\"700\" fill=\"#1a6b56\">Bathroom + Closet<\/text>\n    <text x=\"155\" y=\"310\" text-anchor=\"middle\" font-family=\"'Source Serif 4', serif\" font-size=\"11\" fill=\"#6b6257\">18 \u00d7 7 = 126 sq ft<\/text>\n\n    <!-- TOTAL BAR -->\n    <rect x=\"60\" y=\"340\" width=\"340\" height=\"1\" fill=\"#d9d0c3\"\/>\n    <text x=\"230\" y=\"358\" text-anchor=\"middle\" font-family=\"'Playfair Display', serif\" font-size=\"13\" font-weight=\"700\" fill=\"#1a1612\">Ground floor total: 738 sq ft<\/text>\n\n    <!-- Dimension arrows top -->\n    <line x1=\"60\" y1=\"38\" x2=\"400\" y2=\"38\" stroke=\"#6b6257\" stroke-width=\"1\"\/>\n    <polygon points=\"60,35 60,41 53,38\" fill=\"#6b6257\"\/>\n    <polygon points=\"400,35 400,41 407,38\" fill=\"#6b6257\"\/>\n    <text x=\"230\" y=\"35\" text-anchor=\"middle\" font-family=\"'Source Serif 4', serif\" font-size=\"10\" fill=\"#6b6257\">Measured interior only<\/text>\n  <\/svg>\n<\/div>\n\n<hr class=\"divider\" id=\"tricky\">\n\n<h2>Stairs, Open Voids, and Awkward Spaces<\/h2>\n\n<div class=\"method-card\" data-label=\"Stairs\">\n  <h3>How to Count Stairways<\/h3>\n  <p>Count the staircase <strong>once<\/strong>, on the floor where it begins. Measure the total footprint \u2014 the floor space the staircase occupies (length \u00d7 width) \u2014 and include it in that floor&#8217;s total. Do not count it again on the upper floor.<\/p>\n  <div class=\"formula-box\">\n    <div class=\"formula-label\">Staircase footprint<\/div>\n    <div class=\"formula-text\">Length of stair run \u00d7 Width of staircase = sq ft (counted on starting floor only)<\/div>\n  <\/div>\n<\/div>\n\n<div class=\"method-card\" data-label=\"Open Double-Height Areas\">\n  <h3>Two-Story Voids and Open-Plan Entryways<\/h3>\n  <p>Some homes have a dramatic entryway or living room where the ceiling soars up through the second floor. The open air above is not livable space. Measure and count that area <strong>once only<\/strong>, at ground floor level. The second floor should show a &#8220;missing&#8221; section where the void is \u2014 do not include it in the upper floor total.<\/p>\n<\/div>\n\n<div class=\"method-card\" data-label=\"Measurements with Inches\">\n  <h3>When Your Measurements Include Inches<\/h3>\n  <p>Most rooms won&#8217;t be a clean number of feet. When measurements include inches, convert to decimal feet before multiplying.<\/p>\n  <div class=\"formula-box\">\n    <div class=\"formula-label\">Converting inches to decimal feet<\/div>\n    <div class=\"formula-text\">Inches \u00f7 12 = decimal feet &nbsp;&nbsp;\u2192&nbsp;&nbsp; 14 ft 9 in = 14 + (9 \u00f7 12) = 14.75 ft<\/div>\n  <\/div>\n  <div class=\"example-box\">\n    <div class=\"ex-label\">Example<\/div>\n    Room is 14 ft 9 in \u00d7 11 ft 6 in<br>\n    = 14.75 \u00d7 11.5<br>\n    <span class=\"ex-answer\">= 169.6 sq ft<\/span>\n  <\/div>\n  <p style=\"margin-top:12px; font-size:0.93rem; color:var(--muted);\">If this feels tedious for every room, <a href=\"https:\/\/squarefootcalc.com\/\">SquareFootCalc.com<\/a> handles the inch conversion automatically.<\/p>\n<\/div>\n\n<hr class=\"divider\" id=\"exterior\">\n\n<h2>The Exterior Shortcut Method<\/h2>\n\n<p>If your house is a simple rectangular shape \u2014 a two-story box, a ranch-style single level \u2014 you can get a quick estimate by measuring the outside instead of going room by room.<\/p>\n\n<div class=\"steps\">\n  <div class=\"step\">\n    <div class=\"step-num\">1<\/div>\n    <div class=\"step-content\">\n      <strong>Measure the exterior length and width<\/strong>\n      Stand outside and measure the full length and width of the house&#8217;s footprint. This is the distance from one outside wall to the other.\n    <\/div>\n  <\/div>\n  <div class=\"step\">\n    <div class=\"step-num\">2<\/div>\n    <div class=\"step-content\">\n      <strong>Multiply and apply the number of floors<\/strong>\n      Length \u00d7 Width \u00d7 Number of floors gives you gross exterior square footage.\n      <div class=\"example-box\">\n        <div class=\"ex-label\">Example<\/div>\n        Exterior: 42 ft \u00d7 28 ft = 1,176 sq ft per floor<br>\n        Two stories: 1,176 \u00d7 2 = <span class=\"ex-answer\">2,352 sq ft (gross exterior)<\/span>\n      <\/div>\n    <\/div>\n  <\/div>\n  <div class=\"step\">\n    <div class=\"step-num\">3<\/div>\n    <div class=\"step-content\">\n      <strong>Subtract for walls and non-livable space<\/strong>\n      Exterior measurements include wall thickness (typically 4\u20138 inches per wall) and attached garages or non-livable areas. For a rough interior estimate, subtract 5\u20138% from your gross number.\n      <div class=\"example-box\">\n        <div class=\"ex-label\">Adjusted estimate<\/div>\n        2,352 sq ft \u00d7 0.93 (subtract 7%) = <span class=\"ex-answer\">\u2248 2,187 sq ft interior<\/span>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/div>\n\n<div class=\"callout\">\n  <div class=\"callout-title\">When to use the exterior method vs. room-by-room<\/div>\n  <p style=\"margin:0; font-size:0.95rem; color:var(--muted); line-height:1.7;\">Use the <strong>exterior method<\/strong> for quick estimates when your house is a clean rectangle or two-story box and you don&#8217;t need precision. Use the <strong>room-by-room method<\/strong> for any real estate listing, renovation budget, appraisal, or situation where you need an accurate interior number. The exterior method can be off by 5\u201315% depending on wall thickness and attached structures.<\/p>\n<\/div>\n\n<hr class=\"divider\" id=\"reference\">\n\n<h2>House Size Reference<\/h2>\n\n<p>Not sure if your number is in the right ballpark? Here&#8217;s how US home sizes typically break down:<\/p>\n\n<table>\n  <thead>\n    <tr>\n      <th>Home Type<\/th>\n      <th>Typical Square Footage<\/th>\n      <th>Notes<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td>Studio \/ Small apartment<\/td>\n      <td>300 \u2013 600 sq ft<\/td>\n      <td>Single open space, no separate bedroom<\/td>\n    <\/tr>\n    <tr>\n      <td>One-bedroom apartment<\/td>\n      <td>600 \u2013 900 sq ft<\/td>\n      <td>Separate bedroom, compact kitchen and living<\/td>\n    <\/tr>\n    <tr>\n      <td>Small house (2 bed)<\/td>\n      <td>900 \u2013 1,400 sq ft<\/td>\n      <td>Starter homes, bungalows, older builds<\/td>\n    <\/tr>\n    <tr>\n      <td>Average US home (2024)<\/td>\n      <td>~2,300 sq ft<\/td>\n      <td>3 bed \/ 2 bath, national median<\/td>\n    <\/tr>\n    <tr>\n      <td>Large family home<\/td>\n      <td>2,500 \u2013 4,000 sq ft<\/td>\n      <td>4+ bedrooms, multiple living areas<\/td>\n    <\/tr>\n    <tr>\n      <td>Luxury \/ custom home<\/td>\n      <td>4,000+ sq ft<\/td>\n      <td>Large rooms, bonus spaces, media rooms<\/td>\n    <\/tr>\n    <tr>\n      <td>Mobile \/ manufactured home<\/td>\n      <td>600 \u2013 1,800 sq ft<\/td>\n      <td>Single-wide vs. double-wide varies significantly<\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\n\n<hr class=\"divider\" id=\"mistakes\">\n\n<h2>Common Mistakes That Throw Off Your Number<\/h2>\n\n<div class=\"tips-grid\">\n  <div class=\"tip-card\">\n    <div class=\"tip-icon\">\ud83c\udfe0<\/div>\n    <strong>Including the garage<\/strong>\n    <p>Garages \u2014 attached or detached \u2014 don&#8217;t count as livable square footage. Even a heated, drywalled garage is still excluded by most real estate and appraisal standards. List it separately if you want to mention it.<\/p>\n  <\/div>\n  <div class=\"tip-card\">\n    <div class=\"tip-icon\">\ud83d\udeaa<\/div>\n    <strong>Skipping closets and hallways<\/strong>\n    <p>These are the most commonly forgotten spaces. A three-bedroom house can easily have 100\u2013150 sq ft in closets and hallways alone. They count \u2014 measure them.<\/p>\n  <\/div>\n  <div class=\"tip-card\">\n    <div class=\"tip-icon\">\ud83d\udcd0<\/div>\n    <strong>Measuring the exterior instead of interior<\/strong>\n    <p>Exterior measurements include wall thickness \u2014 typically 4\u20138 inches per wall. For accurate interior square footage, always measure inside, wall to wall.<\/p>\n  <\/div>\n  <div class=\"tip-card\">\n    <div class=\"tip-icon\">\ud83e\ude9c<\/div>\n    <strong>Double-counting stairs<\/strong>\n    <p>Staircase footprint is counted once, on the floor where it starts. Don&#8217;t add it to both the ground floor and the upper floor totals.<\/p>\n  <\/div>\n  <div class=\"tip-card\">\n    <div class=\"tip-icon\">\ud83e\ude9f<\/div>\n    <strong>Counting open double-height areas twice<\/strong>\n    <p>A two-story entryway or vaulted ceiling section is counted at ground floor level only. The empty air above is not floor space \u2014 don&#8217;t add it again on the second floor.<\/p>\n  <\/div>\n  <div class=\"tip-card\">\n    <div class=\"tip-icon\">\ud83c\udfda\ufe0f<\/div>\n    <strong>Including unfinished basement space<\/strong>\n    <p>An unfinished basement \u2014 exposed concrete, no drywall, no HVAC \u2014 does not count. A finished basement with proper walls, ceiling, and heat typically does. When in doubt, check your local appraisal standards, as conventions vary by state.<\/p>\n  <\/div>\n<\/div>\n\n<hr class=\"divider\" id=\"faq\">\n\n<h2>Frequently Asked Questions<\/h2>\n\n<div class=\"faq\">\n  <div class=\"faq-item\">\n    <div class=\"faq-q\">Should I measure the inside or outside of the house?<\/div>\n    <p class=\"faq-a\">For livable interior square footage \u2014 which is what real estate listings, appraisals, and material estimates use \u2014 measure inside, wall to wall. Exterior measurements include wall thickness and will give you a slightly higher number that doesn&#8217;t represent the actual living area.<\/p>\n  <\/div>\n  <div class=\"faq-item\">\n    <div class=\"faq-q\">Does square footage include the garage?<\/div>\n    <p class=\"faq-a\">No. Garages are not included in a home&#8217;s square footage, whether attached or detached. They may be listed separately in real estate listings as &#8220;total attached garage: XXX sq ft&#8221; \u2014 but they don&#8217;t go into the main number.<\/p>\n  <\/div>\n  <div class=\"faq-item\">\n    <div class=\"faq-q\">Does a finished basement count toward square footage?<\/div>\n    <p class=\"faq-a\">Usually yes \u2014 but it depends on your state and local appraisal standards. In most regions, a finished basement with proper ceilings, walls, flooring, and heating counts as livable square footage. An unfinished basement does not. Some appraisers list above-grade and below-grade square footage separately, even when both are finished. Check your local conventions when listing a property.<\/p>\n  <\/div>\n  <div class=\"faq-item\">\n    <div class=\"faq-q\">Can I just look up my home&#8217;s square footage instead of measuring it?<\/div>\n    <p class=\"faq-a\">Your county assessor&#8217;s records will have a square footage figure on file \u2014 usually available online through the county&#8217;s property search portal. It&#8217;s generally accurate but may not reflect additions, renovations, or conversions done after the last assessment. It&#8217;s a good starting point, but if you&#8217;re listing your home for sale or pulling a permit, measuring yourself (or hiring an appraiser) is more reliable.<\/p>\n  <\/div>\n  <div class=\"faq-item\">\n    <div class=\"faq-q\">How accurate do I need to be?<\/div>\n    <p class=\"faq-a\">For personal use \u2014 estimating flooring, comparing rooms, planning furniture \u2014 within 2\u20133% is plenty. For real estate listings or appraisals, within 1% is the target. For permit applications or formal appraisals, hire a professional with calibrated equipment.<\/p>\n  <\/div>\n  <div class=\"faq-item\">\n    <div class=\"faq-q\">My house has a complicated shape with multiple bump-outs. How do I handle that?<\/div>\n    <p class=\"faq-a\">Sketch the floor plan and draw lines to break the irregular shape into rectangles. Measure each rectangle separately \u2014 length \u00d7 width \u2014 then add them together. Most complex floor plans break cleanly into 3\u20136 rectangles. For anything with curves or angled walls, split off the curved or angled section, calculate it separately using the circle or triangle formula, and add it to your rectangle totals.<\/p>\n  <\/div>\n  <div class=\"faq-item\">\n    <div class=\"faq-q\">What if opposite walls measure slightly different lengths?<\/div>\n    <p class=\"faq-a\">Rooms are rarely perfectly square \u2014 walls can bow slightly or be built slightly off. Measure both pairs of opposite walls and average each pair. If the north wall is 18 ft 2 in and the south wall is 17 ft 10 in, use 18 ft as your length. It&#8217;s not perfect, but it&#8217;s far more accurate than picking one wall and assuming the other matches.<\/p>\n  <\/div>\n<\/div>\n\n<div class=\"cta-box\">\n  <p>Need to calculate square footage for multiple rooms fast?<\/p>\n  <a href=\"https:\/\/squarefootcalc.com\/\" class=\"cta-btn\">Use the Free Calculator \u2192<\/a>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Whether you&#8217;re buying, selling, renovating, or just curious \u2014 here&#8217;s exactly how to measure a whole house, what counts and what doesn&#8217;t, and the mistakes that throw off your number. In this guide What counts as square footage (and what doesn&#8217;t) What you&#8217;ll need before you start How to measure a whole house, step by&#8230;<\/p>\n","protected":false},"author":1,"featured_media":140,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-137","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"taxonomy_info":{"category":[{"value":1,"label":"Blog"}]},"featured_image_src_large":["https:\/\/squarefootcalc.com\/blog\/wp-content\/uploads\/2026\/07\/How-to-Calculate-Square-Footage-of-a-House-Complete-Guide-1024x683.webp",1024,683,true],"author_info":{"display_name":"Luke","author_link":"https:\/\/squarefootcalc.com\/blog\/author\/aziz315\/"},"comment_info":0,"category_info":[{"term_id":1,"name":"Blog","slug":"blog","term_group":0,"term_taxonomy_id":1,"taxonomy":"category","description":"","parent":0,"count":30,"filter":"raw","cat_ID":1,"category_count":30,"category_description":"","cat_name":"Blog","category_nicename":"blog","category_parent":0}],"tag_info":false,"_links":{"self":[{"href":"https:\/\/squarefootcalc.com\/blog\/wp-json\/wp\/v2\/posts\/137","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/squarefootcalc.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/squarefootcalc.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/squarefootcalc.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/squarefootcalc.com\/blog\/wp-json\/wp\/v2\/comments?post=137"}],"version-history":[{"count":2,"href":"https:\/\/squarefootcalc.com\/blog\/wp-json\/wp\/v2\/posts\/137\/revisions"}],"predecessor-version":[{"id":139,"href":"https:\/\/squarefootcalc.com\/blog\/wp-json\/wp\/v2\/posts\/137\/revisions\/139"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/squarefootcalc.com\/blog\/wp-json\/wp\/v2\/media\/140"}],"wp:attachment":[{"href":"https:\/\/squarefootcalc.com\/blog\/wp-json\/wp\/v2\/media?parent=137"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/squarefootcalc.com\/blog\/wp-json\/wp\/v2\/categories?post=137"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/squarefootcalc.com\/blog\/wp-json\/wp\/v2\/tags?post=137"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}