Calculate area instantly for flooring, carpet, tiles, landscaping & construction projects
Square footage is area expressed in square feet. This calculator helps you find the square footage, square inches, square yards, square meters, or acres for buildings, homes, gardens, flooring, carpet, tiles, or construction projects.
1. Select Your Shape: Choose from 8 different area shapes including square, rectangle, circle, triangle, trapezoid, and more complex shapes like rectangle borders and annulus.
2. Enter Measurements: Input your measurements in your preferred units - feet, inches, yards, centimeters, or meters. You can mix different units for different measurements, and the calculator will handle the conversions automatically.
3. Add Optional Details: Enter the quantity if you have multiple areas, add a waste factor percentage for material ordering, and input material costs to get total project estimates.
This calculator accepts measurements in both US and metric units:
Tip: If you have a measurement like 7'3", you can enter it as 7.25 feet (since 3"/12" = 0.25 ft).
Formula: Area = Side × Side
A square has all four sides equal. Simply enter the length of one side to calculate the area.
Formula: Area = Length × Width
The most common calculation. Multiply the length by the width to get the area in square feet.
Formula: Area = π × (Diameter ÷ 2)²
Enter the diameter (distance across the circle through the center) to calculate the circular area.
Formula: Area = √[s(s-a)(s-b)(s-c)] where s = (a+b+c)/2
This calculator uses Heron's formula. Enter all three side lengths to calculate the area.
Formula: Area = ((Side A + Side B) ÷ 2) × Height
A trapezoid has two parallel sides. Enter both parallel sides and the perpendicular height between them.
Formula: Border Area = Total Area - Inner Area
Calculate the area of borders, frames, or rings by subtracting the inner area from the outer area.
Use these conversion factors to convert between different area units:
| From | To | Multiply By |
|---|---|---|
| Square Feet | Square Inches | 144 |
| Square Feet | Square Yards | 0.11111 |
| Square Feet | Square Meters | 0.092903 |
| Square Feet | Acres | 0.00002296 |
| Square Yards | Square Feet | 9 |
| Square Meters | Square Feet | 10.7639 |
Calculate how much hardwood, laminate, tile, or vinyl flooring you need for rooms, hallways, and entire homes.
Determine wall and ceiling coverage to estimate paint gallons or wallpaper rolls needed.
Calculate areas for sod, mulch, gravel, pavers, decking, and garden beds.
Estimate materials for roofing, siding, drywall, and other construction projects.
Find the right carpet size and estimate costs for residential or commercial spaces.
Calculate total material costs by entering price per square unit with optional waste factor.