Square Footage Calculator

Calculate square footage for any shape. Supports rectangles, circles, triangles, trapezoids, and L-shapes. Add multiple rooms, convert between units, and estimate project costs.

Dimensions

ft / in
ft / in

Preview

Area Results

Square Feet

120

ft²

Square Meters

11.15

m²

Square Yards

13.33

yd²

Acres

0.002755

ac

Room Calculator

Calculate each room above, name it, and add it to your list. Get a combined total for your entire project.

Current area: 120 sq ft

Cost Estimator

Enter a price per square foot to estimate your total project cost for flooring, painting, tiling, or other materials.

Current Shape Cost

$420.00

120 sq ft × $3.50

Common material costs (approximate):

Common Area Conversions

FromToMultiply by
1 sq ftsq meters0.0929
1 sq metersq feet10.7639
1 sq ftsq inches144
1 sq yardsq feet9
1 sq ftsq yards0.1111
1 acresq feet43,560
1 sq ftacres0.0000229568
1 hectaresq feet107,639
1 sq metersq yards1.19599
1 acresq meters4,046.86

How to Use the Square Footage Calculator

Select a shape that matches the area you want to measure: rectangle for standard rooms, circle for round spaces, triangle for angled areas, trapezoid for tapered spaces, or L-shape for rooms with alcoves. Enter your dimensions in feet and inches or switch to metric mode for meters. The calculator instantly shows results in square feet, square meters, square yards, and acres.

Room Calculator

Use the room calculator to measure entire homes or multi-room projects. Calculate each room individually, give it a name, and add it to your list. The calculator keeps a running total so you can see the combined square footage of all rooms at a glance.

Cost Estimator

Enter a price per square foot to estimate material and project costs. This works for flooring, painting, tiling, carpet, and other projects priced by area. The estimator uses either the current shape calculation or the total from your room list.

Frequently Asked Questions

How do I calculate the square footage of a room?+
Measure the length and width of the room in feet, then multiply them together. For example, a 12 ft by 10 ft room is 120 square feet. If the room is not a simple rectangle, break it into smaller rectangles, calculate each area, and add them together.
How many square feet are in an acre?+
There are exactly 43,560 square feet in one acre. To convert square feet to acres, divide the square footage by 43,560. For example, 10,000 sq ft equals approximately 0.23 acres.
How do I convert square feet to square meters?+
Multiply the square footage by 0.0929 to get square meters. For example, 500 square feet equals approximately 46.45 square meters. To convert from square meters to square feet, multiply by 10.764.
How do I calculate the square footage of an irregularly shaped room?+
Break the irregular shape into standard geometric shapes such as rectangles, triangles, or circles. Calculate the area of each shape separately, then add them all together. This calculator's L-Shape mode and room calculator make this easy for common layouts.
How much flooring do I need? Should I buy extra?+
Calculate the total square footage of all rooms you want to floor. It is standard practice to add 10% extra for waste from cuts, mistakes, and future repairs. For diagonal or pattern installations, add 15-20% extra material.
What is the difference between square feet and linear feet?+
Linear feet measures length in a straight line (one dimension), while square feet measures area (two dimensions). For example, a board that is 1 foot wide and 8 feet long is 8 linear feet but also 8 square feet. Knowing the difference is important when purchasing materials.

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Square Footage Calculator — free online square footage calculator, sq ft calculator, area calculator, square feet calculator, room size calculator, floor area calculator, square meter to square feet, flooring calculator, square footage of a room, land area calculator. No signup required. Works in your browser.