Square Footage Calculator — Free 2026
Calculate the area of any room or space in square feet, square meters, square yards and acres. Estimate material and project costs.
Area Results
How It Works
- Select a shape
- Enter dimensions
- View results and costs
How to Calculate Square Footage
Square footage is one of the most fundamental measurements in real estate, construction, renovation and interior design. Whether you are buying a home, installing new flooring, painting walls, laying sod, or estimating project costs, knowing the exact square footage of a space is essential. This calculator supports three common shapes and automatically converts between square feet, square meters, square yards and acres.
Measuring Your Room
For the most accurate results, use a tape measure and measure to the nearest inch. For a rectangular room, measure the longest wall for length and the adjacent wall for width. If the room has alcoves, closets or bump-outs, break it into separate rectangles, calculate each one, and add the results. For large outdoor areas, a measuring wheel or laser distance meter can speed up the process. Remember to measure in a straight line from wall to wall, not along baseboards or molding which can add extra inches.
Common Room Sizes
Standard room sizes vary by home age and regional building practices. A typical master bedroom is 200-300 square feet (14x16 to 16x20), a standard bedroom is 120-180 square feet (10x12 to 12x15), and a single-car garage is about 200 square feet (10x20). A two-car garage averages 400-500 square feet. Knowing these benchmarks helps you quickly estimate whether a quoted area is reasonable. For cost comparisons, try our percentage calculator to figure price differences between properties.
Price Per Square Foot
The price per square foot metric is used across real estate and construction to compare costs on an equal basis. In US real estate, the national median is roughly $150-200 per square foot for existing homes in 2026, though this varies enormously by market. For renovation projects, hardwood flooring averages $8-15 per square foot installed, ceramic tile $7-14, laminate $3-8, and carpet $2-7. Painting typically costs $2-6 per square foot of wall area. Enter a per-square-foot price above to instantly see the total cost for your space.
Unit Conversions
This calculator converts automatically, but here are the key conversion factors for reference: 1 square foot = 0.0929 square meters = 0.1111 square yards. One acre equals 43,560 square feet. One hectare equals 10,764 square feet. For international projects, you can also use our unit converter for a wider range of measurement conversions including length, volume and weight.
Frequently Asked Questions
For a rectangle, multiply length by width. For a circle, use pi times the radius squared. For a triangle, multiply base by height and divide by two. Measure each dimension in feet and the result will be in square feet. If you measure in meters, multiply the result by 10.764 to convert to square feet.
Measure the length and width of your room in feet using a tape measure. Multiply the two numbers together to get the square footage. For example, a room that is 12 feet by 15 feet is 180 square feet. For L-shaped rooms, divide the space into two rectangles, calculate each area separately, and add them together.
Price per square foot varies dramatically by location and property type. In 2026, the US national average for existing homes is roughly $150-$200 per square foot, but this ranges from under $100 in rural areas to over $1,000 in premium urban markets like Manhattan or San Francisco. For renovation costs, flooring averages $5-$15 per square foot and painting averages $2-$6 per square foot.
Break the irregular room into simple geometric shapes like rectangles, triangles, and circles. Calculate the area of each shape separately and add them together. For L-shaped rooms, divide into two rectangles. For rooms with bay windows, add the main rectangle plus the triangle or trapezoid of the bay. For curved walls, approximate with a semicircle.
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