Free everyday calculator
Calculate area for rectangles, squares, circles, and triangles in square feet.
Result
Enter values and calculate.
How this calculator works
Choose a shape and enter its dimensions in feet. The tool applies the standard area formula and also converts the result to square meters and acres.
Worked example
A 12 ft by 10 ft rectangle has an area of 120 square feet, about 11.15 square meters.
Frequently asked questions
How do I measure an irregular room?
Split it into simple rectangles or triangles, calculate each area, and add the results.
How many square feet are in an acre?
One acre contains exactly 43,560 square feet.
Can I enter decimal dimensions?
Yes. Use decimal feet, such as 10.5 for ten feet six inches.