Square Meters Calculator
Find an area in square meters for a rectangle, square, circle or triangle, with an optional border, quantity and price.
Change the values and press Calculate to work out your own figures.
Rectangle
Enter the rectangle's sizes.
Show the working
- area = length × width
Square
Enter the square's sizes.
Show the working
- area = side²
Circle
Enter the circle's sizes.
Show the working
- area = π × (diameter ÷ 2)²
Triangle
Enter the triangle's sizes.
Show the working
- Heron's formula: area = √(s(s − a)(s − b)(s − c)), s = half the perimeter
How to use it
Enter the rectangle's sizes. Enter the square's sizes. Enter the circle's sizes. Enter the triangle's sizes.
Lengths can be decimals, fractions or tape entries such as 12' 6 1/2" (in feet or inches). Prices are optional.
Key facts
rectangle = length × width; circle = π r²; triangle (Heron) = √(s(s − a)(s − b)(s − c))
Units
A square yard is 9 square feet, a square foot 144 square inches, and a square meter about 10.764 square feet.
Questions
How many square meters is 10 × 10 m?
100 m².
How many square feet in a square meter?
About 10.764.
Formulas
rectangle = length × width; circle = π r²; triangle (Heron) = √(s(s − a)(s − b)(s − c))
Sources
Limitations
- Material densities are typical values (the midpoint of the commonly published range); real loads vary with moisture, grading and compaction, so check with your supplier or type in their density.
- Tank results are the geometric volume; real tanks have wall thickness and fittings.