Area Calculator
Calculate the area of common shapes.
Updated
Area
Perimeter
Formula Used
Area Formulas
| Shape | Formula |
|---|---|
| Rectangle | A = l × w |
| Circle | A = πr² |
| Triangle | A = ½ × b × h |
| Trapezoid | A = ½(a + b) × h |
| Ellipse | A = πab |
Frequently Asked Questions
How do I calculate the area of an irregular shape?
Break the shape into simple pieces — rectangles, triangles, and circles — calculate each area separately, then add them together.
How do I calculate the area of a circle?
Multiply pi (about 3.14159) by the radius squared: A = πr². A circle with a 5 m radius has an area of about 78.5 m².
How many square feet are in a square metre?
One square metre equals about 10.764 square feet. To convert square feet to square metres, divide by 10.764.
What units should I use for area?
Use the square of whatever length unit you measured in — square metres, square feet, square centimetres, and so on. Just make sure every measurement uses the same unit before calculating.