About the Area Calculator
Find the area of a rectangle, triangle, circle or parallelogram. This tool is free, works in your browser and needs no sign-up.
How to use the Area Calculator
Pick a shape and enter the values A and B as described in the shape name.
Formula used
Rectangle = A × B. Triangle = A × B ÷ 2. Circle = π × A². Parallelogram = A × B.
Example
A rectangle that is 5 by 3 has an area of 15.
Frequently asked questions
Is the Area Calculator free to use?
Yes. It is completely free and you can use it as many times as you like.
How accurate is the Area Calculator?
The calculator uses standard formulas, so the maths is exact. Real life results can differ because of fees, taxes, rounding or personal factors, so treat the answer as an estimate.
Do you store the numbers I enter?
No. All calculations run in your browser. The values you type are not sent to our server.
Disclaimer: results are estimates for information only. They are not financial, medical or professional advice.