What is the Trapezoid Area Calculator?
Find the area of a trapezoid (trapezium) from its parallel sides and height.
Enter parallel side a, parallel side b and height and the Trapezoid Area Calculator returns area. Results update as you type, and nothing you enter leaves your device.
How it is calculated
Area = (a + b) ÷ 2 × height
How to use it
- Enter parallel side a.
- Enter parallel side b.
- Enter height.
- Read area in the results panel. It updates as you type.
- Change any value to compare scenarios, or use Share to send the result as a link.
Worked example
Common questions
What formula does the Trapezoid Area Calculator use?
It uses: Area = (a + b) ÷ 2 × height.
What do I need to use the Trapezoid Area Calculator?
You need parallel side a, parallel side b and height. Sensible starting values are filled in so you can see how it works straight away.
Is the Trapezoid Area Calculator free, and is my data stored?
It is free with no sign-up. The calculation runs in your browser, so the values you enter are not sent to or stored on our server.