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Trapezoid Calculator
Find the area, perimeter and median of a trapezoid from its bases, height and legs.
Trapezoid calculator
Area: —
Perimeter: —
Median: —
Isosceles leg: —
How to use the Trapezoid Calculator
- Enter the length of both parallel bases.
- Add the height, and the legs if you know them.
- Read the area, perimeter and median straight away.
Features
- Area from the two bases and the height
- Perimeter with your own legs or isosceles legs
- Median and isosceles leg length
- Runs locally, nothing is uploaded
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Frequently Asked Questions
Common questions about the free online trapezoid calculator.
Enter both parallel bases and the height. The tool applies the average of the bases times the
height and shows the answer at once.
Area equals the average of the two parallel bases multiplied by the height, written as (a +
b) / 2 x h.
Enter the two bases and the two legs, or leave the leg boxes empty and the tool assumes an
isosceles shape and works them out.
The median is the segment halfway between the two bases. Its length is the average of the
bases, that is (a + b) / 2.
Yes. Type both leg lengths yourself and the perimeter uses your values, so right and scalene
trapezoids work too.
No. All calculations run locally in your browser, so the measurements you type never leave
your device.
Yes. The calculator is fully responsive and works on desktop, tablet and phone screens of any
size.
Yes. The trapezoid calculator is completely free, unlimited and requires no account or
installation.
Last updated: October 10, 2026