Trapezoid Area Calculator
Calculate area and perimeter of a trapezoid (trapezium).
About this calculator
The Trapezoid Area Calculator on NumberCals is a free, mobile-friendly tool for anyone needing to calculate area and perimeter of a trapezoid (trapezium). Enter your values in the form below and the result is computed instantly — no sign-up, no installation, no waiting.
Formula used
A = ½·(a + b)·h
What you'll need
- Parallel side a (e.g. 10)
- Parallel side b (e.g. 6)
- Perpendicular Height (e.g. 4)
- Slanted side c (for perimeter, optional) (e.g. 5)
- Slanted side d (for perimeter, optional) (e.g. 5)
What you'll get
- Area
- Perimeter (if all sides given)
Formula
A = ½·(a + b)·h
Result
Frequently Asked Questions
Trapezoid vs trapezium? +
Same shape, different names. 'Trapezoid' is North American English; 'trapezium' is British English (with the same meaning).
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