NumberCals

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

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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