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Geometry Basics

Trapezoid Area Calculator

Use this for four-sided shapes where two sides are parallel, such as tapered areas, panels, or odd project sections.

Last updated: May 2026

Unit system Switch between U.S. customary and metric units. Your choice is remembered on other calculators.

Trapezoid measurements

Enter the two parallel sides as Base A and Base B. Height is the perpendicular distance between them.

Visual guide

Which measurement goes where?

Base A and Base B are the two parallel sides. Height is measured straight between them.

ft
ft
ft

Buying and sizing notes

How to use this estimate

What this includes

  • The required inputs shown on this page
  • common planning assumptions
  • optional advanced adjustments where provided

What it does not include

  • site-specific professional design
  • local code approval
  • manufacturer-specific requirements
  • installation quality

Common mistakes

  • Leaving a required input at the default when your situation is different
  • ignoring product labels or ratings
  • treating the estimate as an exact final answer

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