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Area of a Trapezoid Calculator.

Calculate trapezoid area from parallel bases and perpendicular height.

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Set your values

Results update as you type.

Area: 26 units²

Area

26.000000units²

Results update automatically as you type.

Use Cases

Geometry homework and exams

Quickly verify your manual calculations for trapezoid area problems in math class or while studying.

Example: Check the area of a trapezoid with bases 8 cm and 5 cm, height 4 cm.

Real-world area estimation

Estimate the area of trapezoidal plots, land, or objects for planning or construction.

Example: Find the area of a garden bed with parallel sides 10 ft and 6 ft, and height 3 ft.

Frequently Asked Questions

How do I calculate the area of a trapezoid?
Enter the lengths of the two parallel bases (Base a and Base b) and the perpendicular height (Height) into the calculator. The area is computed as (Base a + Base b) / 2 × Height.
What units should I use for the bases and height?
You can use any consistent unit (e.g., meters, feet, inches) for Base a, Base b, and Height. The area will be in square units of that same unit (e.g., square meters, square feet).
Can I use this calculator for any trapezoid?
Yes, as long as you know the lengths of the two parallel sides (bases) and the perpendicular distance between them (height). The calculator works for any trapezoid, including right and isosceles trapezoids.

Tips & Common Mistakes

Tips

  • Ensure that the bases are the parallel sides of the trapezoid.
  • The height must be the perpendicular distance between the bases, not the slant height.
  • Use the same unit for all inputs to get the area in square units.
  • Double-check your measurements if the area seems unexpectedly large or small.

Common Mistakes to Avoid

  • Using the non-parallel sides as bases.
  • Entering the slant height instead of the perpendicular height.
  • Mixing units (e.g., meters for bases and centimeters for height) without converting.

Last updated: August 13, 2026