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Trapezoid Calculator

Use our free trapezoid calculator to find the area of a trapezoid. Enter the lengths of the two parallel bases and the perpendicular height.

Math

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Base A (a)

Base B (b)

Height (h)

Formula

A trapezoid (or trapezium) is a quadrilateral with at least one pair of parallel sides, called bases. The area is computed using the formula A = ½ × (a + b) × h, where a and b are the lengths of the parallel bases and h is the perpendicular height.

A = ½ × (a + b) × h

Percentage: The percentage value you want to apply

Number: The original number or value

Result: The calculated result

How It Works

1Enter the lengths of Base A and Base B (parallel sides).
2Enter the perpendicular height.
3Click Calculate to get the area.
4Add the two bases, divide by 2, and multiply by the height.

Examples

Trapezoid with bases 8 and 5, height 4

1.Enter baseA = 8, baseB = 5, height = 4.
2.Average of bases = (8+5)/2 = 6.5.
3.Area = 6.5 × 4 = 26 units².

Result: 26.0000 units²

Trapezoid with bases 12 and 8, height 6

1.Enter baseA = 12, baseB = 8, height = 6.
2.Average of bases = (12+8)/2 = 10.
3.Area = 10 × 6 = 60 units².

Result: 60.0000 units²

Frequently Asked Questions

Area = ½ × (a + b) × h, where a and b are the lengths of the parallel sides (bases) and h is the perpendicular height.

The bases are the two parallel sides of the trapezoid.

These terms vary by region. In US English, a trapezoid has at least one pair of parallel sides; in UK English, it is called a trapezium.

No. The height is always the perpendicular distance between the two parallel bases.

Not necessarily. The height is the perpendicular distance between the bases. It may be shorter than the legs.

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CalculateMe Team

Last updated: 2026-07-13

Trapezoid Area Calculator - Find Area of a Trapezium | CalculateMe | CalculateMe