Trapezoid Calculator

Calculate area and perimeter of trapezoids with detailed analysis

Trapezoid Measurements

Enter the dimensions of your trapezoid

Example Trapezoids

Click to load common trapezoid examples

Area + Perimeter

Regular Trapezoid

Isosceles trapezoid with equal sides

Bases: 10 × 6

Height: 4

Sides: 5 × 5

Area + Perimeter

Roof Truss

Common roof truss shape

Bases: 12 × 8

Height: 3

Sides: 4 × 4

Area Only

Garden Bed

Trapezoidal garden bed area calculation

Bases: 15 × 10

Height: 5

Area + Perimeter

Bridge Support

Bridge support structure

Bases: 20 × 14

Height: 8

Sides: 10 × 10

Area Only

Swimming Pool

Trapezoidal swimming pool surface area

Bases: 25 × 15

Height: 12

Trapezoid Formulas

Mathematical formulas used in calculations

Area

A = (b₁ + b₂) × h ÷ 2

Area of trapezoid using parallel bases and height

Variables:

AArea

b₁First parallel base

b₂Second parallel base

hHeight (perpendicular distance between bases)

Perimeter

P = b₁ + b₂ + s₁ + s₂

Perimeter using all four sides

Variables:

PPerimeter

b₁First parallel base

b₂Second parallel base

s₁First non-parallel side

s₂Second non-parallel side

Median (Midsegment)

m = (b₁ + b₂) ÷ 2

Length of the median (line connecting midpoints of non-parallel sides)

Variables:

mMedian length

b₁First parallel base

b₂Second parallel base

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Trapezoid Calculator

Regular Trapezoid

Roof Truss

Garden Bed

Bridge Support

Swimming Pool

Area

Variables:

Perimeter

Variables:

Median (Midsegment)

Variables:

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Trapezoid Calculator

Regular Trapezoid

Roof Truss

Garden Bed

Bridge Support

Swimming Pool

Area

Variables:

Perimeter

Variables:

Median (Midsegment)

Variables: