Trapezoid Perimeter Calculator
Find the perimeter of a trapezoid from its four side lengths, plus optional area, free in your browser with this easy trapezoid perimeter calculator.
Enter Values
Shape
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How to use this calculator
- Enter the four sides.
- Press Calculate.
How it works
Perimeter = the sum of all four sides.
Worked example
4, 6, 3, 3 m. = 16 m.
Common mistakes
- Forgetting one of the slanted sides — a trapezoid has four sides to add.
- Confusing perimeter with area, which uses the parallel sides and the height.
Frequently asked questions
How do I find a trapezoid's perimeter?
Add all four sides: the two parallel sides plus the two legs. The tool sums them for you.
What is a trapezoid?
A four-sided shape with at least one pair of parallel sides; the parallel sides are the bases and the others are the legs.
How is this different from the trapezoid area calculator?
Perimeter adds all four side lengths; area needs the two parallel sides and the perpendicular height between them.
Related tools
- Trapezoid Area Calculator
- Triangle Perimeter Calculator
- Rectangle Perimeter Calculator
- Regular Hexagon Area Calculator
- Regular Pentagon Area Calculator
- Regular Polygon Area Calculator
Explore more in Geometry, Shape, Area & Volume.
Cite this tool
Zerdly. (2026). Trapezoid Perimeter Calculator. Retrieved from https://www.zerdly.com/tools/trapezoid-perimeter-calculator/
Tip: Enter any known values to calculate the remaining results.
Designed to run locally in your browser. Tool inputs are not intentionally stored by Zerdly unless stated otherwise.