Trapezoid Calculator

Length of the longer parallel side.
Length of the shorter parallel side.
Perpendicular distance between the two parallel sides.
Length of the first non-parallel side.
Length of the second non-parallel side.
Math Updated 16 Jun 2026

Trapezoid Calculator is a mathematics calculator that helps you calculate trapezoid values from your input data. The formula used is: Area = (a+b)/2 × h; Perimeter = a+b+leg1+leg2; Median = (a+b)/2. Ensure all inputs share the same unit system (e.g. all metres or all feet) unless the formula converts between units.

Formula

Area = (a+b)/2 × h; Perimeter = a+b+leg1+leg2; Median = (a+b)/2
  • Trapezoid Calculator gives you a fast estimate using your inputs and updates instantly when you change any value.
  • Formula: Area = (a+b)/2 × h; Perimeter = a+b+leg1+leg2; Median = (a+b)/2
  • Input definitions: • Parallel Side a (cm): the numeric parallel side a (cm) used in the calculation • Parallel Side b (cm): the numeric parallel side b (cm) used in the calculation • Height h (cm): the numeric height h (cm) used in the calculation • Leg 1 (cm): the numeric leg 1 (cm) used in the calculation • Leg 2 (cm): the numeric leg 2 (cm) used in the calculation
  • Manual method: write down each input, apply the formula step by step, then compare your manual result with the calculator output.
  • Ensure all inputs share the same unit system (e.g. all metres or all feet) unless the formula converts between units.
  • Results are mathematically exact given the formula and your inputs. Rounding to decimal places may introduce small display differences.
  • Check that all inputs are in the valid range for the formula. Some operations (e.g. square root, division) require non-negative or non-zero values.
  • Practical tip: test a low, medium, and high scenario to understand sensitivity before making decisions.

Example Calculation

Inputs
  • Parallel Side a (cm): 10
  • Parallel Side b (cm): 6
  • Height h (cm): 4
  • Leg 1 (cm): 5
  • Leg 2 (cm): 5

Suppose you enter: Parallel Side a (cm) = 10, Parallel Side b (cm) = 6, Height h (cm) = 4, Leg 1 (cm) = 5, Leg 2 (cm) = 5. The calculator applies the formula (Area = (a+b)/2 × h; Perimeter = a+b+leg1+leg2; Median = (a+b)/2) and shows all output values below. Change any input field to immediately see how the result changes.

Frequently asked questions

What is the Trapezoid?
The Trapezoid Calculator is a mathematics calculator that helps you calculate trapezoid values from your input data. Ensure all inputs share the same unit system (e.g. all metres or all feet) unless the formula converts between units.
When should I use this calculator?
Use this calculator whenever you need a quick, accurate result for trapezoid values from your input data without working through the arithmetic manually.
What units should I enter?
Ensure all inputs share the same unit system (e.g. all metres or all feet) unless the formula converts between units.
How accurate are the results?
Results are mathematically exact given the formula and your inputs. Rounding to decimal places may introduce small display differences.
How do I interpret the result?
Check that all inputs are in the valid range for the formula. Some operations (e.g. square root, division) require non-negative or non-zero values.
How can I verify the calculation manually?
Use the displayed formula and work through the numbers step by step. If your manual result differs slightly, check rounding and unit conversions first.
Can I use this for planning and budgeting?
Yes. Run best-case, expected, and worst-case inputs to compare outcomes and make safer planning decisions.

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