Area and midsegment
Area uses A = (base1 + base2) × height / 2. The midsegment is the average of the parallel bases, so m = (base1 + base2) / 2.
Calculators / Quick tool
Trapezoid Calculator
Calculate trapezoid area, solve height, or find perimeter and midsegment from the measurements you know.
● Processed locally in your browser
How to useHow to use Trapezoid Calculator ⌄
Calculate trapezoid area, solve height, or find perimeter and midsegment from the measurements you know.
- 1
Paste content, enter parameters or choose the files you need in “Named trapezoid measurements”.
- 2
Choose “Calculate area”, “Solve height”, “Calculate perimeter” for the job. Processing runs in this browser.
- 3
Review the result under “Trapezoid measurements and formula”, then copy or download it after checking the output.
Result guide
What Trapezoid Calculator calculates
Choose the measurement you need: area from two parallel bases and perpendicular height, height from area and the two bases, or perimeter from both bases and both legs. Each result includes its formula and current substitution.
Solve the missing height
When area and both parallel bases are known, rearrange the same formula to height = 2 × area / (base1 + base2). Height means the perpendicular distance, not a slanted leg.
Units and perimeter limits
Use one consistent length unit for every side. Area is in the corresponding square unit. Perimeter needs both bases and both legs; bases plus height alone are not enough to determine it for a general trapezoid.
Frequently asked questions
What is the trapezoid area formula?
A = (a + b)h/2, where a and b are the parallel bases and h is their perpendicular distance.
Can I find perimeter from the two bases and height?
Not for a general trapezoid. Different leg lengths can produce the same bases and height, so both legs are required for this perimeter calculation.
Does the calculator convert units?
No. Enter every length in one shared unit. The numeric result keeps that unit, and area uses its square.
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