CDConvertibleData
Geometry calculator

Triangle Area Calculator

Calculate triangle area from a perpendicular base and height.

✓ Tested formula✓ Instant result✓ Private by design
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Enter your valuesResults update instantly as you type.

✓ Your numbers stay on this device.

Understand the answer

Formula and method

FormulaArea = base × perpendicular height ÷ 2.

A triangle occupies half the area of a rectangle with the same base and perpendicular height.

Worked example

Base 12 and height 7 gives area 42.

How to use this calculator

  1. Enter the values using the labels and units shown.
  2. Review the live result and supporting details.
  3. Check the formula, example and assumptions before using the answer.

Assumptions and limits

  • Height is perpendicular to the selected base.

Reference

Formula reviewed 2026-07-15

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