CalculateMeasure

Math & Geometry

Heron's Formula Calculator

Calculate the area of a triangle from all three side lengths using Heron’s formula.

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Calculator guide

How to use the Heron's Formula Calculator

Calculate the area of a triangle from all three side lengths using Heron’s formula. Enter the requested values and select Calculate. The result and supporting values are produced locally in your browser.

Formula

s = (a + b + c) ÷ 2; Area = √[s(s − a)(s − b)(s − c)]

Worked example

A triangle with sides 5, 6, and 7 has an area of about 14.697 square units.

What to keep in mind

  • All three side lengths must be expressed in the same unit.

Methodology

This calculator uses deterministic arithmetic and performs the calculation locally in your browser. Verify assumptions, units, and source values for your specific use case.

Review standard: Level A · Standard formula. How calculator reviews work.

Frequently asked questions

What does this calculator calculate?

Calculate the area of a triangle from all three side lengths using Heron’s formula.

How is the result calculated?

s = (a + b + c) ÷ 2; Area = √[s(s − a)(s − b)(s − c)].

Can I use the result for an important decision?

Use the result as a calculation aid and verify the inputs, assumptions, and applicable professional or regulatory requirements before relying on it for an important decision.

Does CalculateMeasure store the values I enter?

The calculator performs its arithmetic in your browser. The calculator itself does not need to send your entered values to a server to produce the result.