What is the Heron’s Formula Calculator?
Find the area, perimeter and angles of a triangle from its three sides. These geometry calculators work out area, perimeter, volume and surface area for common shapes. Units are flexible — enter every length in the same unit and the answer comes back in that unit (squared or cubed).
How to use the Heron’s Formula Calculator
- Enter your side a, your side b, your side c.
- Results update automatically as you type; you can also press Calculate.
- Read the output: area, perimeter, angles (a, b, c), triangle type.
- Use the 📊 chart to see the result visually, then copy or share it.
Formula and method
Worked example
With side a = 7, side b = 8, side c = 9, the Heron’s Formula Calculator returns area: 26.83281573; perimeter: 24; angles (a, b, c): 48.19°, 58.41°, 73.40°.
Tips for better results
- Keep all measurements in one unit before calculating.
- Area units are squared (m², ft²) and volume units are cubed (m³, ft³).
- Use our area and volume converters to switch units afterwards.
Frequently asked questions
What does the Heron’s Formula Calculator do?
Find the area, perimeter and angles of a triangle from its three sides.
How is it calculated?
The Heron’s Formula Calculator uses this method: s = (a + b + c) ÷ 2; A = √(s(s − a)(s − b)(s − c)).
Can you show an example?
With side a = 7, side b = 8, side c = 9, the Heron’s Formula Calculator returns area: 26.83281573; perimeter: 24; angles (a, b, c): 48.19°, 58.41°, 73.40°.
Is the Heron’s Formula Calculator accurate?
Yes. It uses standard formulas and exact constants, and the results are verified by our automated test suite. Values are displayed to up to 12 significant digits.
Is this tool free and private?
Yes — the Heron’s Formula Calculator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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