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    Area & Drawings

    Heron Triangle Area Calculator

    Calculate triangle area and perimeter from the lengths of all three sides. All side lengths must form a nondegenerate triangle and share the same unit. This browser-local calculator updates from numeric inputs and shows a labelled breakdown without uploading your data.

    MAKE IT SIMPLE
    Calculation assumptions

    All side lengths must form a nondegenerate triangle and share the same unit.

    Result

    Worked examples

    Side A (m) 3 · Side B (m) 4 · Side C (m) 5

    First calculated quantity: 6.00000 m²

    Calculate triangle area and perimeter from the lengths of all three sides. All side lengths must form a nondegenerate triangle and share the same unit.

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