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Quadrilateral Calculator — Free Online Tool
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Quadrilateral Calculator

Calculate properties of a quadrilateral given 4 side lengths and an angle

Formula: For a quadrilateral with sides $a, b, c, d$ and opposite angle sum $2\alpha = A + C$, Area = $\sqrt{(s-a)(s-b)(s-c)(s-d) - abcd \cos^2(\alpha)}$ where $s = \frac{a+b+c+d}{2}$. Enter side lengths below.
Side Lengths Inputs

Calculation Results

⚠️ For educational purposes only. Verify results with a qualified professional when making important decisions.

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