Math
Area Calculator
Calculate area for common two-dimensional shapes.
Area Calculator result
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40 m²Area formula: length × width
All dimensions must use the selected unit. The result is labeled in square units; this tool does not mix or silently convert dimension units.
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How this tool works
The selected shape determines the formula—for example length × width for a rectangle or πr² for a circle—and the result retains the squared unit.
Limits to know
Results assume ideal geometric shapes and use the entered unit consistently. Irregular boundaries, slopes, thickness, measurement uncertainty, and mixed units require decomposition or conversion before use.