Using the calculator
Enter the values requested above. Calculate area for common rectangles, triangles and circles from entered dimensions.
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Area Calculator
Calculate area for common rectangles, triangles and circles from entered dimensions.
Enter the values for the problem
Enter the numbers, equation values, scores, or dimensions requested by the area tool. Review the supporting outputs to check the result and understand the relationship between the values.
Important: Use the inputs that match your situation. Results are estimates based on the values and assumptions entered.
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How to use this calculator
Reading the result
The result shows the surface area produced by the dimensions and shape entered. Use the displayed unit when planning coverage or materials.
How it is calculated
Area depends on the selected shape. Rectangles use length times width, triangles use one half base times height, and circles use π times radius squared.
Results are estimates based on the values entered. Review the Methodology and Calculator Disclaimer for important limitations.