Area calculator
Calculate the area of common 2D shapes with step-by-step formulas.
This tool processes all data locally on your device.
Input
Output
Formula
A = width × height
Readme
Tool description
The Area Calculator helps you compute the surface of common 2D shapes using guided formulas and instant feedback on input validity.
Features
- Supports rectangle, square, circle, triangle, trapezoid, and ellipse calculations
- Dynamic input form that adjusts to the selected shape
- Automatic formula evaluation with numerical substitution preview
- Copy-ready result field with smart formatting for large and small values
- Helpful tips and validation to ensure the right units and positive dimensions
Supported Shapes
- Rectangle - width × height
- Square - side²
- Circle - π × radius²
- Triangle - ½ × base × height
- Trapezoid - ½ × (base a + base b) × height
- Ellipse - π × semi-major axis × semi-minor axis
Use Cases
- Geometry homework and classroom demonstrations
- Engineering sketches and quick sanity checks
- UX or product design specs that require surface estimates
- Comparing areas when planning layouts or materials
- Verifying results from manual calculations before documentation
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Disclaimer
The tools provided on this website are designed to assist users in solving various problems. While we strive to ensure that the tools are accurate and effective, we do not guarantee or warrant that the output of any tool will be 100% accurate or error-free. The results generated by these tools are provided as-is and should be used with caution. We recommend that users verify any important information or results with additional resources or professional advice, as we cannot be held responsible for any consequences arising from the use of these tools. By using this website, you agree to assume all risks associated with the accuracy and use of the results provided.
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