Area Calculator
Calculate the area of a rectangle, circle, or triangle. Results shown in m², km², hectares, and acres.
100% client-side · no upload
Square metres (m²)
Square kilometres (km²)
Hectares (ha)
Acres
How to use
- Select a shape (rectangle, circle, or triangle) from the dropdown.
- Enter the required dimensions in metres (width/height, radius, or base/height).
- Click Calculate Area to see results in m², km², hectares, and acres.
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常見問題
- Is this area calculator free?
- Yes, completely free with no signup and no usage limits.
- Does my data leave my device?
- No. All calculations run in JavaScript inside your browser. No data is sent to any server.
- Does it work on mobile?
- Yes. The calculator is mobile-first and works on iPhone Safari and Android Chrome.