Name the shape
Choose the ideal geometry that matches the measured surface before entering numbers.
Eight shapes · exact unit factors
Calculate the surface the formula actually describes.
AreaCalc pairs each common shape with the dimensions it needs, keeps rational arithmetic exact, and separates symbolic π from its decimal approximation. Measurements never leave the browser.
No account, upload, map, camera, drawing, material estimate, or generated result URL.
Three visible choices
Match the shape, measurement, and square unit
Measure the required dimensions
Distinguish radius from diameter, semiaxes from full axes, and perpendicular height from a slanted side.
Square the unit conversion
AreaCalc converts through exact square-metre factors so a length factor is never mistaken for an area factor.
Eight focused formulas
Common flat shapes without material assumptions
- Rectangle and square surfaces.
- Triangle, trapezoid, and parallelogram from perpendicular height.
- Circle, ellipse, and circular sector with exact π coefficients.
- Metric, imperial, hectare, and international-acre output.
Measure, choose, verify
Turn dimensions into an area you can check
Choose the matching shape, keep every length in one input unit, and inspect the formula before using the converted result.