Area Calculator
Choose a shape, enter dimensions in one consistent unit, and calculate locally.
A QUICK WALKTHROUGH
How to use this tool
- Choose a shape.
- Enter positive dimensions using one unit.
- Review the formula and area.
Supported shapes
Rectangle, square, triangle, circle, and trapezoid.
Units and limits
Use the same length unit for every dimension. Areas are shown in squared units. Irregular polygons and CAD geometry are outside this tool.
GOOD TO KNOW
Common questions
Are my dimensions uploaded?
No. The calculation runs locally in your browser.