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Area Calculator
Work out the area of seven common two dimensional shapes with the formula shown for each one.
Calculate area
Area: — square units
Formula: —
How to use the Area Calculator
- Choose the shape you want to measure from the list.
- Enter the measurements the shape needs in the input boxes.
- Read the area and the formula that was applied.
Features
- Rectangle, square, triangle and circle
- Trapezoid, parallelogram and ellipse
- Formula shown next to every result
- Runs locally, no uploads
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Frequently Asked Questions
Common questions about the free online area calculator.
The area calculator covers rectangles, squares, triangles, circles, trapezoids,
parallelograms and ellipses.
The area of a circle is pi multiplied by the radius squared, so a radius of 2 gives about
12.566 square units.
Any consistent unit works. If you enter centimetres the answer is in square centimetres, and
feet give square feet.
A triangle uses half of the base multiplied by the height, and the height is measured
perpendicular to that base.
Add the two parallel sides, multiply the total by the height, then halve the result to get
the area.
The formula line displays the exact expression the tool used, so you can follow the
calculation step by step.
No. Every area is calculated locally in your browser and the measurements never leave your
device.
Yes. The calculator is responsive and works in any modern browser on a phone, tablet or
desktop.
Last updated: October 10, 2026