Math Calculators
Area Calculator
Calculate the area of common shapes.
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About the Area Calculator
Calculate the area of the most common shapes in one place. Pick a shape — rectangle, triangle, circle, or trapezoid — enter its dimensions, and the calculator returns the area using the right formula. It's a fast helper for geometry, flooring, painting, and landscaping projects.
How to use the Area Calculator
- 01Enter your shape and its dimensions.
- 02Read the result instantly — it recalculates as you type.
- 03Adjust the numbers to model different scenarios.
Frequently asked questions
How do I calculate area?
It depends on the shape: rectangle = length × width, triangle = ½ × base × height, circle = π × radius². This tool applies each formula for you.
What units does it use?
Whatever units you enter — the area comes out in those units squared (e.g. feet in → square feet).