Area Calculator
Calculate the area of a rectangle, circle or triangle.
Result
Results are estimates for general information only and are not professional advice.
Area formulas
Rectangle area is width × height, circle area is π × radius², and triangle area is ½ × base × height. Choose a shape, enter the dimensions and the calculator returns the area instantly.
Frequently Asked Questions
What is the Area Calculator?
Calculate the area of a rectangle, circle or triangle. It runs instantly in your browser and is completely free.
Is the Area Calculator free and does it require signup?
Yes. Every calculator on Calculatis is 100% free with no registration, and the values you enter are never stored.
How accurate is the Area Calculator?
It uses standard, widely-accepted formulas. Results are reliable estimates for general use and are not a substitute for professional advice.