How to Use the Area Calculator

Fill in the fields above and click calculate. All calculations run instantly in your browser — no data is sent anywhere.

Frequently Asked Questions

What shapes are supported?

Square, rectangle, circle, triangle, and trapezoid. Fields update dynamically based on your shape selection.

What units should I use?

Any consistent unit — feet, meters, inches. Result is in the same unit squared. Use the Unit Converter to convert first if needed.

How is circle area calculated?

Using A = πr² where r is the radius. Circumference = 2πr.