Area calculator.
Calculate the area and perimeter of common shapes with simple dimensions.
Rectangle area96 units²
Perimeter40 units
Helpful guide
Find the area of a shape
Use the area calculator for rectangles, squares, circles, and triangles. Enter the dimensions in any unit and the answer will use that same unit.
How to use it
01
Choose the shape you want to measure.
02
Enter the required dimensions.
03
Read the area and perimeter instantly.
Frequently asked questions
Which shapes are supported?
The calculator supports rectangles, squares, circles, and triangles.
What units can I use?
You can use any consistent unit, such as centimeters, meters, inches, or feet. The result keeps that unit.
Can I calculate a triangle perimeter?
The tool calculates triangle area from base and height. A triangle perimeter requires all three side lengths, which are not entered here.