Area Calculator
Calculate rectangle, square, circle, or triangle area from dimensions and show the result in your selected unit.
Area result
- Shape
- Rectangle
- Unit
- Centimeters (cm)
- Formula
- Area = length x width
On this page
Using the Area Calculator
Select a shape and unit, then enter its dimensions. Rectangles use length and width, squares use one side length, circles use radius, and triangles use base and perpendicular height. Choose Calculate area to see the result in square units.
Area Formulas
- Rectangle: length × width
- Square: side length × side length
- Circle: π × radius2
- Triangle: (base × height) ÷ 2
Enter every dimension in the same unit. The calculator does not convert between units; it applies the selected unit to the result.