Area Calculator

Calculate the area and perimeter of 2D shapes including squares, rectangles, circles, triangles, and more. Supports acres and hectares.

Result

Fill in the fields above, then press Calculate.

An area calculator computes the area and perimeter of common 2D shapes including squares, rectangles, circles, and triangles, with support for unit conversions to acres and hectares.

Select the 2D shape (e.g. square, rectangle, circle, triangle) from the dropdown. Choose your units (e.g. feet, meters). Enter the dimensions required for that shape (e.g. side length, radius, base and height). Click Calculate to see the area and, where applicable, the perimeter.

Examples

Room Area

A room that is 12ft by 15ft has an area of 180 sq. feet.

Frequently Asked Questions

How many square feet are in an acre?
One acre is exactly 43,560 square feet.
Related Calculators
Volume Calculator
Surface Area Calculator
Circle Calculator
Square Footage Calculator

Quick Tips

  • •Convert units to the same system before entering values.
  • •For irregular shapes, break them into simpler shapes, calculate each area, and sum the results.
  • •Double-check your inputs — small errors in length are squared in area calculations.