Area Calculator

Calculate the area of rectangles, circles, triangles and trapezoids in square feet, square metres and more.

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How to Use This Calculator

How to Use

  1. Choose metric or imperial units.
  2. Select the shape you want to measure.
  3. Enter the dimensions and read off the area in several units.

Formulas

  • Rectangle / square: length × width
  • Circle: π × radius² (radius = diameter ÷ 2)
  • Triangle: ½ × base × height
  • Trapezoid: ½ × (side A + side B) × height

Common Questions

How do I calculate the area of an irregular space?

Split the space into simple shapes (rectangles, triangles), calculate each area separately, then add them together.

How many square feet are in a square metre?

One square metre equals about 10.764 square feet.

How big is an acre?

An acre is 43,560 square feet, or about 4,047 square metres.

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