Area Calculator

Formula and method

Rectangle = width × length. Triangle = base × height ÷ 2. Circle = π × radius². Enter dimensions in meters.

Worked example

A 4 m × 5 m rectangle covers 20 m², equivalent to 5 square wah or 0.0125 rai.

Frequently asked question

How do I calculate an irregular area?

Divide it into non-overlapping rectangles, triangles or circles, calculate each part, then add them or subtract cutouts.