⬛ Area Calculator

Area is the amount of 2-dimensional space enclosed by a shape. It is measured in square units (m², cm², ft², etc.). Every flat shape has an area that can be calculated using its dimensions.

The area of a circle is A = π × r², where r is the radius. For example, a circle with radius 5 m has area = π × 25 ≈ 78.54 m².

For irregular shapes you can divide them into smaller regular shapes (rectangles, triangles, etc.), calculate each area, and add them together. Alternatively, use a coordinate-based formula like the Shoelace theorem.

Area uses square units: m², cm², mm², ft², in², yd², km², acres, hectares, etc. To convert, square the linear conversion factor — for example, 1 m = 100 cm, so 1 m² = 10,000 cm².

Heron's formula finds the area of a triangle from its three side lengths a, b, c. First compute s = (a+b+c)/2 (the semi-perimeter). Then Area = √(s(s−a)(s−b)(s−c)). No height measurement is needed.