Area Calculator

The area of a surface is the space occupied by a geometrical figure (whether an object is flat or two-dimensional).

Use these area calculators to calculate the area of geometrical figures like Triangle, Circle, Rectangle and Sphere.

Area of a Triangle

Area of a Triangle Formula:

A= ½bh

where, b - the base of the triangle, h - the height of the triangle.

Area of a Rectangle

Area of a Rectangle Formula:

A= l · w

where, l - length of a rectangle, w - width of a rectangle.

Area of a Circle

Area of a Circle Formula:

A= Π r2

where, r - radius of circle, Π = 3.142 (fixed value)

Alternate formula for the area is, A = Π · d2/4, where d - the diameter of a circle.

Surface Area of a Sphere

Surface Area of a Sphere Formula:

A = 4Πr2

where, r - radius of circle, Π = 3.142 (fixed value)

More Calculators