The surface area of a solid object is a measure of the total area that the surface of an object occupies.

The mathematical definition of surface area in the presence of curved surfaces is considerably more involved than the definition of arc length of one-dimensional curves, or of the surface area for polyhedra (i.e., objects with flat polygonal faces), for which the surface area is the sum of the areas of its faces.

Measured in square units in length.

For typical figures can be calculated using the following tools: