The Surface Area of a Torus calculator computes the surface area of a torus (circular tube) based on an inner radius of (a) and an outer radius of (b).
INSTRUCTIONS: Choose units and enter the following
Torus Surface Area (A): The calculator returns the surface area in square meters. However, this can be automatically converted to compatible units via the pull-down menu.
The formula for the surface area of a torus is:
`A = pi^2 * (b-a)^2`