The Torus Surface Area calculator computes the surface area of a torus (circular tube) with a major radius of (R) and a minor radius of (r).
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 = 4 • π² • R • r
where;