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`"Torus"_"(surf. area)" = pi^2( "b" ^2- "a" ^2)`

Enter a value for all fields

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

**(a)**- inner radius of the torus**(b)**- outer radius of the torus

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`

where;

- A = surface area of the torus
- a = inner radius of the torus
- b = outer radius of the torus