Torus Surface Area Calculator

Calculate the surface area of a torus from its major and minor radii.

Last updated: June 2026 | By Patchworkr Team

Torus Radii

Major Radius

Minor Radius

Major radius is required.

Surface area = 4pi^2 Rr. The major radius must be greater than the minor radius for a standard torus.

Live Results

Enter valid radii to see results.

Formula

Surface area: SA = 4pi^2 Rr

Example: R = 8, r = 2

Surface area: 4pi^2(8)(2) = 64pi^2 about 631.65468167

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