Torus Volume Calculator
Calculate volume and surface area of a torus (doughnut shape).
About this calculator
The Torus Volume Calculator on NumberCals is a free, mobile-friendly tool for anyone needing to calculate volume and surface area of a torus (doughnut shape). Enter your values in the form below and the result is computed instantly — no sign-up, no installation, no waiting.
Formula used
V = 2π²·R·r²; SA = 4π²·R·r
What you'll need
- Major Radius (R, centre of tube to centre of torus) (e.g. 5)
- Minor Radius (r, tube radius) (e.g. 2)
What you'll get
- Volume
- Surface Area
Formula
V = 2π²·R·r²; SA = 4π²·R·r
Result
Frequently Asked Questions
R vs r? +
R is the distance from the centre of the torus to the centre of the tube. r is the radius of the tube itself. R must be ≥ r for a valid torus.
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