Torus Calculator
Calculate the volume and surface area of a torus (donut shape) from its major and minor radii.
- Surface area
- 473.741
Formula: V = 2 × π² × R × r²
About Torus Calculator
Torus Calculator is a free online calculator that gives you an instant, accurate result as you type. Calculate the volume and surface area of a torus (donut shape) from its major and minor radii.
The calculation uses the standard formula V = 2 × π² × R × r² and updates live with every change to the inputs. Everything runs client-side in your browser — fast, private, and free to use as often as you like.
A torus is the surface swept by revolving a circle around an axis — R is the distance from the tube center to the center of the torus.
Frequently Asked Questions
Is Torus Calculator free to use?
Yes. Torus Calculator is completely free, with no sign-up, no downloads, and no usage limits. You can use it as many times as you like on any device with a web browser.
How accurate is this calculator?
The calculator applies the standard formula (V = 2 × π² × R × r²) with full floating-point precision and rounds only the displayed result. For most practical purposes the results are exact.
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