Torus Calculator

A torus is the 3D shape of a donut or ring. It is formed by rotating a circle of radius r around an axis at distance R from the circle\

The calculator uses the standard published formula for torus is the 3d shape of a donut or ring. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: R = distance from the centre of the tube to the centre of the torus. Each step in the calculation is shown so you can verify the result manually.