# Volume of a torus Calculator

## Calculates the volume and surface area of a torus given the inner and outer radii. | ||

- Purpose of use
- determine volume of o-ring
- Comment/Request
- thanks

- Purpose of use
- Calculating how long it might take to manually pump up one of the new 26 x 4 inch "fat tires" on an MTB.

- Purpose of use
- Volume of o ring.
- Comment/Request
- Enhancement suggestion. Calculating volume of O ring sold as 13.95 inside diameter and 2.62mm thickness required use of another calculator before use of torus calculator. 15mm by 2mm O ring can be done in my head before using Torus calculator

- Purpose of use
- As a demonstration tool
- Comment/Request
- Since o-rings are typically specified (& sold) by inside diameter and the cross section this would be a very useful (& time saving) option

- Purpose of use
- Checked against what I guessed would be the volume of a torus. My equation was longer, but this was the simpler version.

I guessed it was the radius of the torus, times the average of the circumferences.

Pi*[(b-a)/2]^2*[(2*Pi*b)+(2*Pi*a)/2]

Turns out I was right, and after factoring it out, I reduced it to the same equation. - Comment/Request
- It's great. A note explaining that it is similar to calculating a cylinder, and that you are averaging the circumference to get the "length" would be nice.

- Purpose of use
- physics experiment

- Purpose of use
- Checking a derived equation

- Purpose of use
- calculate the volume of an inner tube to estimate buoyancy and weight carrying capacity on water

- Purpose of use
- to determine required depth of fitment for an O ring

- Purpose of use
- calculating the volume of the elbow of a pipe

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**The hyperlink to [Volume of a torus]**