Volume of a torus Calculator

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

Volume of a torus
inner radius a
outer radius b
    1. b≧a

volume V
surface area S
    Volume of a torus
    [1-10] /60Disp-Num
    [1]  2019/12/22 03:44   Male / 60 years old level or over / An engineer / Useful /
    Purpose of use
    comparison of internal volumes of BMX tires, assumed to track elastic properties
    [2]  2019/10/08 03:40   Male / Under 20 years old / High-school/ University/ Grad student / Very /
    Purpose of use
    Decided to draw isometric sketches of shapes from online pages and the input units to find various calculations. This was all done out of boredom and I enjoy it.
    I had no idea that this site existed and am going to recommend this to others. Personally, I love looking at formulas as well. All I ask is the addition of a truncated torus and partial torus. what I mean is page for a torus but the cylinder that makes it up is like the cylinder on the "volume of a partial right cylinder" page, and another page for a torus but its cylinder does not wrap around all the way. The second one could just be "(torus formula) divided by degree of angle" or something like that, but I just would like to make sure. Thanks for the knowledge though!
    [3]  2019/08/30 02:38   Male / 30 years old level / An engineer / Very /
    Purpose of use
    determine volume of o-ring
    [4]  2019/06/14 06:34   Male / 60 years old level or over / A retired person / Very /
    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.
    [5]  2018/11/27 17:14   Male / 60 years old level or over / Self-employed people / Very /
    Purpose of use
    Volume of o ring.
    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
    [6]  2018/11/16 03:54   Male / 50 years old level / An engineer / Very /
    Purpose of use
    As a demonstration tool
    Since o-rings are typically specified (& sold) by inside diameter and the cross section this would be a very useful (& time saving) option
    [7]  2018/10/02 06:19   Male / 30 years old level / An office worker / A public employee / Very /
    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.

    Turns out I was right, and after factoring it out, I reduced it to the same equation.
    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.
    [8]  2018/09/24 10:25   Female / Under 20 years old / High-school/ University/ Grad student / Useful /
    Purpose of use
    physics experiment
    [9]  2018/09/22 03:58   Female / Under 20 years old / High-school/ University/ Grad student / A little /
    Purpose of use
    Checking a derived equation
    [10]  2018/08/05 14:43   Male / 50 years old level / A teacher / A researcher / Very /
    Purpose of use
    calculate the volume of an inner tube to estimate buoyancy and weight carrying capacity on water


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