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
    1.  
surface area S
    1.  

    Volume of a torus
    [1-10] /56Disp-Num
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    [1]  2018/11/27 17:14   Male / 60 years old level or over / Self-employed people / Very /
    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
    [2]  2018/11/16 03:54   Male / 50 years old level / An engineer / Very /
    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
    [3]  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.
    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.
    [4]  2018/09/24 10:25   Female / Under 20 years old / High-school/ University/ Grad student / Useful /
    Purpose of use
    physics experiment
    [5]  2018/09/22 03:58   Female / Under 20 years old / High-school/ University/ Grad student / A little /
    Purpose of use
    Checking a derived equation
    [6]  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
    [7]  2018/07/30 16:19   Male / 60 years old level or over / A teacher / A researcher / Useful /
    Purpose of use
    to determine required depth of fitment for an O ring
    [8]  2018/07/13 23:26   Female / 20 years old level / An engineer / Useful /
    Purpose of use
    calculating the volume of the elbow of a pipe
    [9]  2018/05/30 08:28   Male / 40 years old level / Others / Very /
    Purpose of use
    Designing an anchor for a floating trampoline.
    [10]  2018/05/29 07:50   Female / Under 20 years old / High-school/ University/ Grad student / Very /
    Purpose of use
    A project for my AP calculus class

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