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VolLab
The classic donut shape, from two radii.
A torus needs two measurements: R, the distance from the center hole to the middle of the tube, and r, the radius of the tube itself. Volume = 2π² × R × r².
O-rings, inner tubes, bagels, and the donut-shaped vacuum chambers in fusion reactors (tokamaks) are all toruses — the same formula sizes all of them.
Volume
1,421.223
What you entered
Volume = 2π² × R × r²
2π² × 8 × 3²= 1421.223Surface area = 4π² × R × r
4π² × 8 × 3= 947.482Result
Volume: 1,421.223
A torus (donut shape) with center-to-tube radius 8 and tube radius 3 has a volume of 1,421.223 and a surface area of 947.482.