Surface Area to Volume Ratio

Compare surface area and volume for a sphere, cube, or cylinder.

Last updated: June 2026 | By Patchworkr Team

Radius

Radius is required.

The ratio is area divided by volume. Sphere: 3/r. Cube: 6/s. Cylinder: 2(r + h)/(rh).

Live Results

Enter valid dimensions to see the ratio.

Formulas

Sphere: SA/V = 3/r

Cube: SA/V = 6/s

Cylinder: SA/V = 2(r + h)/(rh)

Example: sphere with r = 5

Surface area: 4pi(5^2) = 100pi about 314.15926536

Volume: 4/3 pi(5^3) = 500pi/3 about 523.5987756

Ratio: 314.15926536 / 523.5987756 about 0.6, which equals 3/5

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