Tubeless Sealant Calculator

The inflated tire is approximated as a torus with minor radius r = W/2 (half the measured tire width) and major radius R = D/2 + W/2 (rim radius plus half the tire width, i.e. the center of the tube).

The torus surface area is A = 4π²Rr. Multiplying by a desired sealant film thickness t gives the coating volume: V = 4π²Rr·t. Converting mm³ to mL gives the final answer.

This is a rough estimate. Actual sealant needs depend on tire porosity, puncture rate, climate, and sealant brand. When in doubt, round up.