CalculatorsTubeless Sealant Calculator

Tubeless Sealant Calculator

Sealant has to coat the casing. A 28 mm road tyre needs far less than a 2.4 inch trail tyre. Refresh it when it dries, not only when you first mount the tyre.

Inputs

Tire width (mm)Wheel diameter

Results

Sealant: 46 ml

How the number is made

Millilitres = tyre width × (bead-seat diameter ÷ 622) × factor. Factor is 1.65 at 45 mm and under, 2.05 above that. 622 mm is a 700c / 29-inch bead seat.

Inserts and very porous casings drink the first fill. Add a splash if the tyre was stored dry.

Related calculators

Tire Pressure Calculator
Seat the bead at a safe pressure after the sealant is in.
Rim and Tire ETRTO Checker
Sealant will not make a too-narrow tyre safe on a wide rim.

Questions

How often do I refill?

Every few months in a hot climate, longer if the tyre stays wet inside. This calculator is the fill volume, not the calendar.

Does width mean the label or the mounted tyre?

Use the labelled width. A mounted tyre on a wide rim can be a millimetre or two different.

Can I enter a 630 mm bead diameter?

No. The volume factor is defined only for 559, 584 and 622. Any other bead diameter is rejected.

Related gear

Tubeless sealant
A bottle with millilitre marks beats guessing from the valve stem.
$10–$30

Disclaimer — no professional advice, no liability

These calculators are simplified estimates for education. They are not a bike fit, a structural inspection, or a torque specification that overrides the number printed on a part. Confirm chain length, spoke length, tire fit and bolt torque on the bicycle before you ride.

These calculators, pages and any related content are provided “as is” and “as available”, solely for general educational and informational purposes. They are simplified mathematical estimates, not a professional bike fit, a structural inspection, a manufacturer torque specification or a training, nutrition or medical plan.

Results can be wrong, incomplete or inapplicable to your frame, wheels, tires, drivetrain or suspension. You must independently verify every figure, assume all risk, and confirm chain length before you cut, spoke length before you lace, tire and rim compatibility before you inflate, and the torque printed on the part before you tighten it.

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