Bike gearing calculators
A gear is two tooth counts and a wheel. These calculators turn them into the numbers cyclists compare: how big the gear is, how fast it goes at a cadence, and how far apart the lowest and highest gears of a drivetrain sit.
Calculators in this section
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Bike gear ratio calculator
The size of a bicycle gear in all four common measures.
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Bike cadence and speed calculator
Speed from cadence, and cadence from speed, for one gear.
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Bike gear range calculator
Gear range and end gears of two drivetrains, side by side.
Which calculator do I need?
Do you want to know how big one gear is? Use the bike gear ratio calculator for the ratio, gear inches, development and gain ratio.
Do you want to know how fast a gear goes? Use the bike cadence and speed calculator for the speed at your cadence and the cadence a target speed needs.
Are you choosing between two cranksets or cassettes? Use the bike gear range calculator to compare their range and their lowest and highest gears.