Bike Gear and Speed Calculator
Find speed from gearing, cadence and wheel size. The result updates as you type, with the working underneath so you can check it.
Your details
Result
Speed
33.4 km/h
20.8 mph
- Gear ratio
- 2.94
- Distance per pedal turn
- 6.19 m
Good to know: speed = ratio × circumference × cadence
About this tool
Formula
speed = ratio × circumference × cadence
Questions people ask
What is gear ratio?
Chainring teeth divided by cog teeth. 50 ÷ 17 ≈ 2.94 means the wheel turns nearly three times per pedal turn.
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How we calculate this
We use the standard published formula or definition for this calculation, and we show the working so you can check it.
Spotted a mistake? Tell us and we'll check it. How we check our calculators