Bike Cadence Calculator
Calculate cycling cadence in RPM from wheel speed, gear ratio, and crank length.
What Is Bike Cadence?
Bike cadence is how fast you turn the pedals, measured in revolutions per minute (RPM). It connects your pedaling speed to road speed through your gear ratio and wheel size. Most recreational cyclists aim for roughly 60 to 80 RPM, while trained riders often hold 80 to 100 RPM on flat terrain.
How to Calculate Bike Cadence from Speed
The cadence formula used by this calculator is:
cadence = speed / (π × wheel diameter × gear ratio)
Where gear ratio equals chainring teeth divided by cog teeth, and wheel diameter includes tire width when provided. Enter your speed, wheel size, and current gear to see cadence instantly.
Why Cadence Matters for Cycling
Higher cadence at the same speed usually means less force on each pedal stroke, which can reduce muscle fatigue on long rides. Lower cadence with harder gears builds strength but may increase joint stress. Use this tool to find gears that keep you in a comfortable RPM range at your target speed.
Frequently Asked Questions
What is a good average bike cadence?
For most recreational rides, 60 to 80 RPM is a comfortable range. Trained cyclists often pedal 80 to 100 RPM on flats. The best cadence is one you can sustain without strain.
How does gear ratio affect cadence?
A higher gear ratio (bigger chainring or smaller cog) means fewer pedal revolutions for the same wheel speed, so cadence drops. A lower gear ratio raises cadence at the same speed.
What cadence do I get at 30 km/h on a 29 inch wheel with a 36/11 gear?
About 66 RPM. At 30 km/h with a 29 inch wheel and a 36/11 gear ratio, cadence is roughly one revolution per second.
Do I need a cadence sensor to use this calculator?
No. If you know your speed, wheel size, and gear, this tool estimates cadence. A cadence sensor on your bike computer gives live readings while riding.
Should tire width be included in wheel diameter?
Yes for accuracy. Total rolling diameter equals rim size plus twice the tire width. Many riders enter rim size only when tire width is already included in the wheel size label.
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