About the Cycling Cadence
The Cycling Cadence Calculator works out how fast you would need to pedal, in revolutions per minute, to hold a target speed in a specific gear. It pairs directly with a gear's 'development' figure, the distance the bike travels per pedal revolution, to answer a practical gearing question before you are out on the road.
How It Works
You enter a target speed in mph and the gear's development in meters, the distance covered by one full pedal revolution in that gear, available from the site's Gear Ratio & Development calculator. The calculator converts your speed into meters traveled per minute, then divides that by the development figure to get the required cadence in rpm.
Formula & Methodology
Speed in mph is first converted to meters per minute by multiplying by 1609.34, the number of meters in a mile, and dividing by 60 minutes per hour. That figure represents how far the bike needs to travel every minute. Dividing it by development, the distance covered per pedal revolution in the chosen gear, gives the number of pedal revolutions needed each minute to sustain that speed.
Examples
Flat Road Gearing
At 20 mph in a gear with 7.5m of development, speed converts to (20 x 1609.34) / 60 = 536.45 meters per minute, giving a required cadence of 536.45 / 7.5 = 72 rpm.
Faster Gear
At 25 mph in a gear with 8.5m of development, speed converts to (25 x 1609.34) / 60 = 670.56 meters per minute, giving a required cadence of 670.56 / 8.5 = 79 rpm.
Advantages
- Turns a target speed into a concrete rpm figure instead of leaving gear selection to trial and error.
- Works alongside the Gear Ratio & Development calculator for a complete gearing workflow, from chainring and cog to actual pedaling rpm.
- Useful for planning cadence-based interval workouts by working backward from a goal speed.
Common Mistakes
- Entering chainring or cog teeth counts directly instead of the already-computed development distance the formula actually requires.
- Mixing units, such as entering development in inches or centimeters when the formula expects meters.
- Expecting the calculated cadence to match real-world riding exactly, when terrain, wind, and drivetrain losses cause some variation.
Edge Cases to Watch For
- Gear development must be greater than zero, otherwise the calculator returns an error instead of a cadence figure.
- Development is not something you measure directly off the bike; it needs to be calculated first from chainring teeth, rear cog teeth, and wheel diameter using a separate gear ratio calculation.
- The formula assumes an idealized, slip-free relationship between wheel rotation and pedal rotation, so real-world cadence can differ slightly due to drivetrain losses or terrain.
Common Use Cases
- Cyclists choosing gearing in advance for a known course or climb.
- Coaches setting cadence-based interval targets from a goal speed.
- Indoor trainer users translating a gear setup into a target rpm for structured workouts.