Bike Cadence and Speed Calculator

About the Bike Cadence and Speed Calculator

The relationship between cadence and speed is one of the most basic cycling calculations. Speed depends on how fast you pedal, what gear you choose, and how large your wheels are.

This calculator works in both directions — enter a target speed to find the required cadence, or enter a cadence to see what speed you can expect. It accounts for wheel size and drivetrain gearing so you can compare setups without treating any one number as a universal target.

Use the output as a planning aid for route selection, gear choice, and training comparisons.

When This Page Helps

This calculator helps you compare cadence, speed, and gearing in a single place. It is useful for route planning, drivetrain setup, and checking whether a chosen gear range matches the terrain you ride.

How to Use the Inputs

1. Choose your calculation mode: Speed from Cadence or Cadence from Speed.
2. Enter your cadence (RPM) or target speed depending on mode.
3. Select your front chainring and rear cog tooth counts.
4. Choose your wheel size from common presets or enter custom circumference.
5. View computed speed or required cadence plus related metrics.
6. Compare results across multiple gear combinations in the table.
7. Use presets to quickly check common riding scenarios.

Example Calculation

Tips & Best Practices

• Keep your natural cadence range in mind when comparing different drivetrains.
• When buying a new cassette, check that your preferred speed/cadence combos are achievable.
• Use the table view to find which gears produce similar speeds.
• For headwind riding, a slightly higher cadence can help you avoid grinding.
• Track your cadence-speed combos over time if you want a simple way to compare rides.
• Hill repeats at a fixed cadence can be a useful drill for learning gear control.

Understanding the Cadence-Speed-Gear Triangle

Every cycling speed is the product of cadence and gear development (gear ratio × wheel circumference). This means there are many cadence-gear combinations that can produce the same speed.

Practical Applications

Road riders use cadence-speed knowledge to select gearing for time trials and steady rides. Triathletes use it to check whether their race-pace targets are realistic. Mountain bikers and commuters can use it to confirm that their easiest gear is low enough for the steepest terrain they ride.

Using the Number

Treat the result as a comparison number for route and gear planning rather than as a judgment of riding quality or fitness.

Frequently Asked Questions

• What cadence do I need for 30 km/h on a road bike?

  It depends on gearing. In a 50/17 gear (2.94 ratio) on 700×25c wheels, you would need about 80 RPM. In a 39/17 gear, you would need a higher cadence.

• How does tire pressure affect the calculation?

  Tire pressure slightly changes the effective rolling circumference — lower pressure creates more tire deformation. The difference is usually small enough that standard circumference values remain useful.

• Is higher cadence always better for speed?

  Not necessarily. Higher cadence at the same gear means more speed, but it also increases cardiovascular demand. The best balance depends on fitness and terrain.

• What cadence do Tour de France riders use?

  Many riders pedal at roughly 90-100 RPM on flat stages, with a wider range on climbs and in sprints. Individual preferences vary.

• How do I calculate cadence without a sensor?

  Count your pedal strokes for 15 seconds and multiply by 4, or use this calculator in reverse by entering your known speed and gearing.

• Does cadence change with fatigue?

  Yes. Cadence often drifts downward on long rides as neuromuscular fatigue accumulates, which is why cadence drills can be useful.