Cadence to Speed Calculator
Find out exactly how fast you are going at a specific RPM (Rotations Per Minute) in any gear combination.
Ride Data
Average cyclist: 60-80. Pro: 90-110.
Calculated Speed
At 90 RPM using a 53/11 gear.
Understanding Bike Speed & Cadence
Many cyclists focus solely on power (watts), but speed is actually a simple mechanical equation. If you know how fast you are pedaling (Cadence) and what gear you are in (Ratio), you can calculate your exact speed without a GPS computer.
The Physics Formula
Speed = Wheel Circumference × Gear Ratio × RPM × 60
*The result is then converted from millimeters/hour to MPH or KM/H.
Why is 90 RPM the gold standard?
You will often hear that 90 RPM is the ideal cadence. This originated from laboratory testing and professional racing data.
- Low Cadence (60 RPM): Requires high force per pedal stroke. This recruits fast-twitch muscle fibers, which fatigue quickly (glycogen depleting).
- High Cadence (90-100 RPM): Requires less force but higher cardiovascular load. This shifts the effort to your heart and lungs, which have better endurance than leg muscles.
Speed at Common Cadences (Road Bike 53/11t)
The 53/11 gear combination is the standard "top gear" for many pro road bikes. Here is how fast you go at different RPMs:
| Cadence (RPM) | Speed (MPH) | Speed (KM/H) | Effort Level |
|---|---|---|---|
| 60 | 21.4 mph | 34.4 km/h | Grinding / Recovery |
| 90 | 32.1 mph | 51.7 km/h | Fast Race Pace |
| 120 | 42.8 mph | 68.9 km/h | Full Sprint |
Related Tools
To get accurate results, ensure you know your Wheel Circumference. If you are riding a fixed gear, you might also want to check our Skid Patch Calculator to save your tires while maintaining speed.