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Health & Fitness

Cycling Speed Calculator

Calculate cycling speed from gearing (chainring, cog, wheel size) and cadence, or average speed from distance and time.

Your inputs

700×25c ≈ 2105 mm; 29″ MTB ≈ 2300 mm.

Results

Speed

37.89 km/h

Speed
23.54 mph
Gear ratio
3.333
Distance per pedal turn
7.02 m

✓Exact calculation — rounded only for display

Inputs are never added to links for financial, salary or health calculators.

What this calculator does

Speed on a bike is set by gear ratio, wheel circumference and how fast you pedal.

Formula and method

Speed = (chainring ÷ cog) × wheel circumference × cadence × 60

Worked example

Calculated by this tool with its default inputs:

Inputs

  • Calculate from: Gearing and cadence
  • Chainring teeth: 50
  • Rear cog teeth: 15
  • Wheel circumference: 2105 mm
  • Cadence: 90 rpm

Results

  • Speed: 37.89 km/h
  • Speed: 23.54 mph
  • Gear ratio: 3.333
  • Distance per pedal turn: 7.02 m

How to read the results

“Distance per pedal turn” (development) helps compare gears across bikes.

Assumptions and limitations

  • Tyre pressure and size change the real circumference slightly.

Health results are general estimates for adults and do not replace medical advice, diagnosis or treatment. Speak to a qualified health professional about your personal situation, especially during pregnancy or if you have a medical condition.

Questions

What wheel circumference should I use?

Check your tyre size chart or measure one wheel revolution on the ground.

Methodology and verification

Result type
Exact mathematical calculation (rounded only for display)
Formula version
1.0
Automated verification
3 reference and validation test cases, checked against independently computed values. The site cannot be built if any of them fail.
Editorial review
Awaiting human editorial review. The explanation was drafted with AI assistance; the formula and examples are verified by the automated tests above.

Privacy

Everything you enter is calculated in this browser and is not sent to Numerith or anyone else. Because this calculator can involve personal financial or health details, your inputs are never added to share links or saved to history. Privacy policy