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Sports • Cycling Cadence, Gearing & Watts

Cycling Cadence, Gearing & Watts

Calculate gear ratios, speed at cadence, aerodynamic power in Watts, chain length, and e-bike battery range.

Cycling Dynamics & Aerodynamics

Cycling Speed, Power Watts & Gear Engineering

Calculated Speed
37.9 km/h
23.5 mph
Cycling Pace
1:35
Minutes per kilometer
Gear Ratio
3.33 : 1
7.02m per crank turn
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Calculation Guide & Reference

Cycling Gear Ratio & Speed Mathematics

Cycling speed calculator computes your speed from cadence and gear ratio, plus gear inches and meters of development for any chainring/cog combination.

Standardized Mathematical Formula
Speed (km/h) = Cadence × Gear Ratio × Wheel Circumference × 60 ÷ 1,000,000

Gear ratio is the chainring teeth divided by the rear cog teeth. Each pedal revolution turns the wheel by that ratio, and multiplying by cadence (pedal RPM) and wheel circumference gives ground speed.

Variables:
Cadence:Pedaling rate in revolutions per minute (RPM)
Gear Ratio:Chainring teeth ÷ rear cog teeth
Wheel Circumference:Distance the wheel travels per revolution (mm)
How It Works (Step-by-Step)
  • 1Enter the chainring and rear cog tooth counts, pedal cadence, and wheel circumference.
  • 2View your resulting speed, pace, and gear ratio.
Real-World Numerical Example
50T Chainring, 15T Cog at 90 RPM

A cyclist rides a 50-tooth chainring paired with a 15-tooth rear cog, pedaling at 90 RPM on a standard 700×25c wheel (2,105 mm circumference).

•Gear ratio: 50 ÷ 15 = 3.33.
•Speed: 90 × 3.33 × (2,105 ÷ 1,000) × 60 ÷ 1,000 = 37.89 km/h.
•In mph: 37.89 × 0.621371 ≈ 23.55 mph.
Result: At this gear and cadence, the cyclist travels approximately 37.89 km/h (23.55 mph).
Calculation Best Practices & Tips
Use the Brzycki formula (1RM = Weight / (1.0278 - 0.0278 * Reps)) for sub-maximal sets between 2 and 10 repetitions.
Pace consistency during the first half of a marathon is the single greatest predictor of achieving personal record finish times.

Frequently Asked Questions (FAQ)

Speed = Cadence (RPM) × Gear Ratio × Wheel Circumference × 60, converted to km/h. Gear ratio is chainring teeth ÷ rear cog teeth.

Most competitive cyclists pedal between 85-95 RPM on flat terrain, which balances muscular force against cardiovascular efficiency better than very low or very high cadences.

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