Cycling Speed Calculator

Calculate your cycling speed from power output

Power and Conditions

Unit System

Power Output (Watts)

Rider Weight (kg)

Bike Weight (kg)

Gradient (%)

Headwind

Position

Surface

Speed

33.3 km/h

Speed

20.7 mph

Power to Weight

2.67 W/kg

10 km18m 0s

20 km36m 1s

40 km TT1h 12m

100 km3h 0m

Century (100mi)4h 49m

150W29.9 km/h18.6 mph

200W33.3 km/h20.7 mph

250W36.2 km/h22.5 mph

300W38.6 km/h24.0 mph

350W40.8 km/h25.4 mph

400W42.8 km/h26.6 mph

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MyCalcBuddy Editorial Team

This page is maintained as an educational calculator reference.

ðŸ“š

Formula Source: Standard Mathematical References

by Various

ðŸ”„Last reviewed: May 2026

âœ“Formula checks are based on standard references and internal QA review.