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Watts Per Kilo Calculator — Power-to-Weight Ratio
Calculate your power-to-weight ratio in watts per kilogram.
Add bike weight to the total mass for a system W/kg
How We Calculate This
Power-to-Weight Formula
- W/kg = Power Output (watts) / Body Weight (kg)
This ratio is the single most important metric for climbing performance in cycling. Professional Grand Tour climbers typically sustain 6+ W/kg at threshold.
Frequently Asked Questions
For recreational cyclists, 2-3 W/kg is typical. Club racers are usually 3.5-4.5 W/kg. Professional riders sustain 5-6+ W/kg at threshold.
You can improve W/kg by increasing power through structured training or by reducing body weight, or both. Focus on sustained power improvements through threshold and VO2 max intervals.
On flat terrain, absolute power matters more. On climbs, W/kg is the key metric since you are lifting your own weight against gravity.
Use your FTP (Functional Threshold Power) for the most meaningful comparison. This is the power you can sustain for about one hour.
Related Calculators
Climbing Power Calculator
Calculate the power needed to climb at a given speed and gradient.
Wind Resistance Calculator
Calculate the effect of headwind and tailwind on power requirements.
Normalised Power Calculator
Calculate normalised power from average power and variability index.
Power to Speed Calculator
Estimate cycling speed from power output accounting for all resistances.
Drag Calculator
Calculate aerodynamic drag force at different speeds.
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Last updated: February 2026
All calculations are estimates. Always verify results and consult a professional bike fitter where appropriate.