CalculatorsPower-to-Weight Calculator
Power-to-Weight Calculator
W/kg is the climbing currency. Enter the watts you can hold and your body weight. The bike weight does not go in the denominator — that is the convention for rider W/kg.
Inputs
Results
- Power to weight
- 3.57 W/kg
The Result is indicative and educational. It does not constitute a design, a technical opinion or medical advice and does not replace calculations or verification by a person with the appropriate qualifications and authorisations. Before purchase, installation or use in practice – in particular in electrical installations – the Result should be verified by a qualified specialist. Details: Terms of Service, point 4.
How the number is made
W/kg = watts ÷ body mass in kilograms. A 250 W rider at 70 kg is 3.57 W/kg.
Compare like with like: a 20-minute W/kg is not a 5-second sprint W/kg. Weigh yourself the same way each time, with or without kit.
Related calculators
- Climbing VAM Calculator
VAM turns the same watts into metres of elevation per hour.
- Speed to Watts Calculator
On the flat, drag matters more than W/kg.
Questions
Does the bike count?
Not in rider W/kg. It does count when you estimate climbing speed, because gravity lifts the whole system.
What is a strong club figure?
Many fit club riders sit between 3 and 4 W/kg for a sustained effort. The calculator does not hand out categories.
Which watts should I enter?
For climbing, your FTP: the power you can hold for about an hour. A common estimate is 95% of a 20-minute all-out average. Sprint W/kg is a separate number, so compare sprints only with sprints.
Example products
Product links are Affiliate Links to Amazon websites. Using them does not cost you anything extra, and if you make a purchase we may receive a commission. Details: Terms of Service, point 5.
- Power meter
W/kg without a measured watt is a guess. Pedals or a crank spider both work.
$300–$1000