Power-to-Weight Ratio Calculator
Calculate your watts per kilogram (W/kg) — the number that best predicts climbing and racing performance.
How to use the power-to-weight calculator
- Enter your FTP (or any power figure) in watts.
- Enter your body weight and choose the unit.
- Click Calculate to get your W/kg and category ranking.
Raising your W/kg
There are only two levers: increase sustainable power through structured training, or reduce non-functional body mass. Most riders improve fastest by raising FTP while maintaining a healthy, fuelled weight rather than over-restricting.
Why W/kg decides climbing performance
On a climb you must lift your entire body and bike against gravity, so power relative to weight, not raw watts, determines how fast you ascend. This is why a lighter rider with modest absolute power can drop a more powerful but heavier rider on a steep gradient.
On the flat, raw watts matter more because you are fighting air resistance rather than gravity, which is why heavier riders often excel in time trials and sprints.
Two levers for raising your W/kg
You can increase sustainable power through structured training or reduce non-functional body mass. Most riders improve fastest by raising FTP while fuelling properly, rather than under-eating to lose weight, which tends to sap training quality and erode the very power they are trying to express.
Frequently asked questions
What is a good power-to-weight ratio?
Around 2–3 W/kg is recreational, 3–4 is a strong club rider, 4–5 is a competitive amateur, and 5.5–6+ at FTP is professional level.
Why does W/kg matter more than raw watts?
On climbs you must lift your whole body against gravity, so power relative to weight, not absolute power, determines how fast you go uphill.
What is a good power-to-weight ratio?
Around 2-3 W/kg is recreational, 3-4 is a strong club rider, 4-5 is a competitive amateur, and 5.5-6+ at FTP reaches professional level.
Why does W/kg matter more than watts on climbs?
Climbing is mostly a fight against gravity, which scales with total weight. Power per kilogram therefore predicts climbing speed far better than absolute power.
Should I lose weight or gain power to improve W/kg?
Raising power while maintaining a healthy, well-fuelled weight is usually safer and more effective than aggressive weight loss, which can reduce the power you can produce.
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