Power to Weight Ratio Converter logo
Power to Weight Ratio Converter

Cycling Power-to-Weight Ratio Calculator

Enter your power output (FTP or 20-min power) and body weight to get your W/kg.

Decimals:
2
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What Is Cycling W/kg and Why Does It Matter?

In cycling, watts per kilogram (W/kg) is the single most important performance metric for climbing and sustained efforts. Raw wattage tells you how powerful you are; W/kg tells you how powerful you are relative to the weight you're carrying up the hill.

Two riders — one at 250 W / 100 kg (2.5 W/kg) and one at 200 W / 60 kg (3.33 W/kg) — will ride very differently on any climb despite the heavier rider producing more absolute power. The lighter rider climbs significantly faster.

What Power Should I Enter?

Use your FTP (Functional Threshold Power) — the highest average power you can sustain for one hour. If you don't have an FTP test result, use 95% of your best 20-minute average power. Both Zwift and TrainingPeaks use this definition.

Cycling W/kg Categories (Coggan Power Profile)

Category Men (W/kg) Women (W/kg)
Untrained< 2.0< 1.5
Cat 4 / Recreational2.0 – 2.91.5 – 2.4
Cat 3 / Trained3.0 – 3.52.5 – 3.1
Cat 2 / Competitive3.6 – 4.33.2 – 3.8
Cat 1 / Elite amateur4.4 – 5.13.9 – 4.5
Professional5.5 – 7.0+4.5 – 6.0+

How to Improve Your W/kg

There are two levers: increase power or reduce weight (or both). Training raises your FTP — structured interval work, especially threshold and VO2 max intervals, produces the biggest gains. Weight loss of even 2–3 kg can improve W/kg noticeably without touching your FTP.

For most amateur cyclists, consistent training 3–4 times per week with progressive overload will improve W/kg by 0.3–0.6 W/kg over a season.

FAQs

What is a good W/kg for a beginner cyclist?
For a beginner, anything above 2.0 W/kg (men) or 1.5 W/kg (women) is a solid starting point. After 6–12 months of regular riding most people reach 2.5–3.0 W/kg without structured training.
Do I use my body weight or total weight (body + bike)?
For the standard cycling W/kg metric, use body weight only. This is how coaches, Zwift, TrainingPeaks and race categories all define it. Total system weight (body + bike) is sometimes used for physics-based climb-time calculations, but W/kg benchmarks always refer to body weight.
What W/kg do Tour de France climbers sustain?
Elite climbers sustain around 6.0–6.5 W/kg for 20–40 minutes on major climbs. All-time estimates for the fastest Alpe d'Huez ascents suggest around 6.5–7.0 W/kg. These numbers are the result of decades of elite training and, historically, altitude preparation.

Also try: Car P/W Calculator · Motorcycle Calculator · Main Calculator