What is power-to-weight ratio?

Power-to-weight ratio (W/kg) is your cycling power output (typically FTP — Functional Threshold Power) divided by your body weight. It is the single most important metric for predicting cycling performance on climbs and time trials.

What is a good power-to-weight ratio?

For recreational cyclists, 2.0-3.0 W/kg is typical. Competitive amateur racers are 3.5-4.5 W/kg. Professional cyclists typically sustain 5.5-6.5 W/kg at threshold. World-class climbers (Tour de France GC contenders) can sustain 6.0-6.7 W/kg.

Should I increase power or decrease weight?

Both improve W/kg, but there are diminishing returns. If you are carrying excess body fat, losing weight is often easier. If you are already lean, increasing power through structured training (intervals, sweet spot work) is the safer path. Losing too much weight impairs power and health.

Functional Threshold Power is the highest power you can sustain for approximately one hour. It is typically estimated via a 20-minute all-out test (multiply average power by 0.95) or a ramp test. FTP is the gold standard for setting cycling training zones.

Power-to-Weight Ratio (W/kg)

Convert your FTP and bodyweight into watts per kilogram — the single most important cycling performance metric.

Calculator

Why Power-to-Weight Matters

On flat terrain, absolute power (watts) determines speed. On climbs, power-to-weight ratio matters because you must lift your body weight against gravity. A 70kg rider at 4.0 W/kg (280W) will climb the same speed as a 60kg rider at 4.0 W/kg (240W) — despite the difference in absolute power.

Classification System

This tool uses a modified version of Andy Coggan's power profiling table, which categorizes cyclists from untrained through world-class. The classifications are based on sustained power (FTP), not peak or sprint power.

Power-to-Weight Classifications

W/kgClassification

< 2.0Untrained

2.0 – 2.5Fair

2.5 – 3.25Moderate / Cat 5

3.25 – 4.0Good / Cat 3-4

4.0 – 4.75Very Good / Cat 2

4.75 – 5.5Excellent / Cat 1

5.5 – 6.0Exceptional / Pro

6.0+World Class

Medical Disclaimer

Power-to-weight classifications are general guidelines based on male FTP values. Female values are typically 10-15% lower at each level. Individual performance depends on many factors beyond W/kg.

Power-to-Weight Ratio (W/kg)

Why Power-to-Weight Matters

Classification System

Power-to-Weight Classifications

Medical Disclaimer

Frequently Asked Questions

Related Calculators

Track Your Power to Weight Over Time