Power-to-Weight Ratio
Watts per Kilogram (W/kg)
Convert FTP and bodyweight into W/kg — the primary cycling performance metric across tiers.
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/kg | Classification |
|---|---|
| < 2.0 | Untrained |
| 2.0 – 2.5 | Fair |
| 2.5 – 3.25 | Moderate / Cat 5 |
| 3.25 – 4.0 | Good / Cat 3-4 |
| 4.0 – 4.75 | Very Good / Cat 2 |
| 4.75 – 5.5 | Excellent / Cat 1 |
| 5.5 – 6.0 | Exceptional / 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.