Watts per Kg Calculator
Power-to-weight and FTP ratingRuns locally · nothing uploaded
Sex
Watts per kg
3.29 W/kg
FTP
230 W
FTP rating
Good
FTP W/kg ratings (male)
| Rating | W/kg |
|---|---|
| Untrained | < 2.23 |
| Fair | 2.23 – 2.78 |
| Good | 2.79 – 3.92 |
| Excellent | 3.93 – 5.04 |
| Superior | ≥ 5.05 |
Estimated climbing speed
| Gradient | Speed | VAM (m/h) |
|---|---|---|
| 6% | 16.7 km/h | 999 |
| 8% | 12.8 km/h | 1,018 |
| 10% | 10.4 km/h | 1,031 |
| 12% | 8.7 km/h | 1,039 |
| 15% | 7.1 km/h | 1,047 |
Steady climb at FTP, no wind resistance, rolling resistance 0.005. Less accurate on shallow grades.
Also works as:w/kg calculatorpower to weight ratio cyclingftp ratingclimbing speed calculator
How it works
Formula
FTP = test power × factor (20 min 0.95, 8 min 0.90, ramp 0.75)W/kg = FTP ÷ body weightClimb: FTP = mass × 9.81 × v × (sinθ + 0.005cosθ)No air resistance; VAM = v × sinθ × 3600.
Worked example
Given: FTP 230 W, 70 kg rider, 8 kg bike
- 230 ÷ 70 ≈ 3.29 W/kg (Good).
- On 8%: v ≈ 3.56 m/s ≈ 12.8 km/h, VAM ≈ 1018 m/h.
Result: 3.29 W/kg; about 12.8 km/h on an 8% climb.
Sources
- Allen H, Coggan A. Training and Racing with a Power Meter. 2nd ed. 2010.
How to use
- 1Choose the power source, enter power and weight.
- 2Pick your sex to see the rating.
- 3Check estimated speed on different gradients.
FAQ
What is a good W/kg?
On Allen & Coggan's FTP scale, men 2.8–3.9 is good, 3.9–5.0 excellent and 5.05+ superior; women about 2.4–3.3, 3.3–4.3 and 4.3+.
Why multiply a 20-min test by 0.95?
FTP is roughly your best one-hour power; 20-minute power is typically about 5% higher.
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