Cycling Power-to-Weight Ratio Calculator
Calculate your cycling power-to-weight ratio (W/kg) and see how it compares to rider categories.
How to use this tool
- Enter ftp (functional threshold power) and rider weight in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your power-to-weight and the full breakdown beneath it.
Power-to-weight ratio (W/kg) is the key metric in road cycling — especially on climbs. It is calculated as FTP ÷ body weight. Higher values allow you to climb faster for the same body weight.
Formula
Power-to-weight ratio (W/kg) = FTP (W) ÷ Rider weight (kg)
How it works
The calculator divides your Functional Threshold Power by your body mass to give the W/kg ratio, which determines climbing ability and is the most widely used metric for comparing cyclists of different sizes.
Category boundaries used here (Untrained <2, Recreational 2–3, Trained 3–4, Competitive 4–5, Pro domestic 5–6, World Tour/Elite ≥6 W/kg) are commonly cited in the sport but are approximations; individual performance also depends on aerodynamics, tactics, and terrain.
Worked example
Worked example
- FTP = 250 W, rider weight = 70 kg.
- W/kg = 250 ÷ 70 ≈ 3.57 W/kg.
- 3.57 falls in the 3–4 W/kg band.
Power-to-weight ratio = 3.57 W/kg — category: Trained
Key terms
- FTP (Functional Threshold Power)
- The highest average power a cyclist can sustain for approximately 60 minutes; the foundation of power-based training.
- W/kg
- Watts per kilogram; the power-to-weight ratio used to compare cyclists and predict climbing performance.
- Rider category
- A classification (Untrained through World Tour) based on W/kg bands, giving a rough indication of competitive level.
- Climbing ability
- On sustained gradients, heavier riders must produce more power to maintain pace, making W/kg the key predictor of hill performance.
- Aerobic capacity (VO2max)
- The maximum rate of oxygen consumption; closely linked to FTP and W/kg in trained cyclists.
Frequently asked questions
- What is a good W/kg for cycling?
- Recreational cyclists typically produce 2–3 W/kg. Trained club riders average 3–4 W/kg. Tour de France climbers sustain 6+ W/kg.
- How do I improve my power-to-weight ratio?
- You can raise FTP through structured training (intervals, tempo rides) and lower weight by reducing body fat — both together give the fastest gains.