Enter your cycling details
Use your most recent repeatable FTP test. Target fields are optional.
Formula used
The standard score uses body mass only. It is expressed in watts per kilogram.
FTP power-to-weight ratio = FTP watts ÷ body weight in kilograms
The optional system score includes rider, bike, and equipment mass.
System ratio = FTP watts ÷ (body weight + bike and equipment weight) in kilograms
For target planning, the calculator reverses the first equation.
Required FTP = target W/kg × target body weight in kilograms
How to use this calculator
- Enter an FTP result from a consistent testing method.
- Enter current body weight and select the correct unit.
- Add bike and equipment weight for an optional system view.
- Enter target ratio or target weight for planning estimates.
- Select Calculate Ratio to view scores and projections.
- Download CSV or PDF when you need a saved record.
Example data
| FTP | Body mass | Bike mass | Body-only ratio | System ratio |
|---|---|---|---|---|
| 250 W | 70 kg | 9 kg | 3.57 W/kg | 3.16 W/kg |
| 300 W | 75 kg | 10 kg | 4.00 W/kg | 3.53 W/kg |
| 220 W | 60 kg | 8 kg | 3.67 W/kg | 3.24 W/kg |
Practical training guide
FTP and rider mass
Functional Threshold Power estimates the highest power you can sustain near one hour. It is measured in watts. Watts alone do not show climbing ability. A lighter rider can climb faster with fewer watts. The power-to-weight ratio connects power with rider mass. It gives a comparison number for cycling.
What the ratio shows
The calculator divides FTP by body weight in kilograms. The answer is watts per kilogram, written W/kg. A larger number usually means stronger climbing potential. It also helps you compare training blocks. Use the same testing method. Consistent testing makes the trend more useful.
Body weight matters
Use your current body weight. Weigh yourself under similar conditions. Morning measurements are more consistent. Small daily changes are normal. Hydration, meals, and clothing can change scale readings. Do not chase a lower weight carelessly. Adequate fuel supports training, recovery, and health.
Bike and equipment weight
Body-only W/kg is the standard metric for FTP comparisons. Bike weight does not change that standard score. However, combined system power can be helpful. It divides FTP by rider, bike, and equipment weight. This view can matter on steep climbs. It also helps when comparing equipment changes.
Understanding the categories
The category labels provide broad context. They are not race rankings. Age, sex, cycling discipline, altitude, and test protocol affect results. A track sprinter and endurance climber can have different strengths. Use categories as a starting point. Compare your own historical scores first.
Set useful targets
Choose a target ratio when planning a training block. You may also enter a target body weight. The calculator estimates the required FTP. For example, a higher target ratio may require more power, less mass, or both. Set realistic milestones. A small sustainable improvement is valuable.
Testing your FTP
Use a repeatable ramp, twenty-minute, or longer threshold test. Follow the same protocol whenever possible. Record indoor trainer settings or outdoor route details. Warm up properly before testing. Rest before important tests. Hard fatigue can suppress your result. Test every four to eight weeks.
Improve the right way
Build fitness through structured riding. Include endurance rides, threshold intervals, and recovery days. Increase training gradually. Eat enough carbohydrate for demanding sessions. Prioritize sleep. Strength training can also help. Consult a qualified coach for personalized planning. Seek medical advice for health concerns.
Limits of a single number
FTP ratio does not measure handling, sprinting, pacing, tactics, or durability. Wind and terrain also matter. A strong ratio does not guarantee race results. Still, it is a training marker. Use it alongside heart rate, perceived effort, and ride performance.
Track changes over time
Save the date, FTP, body mass, and testing method. Review several measurements instead of one result. Look for trends across months. Celebrate steady progress. Adjust goals when life, recovery, or training availability changes. Consistent work usually produces the most useful improvements.
Frequently asked questions
1. What is FTP power-to-weight ratio?
It is FTP in watts divided by body weight in kilograms. The result shows how much sustainable power you produce for each kilogram of body mass.
2. Why does the calculator convert pounds?
The accepted ratio uses kilograms. The calculator converts pounds internally, then calculates the same W/kg score accurately.
3. Should I include bike weight?
Use body weight only for the standard FTP score. Add bike and equipment weight when you want a separate whole-system climbing comparison.
4. Is a higher W/kg always better?
It often helps on climbs. However, sprint ability, aerodynamics, tactics, handling, endurance, and terrain also influence cycling performance.
5. What FTP test should I use?
Use a method you can repeat. Ramp tests, twenty-minute tests, and longer threshold efforts can work when conditions remain consistent.
6. How often should I test FTP?
Many riders test every four to eight weeks. Test after recovery and use the same protocol for meaningful comparisons.
7. Can weight loss improve the score?
Yes, when FTP remains stable. Avoid aggressive restriction. Poor fueling can lower power, recovery quality, and overall performance.
8. What does the target FTP estimate mean?
It shows the watts required to reach your selected W/kg target at the chosen target body weight. It is a planning estimate.
9. Are rider categories exact?
No. They are broad guides. Age, sex, discipline, altitude, equipment, and test method can change how a score should be interpreted.
10. Can I save my calculation?
Yes. After calculating, use the CSV or PDF download buttons. Save results with the date and testing method for better trend tracking.
11. Does W/kg predict race results?
No single number predicts racing. W/kg is useful for climbing potential, but race outcomes also depend on skill, strategy, conditions, and durability.