Health & Fitness
Cycling Power-to-Weight Calculator
Updated Aug 27, 2026 Reviewed Aug 27, 2026
Calculate watts per kilogram across five cycling durations, compare two profiles, and reverse-calculate target FTP power or mathematical body mass.
Duration-specific cycling power profile
Enter body mass and available power values
Result
Calculation summary
Enter values to see the result
Your result, breakdown, assumptions, and warnings will appear here.
Live normalized power profile
Compare efforts on a W/kg scale
Power-to-weight ratio = average power ÷ body mass in kilograms
- FTP ratio
- 3.48 W/kg
- Power at target ratio
- 300 W
- Mathematical mass
- 65.3 kg
How to use this calculator
- 1Enter body mass and the duration powers you have.
- 2Optionally add a previous profile for comparison.
- 3Set a target FTP ratio to reverse-calculate power and mathematical mass.
Formula
power-to-weight ratio = average power (W) ÷ body mass (kg)
Every duration uses the same entered body mass; target power multiplies target ratio by kilograms.
Calculation steps
- Convert body mass to kilograms.
- Normalize each duration and compare optional history.
- Reverse the FTP ratio for target arithmetic without ranking the rider.
Worked example
261 W at 75 kg is 3.48 W/kg; 4.0 W/kg at the same mass requires 300 W.
Assumptions
- Power values are comparable measurements.
- Zero marks an unavailable duration.
- Universal rider labels are omitted.
- Target mass is not health advice.
Sources
Frequently asked questions
Why compare several durations?
They describe different parts of a cycling power profile.
Is higher W/kg always faster?
No; aerodynamics, rolling resistance, absolute power and course conditions also matter.
Why are there no rider tiers?
Reference populations and methods are not universal.
Should I aim for the calculated mass?
No, it is algebra rather than health or nutrition advice.
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