How to Calculate Power-to-Weight Ratio (W/kg)
What is Power-to-Weight Ratio (W/kg)?
Power-to-weight ratio (W/kg) is the key cycling performance metric. The same power with less weight dramatically improves climbing speed.
Formula
- W
- FTP (Functional Threshold Power) / Body weight in kg — FTP (Functional Threshold Power) / Body weight in kg
- FTP
- maximum sustainable power output for approximately 60 minutes — maximum sustainable power output for approximately 60 minutes
Step-by-Step Guide
- 1W/kg = FTP (Functional Threshold Power) / Body weight in kg
- 2FTP = maximum sustainable power output for approximately 60 minutes
- 3Tour de France GC contenders typically reach 6.0-6.5 W/kg
Worked Examples
Frequently Asked Questions
What is Power To Weight Calc?
Power-to-weight ratio (W/kg) is the key cycling performance metric. The same power with less weight dramatically improves climbing speed
How accurate is the Power To Weight Calc calculator?
The calculator uses the standard published formula for power to weight calc. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.
What units does the Power To Weight Calc calculator use?
This calculator works with kilograms, inches, watts. You can enter values in the units shown — the calculator handles all conversions internally.
What formula does the Power To Weight Calc calculator use?
The core formula is: W/kg = FTP (Functional Threshold Power) / Body weight in kg. Each step in the calculation is shown so you can verify the result manually.
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