Cycling watts per kilogram calculator
Watts per kilogram divides a power value by body mass and helps compare sustained climbing output. Enter power and mass to calculate the ratio with remembered units. The number is not a rider ranking. On flat roads, absolute power and aerodynamics matter; on climbs, bike mass and conditions matter as well.
Your result, in detail.
Review the assumptions before turning a calculation into a target.
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Why this number?
W/kg = watts ÷ body mass in kilograms. Pounds convert with 1 lb = 0.45359237 kg.
How do I use it?
- Enter recent, representative values.
- Choose units and check the assumptions.
- Review the result and its context.
- Copy, share or print the output.
Public inputs are encoded in share links. Check what you are sharing.
Questions, answered.
What is my power-to-weight ratio?
Watts per kilogram divides a power value by body mass and helps compare sustained climbing output. Enter power and mass to calculate the ratio with remembered units. The number is not a rider ranking. On flat roads, absolute power and aerodynamics matter; on climbs, bike mass and conditions matter as well.
Does W/kg predict speed on every route?
No. It is power divided by body mass. Aerodynamics, terrain, total system mass and conditions also affect speed.
Should I compare values from different-duration tests?
Record the power duration and method. A sprint ratio and an FTP ratio describe different performances.
What does the result assume?
W/kg = watts ÷ body mass in kilograms. Pounds convert with 1 lb = 0.45359237 kg.
Is this an exact prediction?
Arithmetic conversions are exact within input precision. Physiology models and planning scenarios are estimates; use the assumptions and your training response.
Can I change units or share this result?
Yes. Unit preference is remembered on this device. The share link includes calculator inputs; review them before sharing.
Do I need an email address?
No. Results, methodology and printable output are available without an email wall.