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Cycling Calculators

Bike Power-to-Weight Calculator

Cycling power-to-weight ratio in watts per kilogram, with the rider category it corresponds to.

Enter values

Results update as you type.

Result

Power-to-weight

3.47 W/kg

Category
Enthusiast
20-minute power estimate
263 W
Power for 5 W/kg
360 W

About the Bike Power-to-Weight Calculator

Cycling power-to-weight ratio in watts per kilogram, with the rider category it corresponds to.

Also known as: w/kg calculator, watts per kg, ftp per kg, cycling power ratio.

How to use this calculator

  1. Enter power (ftp or average), weight unit.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

W/kg = power ÷ body weight

Worked example

Using the values pre-filled in the calculator above:

  • Power (FTP or average) = 250 W
  • Weight unit: kg
  • Body weight = 72 kg

the calculator returns:

  • Power-to-weight: 3.47 W/kg
  • Category: Enthusiast
  • 20-minute power estimate: 263 W
  • Power for 5 W/kg: 360 W