The cycling wattage calculator
Work out the power you need for any speed, or the speed you get for any power, including hills, wind, weight and position.
The free cycling wattage calculator works out how much power a ride takes, or how fast a given power will take you.
Choose what to solve for
Enter a Speed to see the power needed, or a Target power to see your speed.
Set the conditions
Add the Grade, Wind, Rider weight and Bike + kit.
Fine-tune it, if you like
Change Riding position and Tyres, or enter a custom CdA and Crr. You can also set the air temperature, drivetrain efficiency, elevation and ride duration.
Read the results
You will see your Required power or Predicted speed, Pedal power, Watts per kilogram and Energy. What the wind costs you puts the headwind in watts.
Last updated 31 October 2026