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Cycling Power (Watts) & Energy Calculator

Estimate mechanical wattage output and speed based on bike weight and slope.

Tool inputs stay in your browser · optional AI search sends your query

Good to know: Estimates cyclist power based on aerodynamic drag, rolling friction, and gravitational climbing resistance.

How to use it (step by step)

  1. 1Fill in the boxes: “Rider + Bike Weight (kg)”, “Speed (km/h)”, “Hill Gradient / Slope (%)”. Example numbers are already there so you can see how it works; replace them with yours.
  2. 2The result updates instantly as you type (on a phone it is below the boxes).
  3. 3The bold line is the main answer. Tap Copy next to any value to copy it.

Words to know

Pace / speed
Speed = distance per hour (km/h). Pace = time per distance (minutes per km), common in running.
Percentage
A part out of 100. 25% of 200 = 50.
Gradient
A smooth blend from one color into another.

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