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Cycling Power from Speed Slope and Drag Calculator

P = (F_gravity + F_drag + F_roll) × v.

Estimates cycling power output from speed, gradient, drag area (CdA), rolling resistance (Crr), and total mass. Accounts for aerodynamic drag, gravity, and rolling resistance forces.

Nadia Almasri By Nadia Almasri
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

P = (m×g×grade/100 + 0.5×1.225×CdA×(v/3.6)² + m×g×Crr) × v/3.6

In depth

Estimates cycling power output from speed, gradient, drag area (CdA), rolling resistance (Crr), and total mass. Accounts for aerodynamic drag, gravity, and rolling resistance forces.