Estimates cycling power output (watts) based on speed, gradient, weight, and other factors.
Start with your values, or try a preset.
Enter Rider Weight, Bike Weight, Speed, Grade, Rolling Resistance Coefficient, Drag Coefficient, and Frontal Area in the units shown.
Read Velocity (m/s), Air Density, Total Weight, Air Resistance Force, Gravity Force, Rolling Resistance Force, Grade Force, Total Resistance Force, and Power Output in the results panel. Results update as you change the inputs.
Choose a preset to load an example, then adjust the values for your situation.
See the inputs and their calculated results.
Rider Weight: 75 kg; Bike Weight: 10 kg; Speed: 20 km/h; Grade: 0 %; Rolling Resistance Coefficient: 0.005; Drag Coefficient: 0.85; Frontal Area: 0.4 m²
Velocity (m/s): 5.555555556 m/s; Air Density: 1.225 kg/m³; Total Weight: 85 kg; Air Resistance Force: 6.427469136 N; Gravity Force: 833.85 N; Rolling Resistance Force: 4.16925 N; Grade Force: 0 N; Total Resistance Force: 10.59671914 N; Power Output: 58.87066187 W
Rider Weight: 70 kg; Bike Weight: 8 kg; Speed: 30 km/h; Grade: 0 %; Rolling Resistance Coefficient: 0.004; Drag Coefficient: 0.75; Frontal Area: 0.35 m²
Velocity (m/s): 8.333333333 m/s; Air Density: 1.225 kg/m³; Total Weight: 78 kg; Air Resistance Force: 11.16536458 N; Gravity Force: 765.18 N; Rolling Resistance Force: 3.06072 N; Grade Force: 0 N; Total Resistance Force: 14.22608458 N; Power Output: 118.5507049 W
Rider Weight: 80 kg; Bike Weight: 9 kg; Speed: 15 km/h; Grade: 5 %; Rolling Resistance Coefficient: 0.006; Drag Coefficient: 0.85; Frontal Area: 0.4 m²
Velocity (m/s): 4.166666667 m/s; Air Density: 1.225 kg/m³; Total Weight: 89 kg; Air Resistance Force: 3.615451389 N; Gravity Force: 873.09 N; Rolling Resistance Force: 5.23854 N; Grade Force: 43.6545 N; Total Resistance Force: 52.50849139 N; Power Output: 218.7853808 W
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