Cycling Power Calculator
Estimate the watts required to ride at a given speed, weight, and gradient using cycling physics.
Rider + bike
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Calculation Method
Cycling Power Calculator
This calculator estimates the power in watts you need to ride at a given speed, weight, and gradient, using the same physics model that powers cycling speed tools.
The Power Model
Power is the sum of three forces you overcome: rolling resistance, aerodynamic drag (which rises with the cube of speed), and gravity on a climb, all divided by drivetrain efficiency.
Watts per Kilogram
Dividing power by weight gives watts per kilogram, the key metric for climbing. Recreational riders sustain about 2 to 3 W/kg at threshold, while pros reach 5.5 to 6.5 W/kg.
Frequently Asked Questions
Power is the sum of the forces you overcome multiplied by your speed: rolling resistance, aerodynamic drag (which rises with the cube of speed), and gravity on any incline, all divided by drivetrain efficiency. This calculator uses standard road-cycling constants.
On flat ground a typical rider needs roughly 180 to 250 watts to hold 20 mph (32 km/h), depending on weight, position, and equipment, because aerodynamic drag dominates at that speed.
Recreational riders often sustain about 2 to 3 W/kg at threshold, strong amateurs 3.5 to 4.5 W/kg, and professionals 5.5 to 6.5 W/kg. Higher power-to-weight is a major advantage on climbs.
How is cycling power calculated?
How many watts to ride at 20 mph?
What is a good watts per kilogram?
Related Calculators
Other helpful calculators for Cycling
Cycling Speed Calculator
Calculate your cycling speed based on the distance and time.
Cycling Power to Speed Calculator
Calculate your speed based on power output, temperature, altitude, and other factors.
Cycling Watts Per Kilo (w/kg) Calculator
Calculate your watts per Kg based on your Functional Threshold Power (FTP) and weight.
FTP Calculator | Cycling Functional Threshold Power
Free FTP calculator for cyclists. Calculate your Functional Threshold Power (FTP) using test results, get your W/kg power-to-weight ratio, and determine personalized cycling power zones.