Simple Power to Speed Calculator

A simple version of the Power to Speed Calculator. This calculator assumes a flat course, a bike equipped with commonly used road bike tires and ideal cycling conditions (no wind, 20°C).

  Weight of rider + bike = kg

  CdA = 0. m2

  Power = Watt

  •   Weight of rider + bike = kg

  •   CdA = 0. m2

  •   Power = Watt

  Speed

0 km/h

About this calculator

Because the speed of a cyclist depends on many factors, the above calculator will only give you a rough idea of the power to speed ratio in terms of the aerodynamic drag coefficient CdA. In order to do so the calculator has to make a few assumptions. To name a few: A flat course, a cyclist riding an average road/triathlon bike equipped with Continental Grand Prix 4000 S II tires and an air density which you often experience at 20°C and close to the sea level.

The drag area CdA

The CdA is the product of the real drag coefficient cd (often also named cw) and A - the frontal area of rider and bike. The CdA of a road cyclist, riding with his hands on the hoods can be around 0.4 m2, while the best time trialists and triathletes achieve CdAs as low as 0.2 m2. Of course, the body size, the material and above all the riding position play an important role here, so that the value varies for every athlete and every bike.

Calculator with more options

Here you can find an extend version of the Power to Speed Calculator together with some notes on the calculator and the formulas behind it.

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