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Power is the rate of performing work. It measures how much energy is created in each second that passes, the size of the force applied and the velocity at which it is applied.

Power {(Force × Distance) ÷ Time} represents the product of strength and speed of movement expressed in Watts, where Force is measured in Newtons (1kg=10N), the Distance in metres and Time in seconds.

  • 1 Watt = 0.73756 ft/lb/sec = 6.12 kg/m/min
  • 1 Watt = 0.01433 kcal/min = 0.05 ml/kg/min
  • 1 kcal/min = 3.5 ml/kg/min
  • 1 kcal = 4.186 kjoules
  • 1 kjoule = 0.23889 kcal


An 80 kg athlete can run up a set of stairs vertical height of 3 metres in 1.5 seconds.

  • Force = 800 N (80 x 10), Distance = 3 metres, Time = 1.5 seconds
  • Energy = 800 x 3 = 2400 joules
  • Power = Energy (joules) ÷ Time (seconds)
  • Power = 2400 ÷ 1.5 = 1600 watts

Power calculator

For a calculation of power, enter the Distance, Weight and Time and then select the 'Calculate' button.

Distance   Weight Kg   Time hrs mins secs
  Energy joules   Power watts

Anaerobic Power

Anaerobic power is the ability to produce energy by the ATP-PC energy system and can be assessed with the Running-based Anaerobic Sprint Test (RAST). Fry (2014)[1] found that the Kansas squat test provides a reliable indicator of short-term anaerobic power.

Aerobic Power

Aerobic power depends on the muscular tissues' chemical ability to use oxygen in breaking down fuels and the combined capability of the cardiovascular and pulmonary systems to transport oxygen to the muscular tissues.


  1. FRY, A. C. et al. (2014) Kansas Squat Test: A Reliable Indicator of Short-term Anaerobic Power. The Journal of Strength & Conditioning Research, 28 (3), p. 630-635

Page Reference

If you quote information from this page in your work, then the reference for this page is:

  • MACKENZIE, B. (2003) Power [WWW] Available from: [Accessed