Critical power calculator cycling
Two maximal efforts, between 2 and 20 minutes, for an estimate. It is not a race plan.
Worked example
Worked example: 253 W. Critical power. Reserve: 32.0 kJ. Power at 5 minutes: 360 W. Model fit: 1.00. Change the numbers and the result updates immediately.
How to use it
- You need two maximal efforts, of different lengths, between 2 and 20 minutes.
- Enter minutes and average watts for each. A third effort makes the estimate steadier.
- Do not use sprints. This is not a race plan.
The model says work is critical power times time, plus a reserve. You need maximal efforts of different lengths, about 2 to 20 minutes: sprints do not fit. A third effort makes the estimate more stable. You can then read power at 5 minutes and how long you last above critical power. For pace on a GPX, use Kyrie.
Critical power and the reserve · FTP and threshold · Fat burning zone
FTP calculator · Fat burning zone · Critical power guide