Critical Power Calculator

Model equation

Critical Power × Duration + W′ = Actual Power × Duration

Data Points (up to 4)

Duration accepts seconds (e.g. 300) or mm:ss (e.g. 5:00).

Point

Duration

Power (W)

Add one hypothetical point. If duration already exists above, its power is replaced; otherwise a new point is added.

New Point

Critical Power

W′

Correlation Coefficient (r)

Points are measured efforts. Line is the regression model.

Critical Power is the slope of the line, and W′ is the y-intercept.

Curve follows P(t) = CP + W′/t. Points are your entered efforts.

Point	Duration	Actual Power	Expected Power	Difference

Point	Duration	Actual Power	Expected Power	Difference