Cycling Normalized Power Calculator
Paste your per-second power samples and optional FTP to compute Normalized Power.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
The cycling Normalized Power calculator processes per-second power-meter data through the algorithm Dr. Andrew Coggan developed: it takes a 30-second rolling average of the power samples, raises each rolling average to the 4th power, averages those values, then takes the 4th root to get NP — a number that better reflects the true physiological cost of a variable-effort ride than a simple average watts figure does.
Alongside NP, the calculator reports the Variability Index (VI = NP ÷ average power, where a number close to 1.0 indicates a steady, even effort) and, if you supply your Functional Threshold Power, the Intensity Factor (IF = NP ÷ FTP), which shows what fraction of your threshold the ride represented. Cyclists and coaches using training platforms like TrainingPeaks or WKO rely on NP, VI, and IF together to quantify training stress and compare the intensity of rides with very different power profiles — a steady time trial versus a surging criterium, for instance.
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