Health & Fitness
Normalized Power from Variability Index
Estimate normalised power from average power and ride variability.
Preparing your result…
What this calculator does
Calculates Normalised Power Calculator using the formula verified against the cited source.
What your result means
An estimate from the inputs you enter, within the scope stated below — not advice.
Formula
NP = average power × VI (when VI = NP ÷ average power is already known); intensity factor IF = NP ÷ FTP
The step-by-step working for your own numbers appears with the result above and in the PDF report.
Frequently asked questions
Symbols and assumptions
- Inputs
- The values entered in the fields above
- • If variability index VI has already been computed as NP/average power, algebra gives NP=average power×VI; IF=NP/FTP. This reconstructs an existing NP and cannot independently calculate it from average power alone.
Sources and review
Reviewed 2026-10-18 · Next review 2027-04-18
- • True NP requires the recorded power time series, beginning with a 30-second rolling mean and nonlinear averaging. Rename this as reconstruction from a supplied VI, or add the actual time series and exact algorithm. FTP is not an input needed to compute NP itself.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Quick reference
| Scenario | Average power (W) | Variability index (from your ride file) | FTP (W) | Normalized power (reconstructed) |
|---|---|---|---|---|
| Worked example | 200 | 1.05 | 250 | 210 W |
| Half the amounts | 100 | 1 | 125 | 100 W |
| Double the amounts | 400 | 2 | 500 | 800 W |
Need the full picture? Get the detailed PDF report with charts, tables, formulas and working steps.
Reviewed 2026-10-18 · Next review 2027-04-18
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