Normalized Power & Intensity Factor Calculator - Coggan 4th-Power Physiological Modeling
Measure true biological metabolic cost and pacing efficiency of cycling workouts without needing a paid TrainingPeaks subscription.
How to Use Normalized Power NP in 3 Simple Steps
Step 1: Upload
Drag & drop your .FIT, .GPX, or .TCX activity file. All processing is 100% private in your browser.
Step 2: Process
FitCrop inspects telemetry streams, removes anomalies, recalibrates metrics, or fixes binary checksums.
Step 3: Export
Download your clean Strava, Garmin, and Zwift compatible file with 1 click. Zero server wait.
Frequently Asked Questions
Why is Normalized Power (NP) higher than Average Power?
NP weights intense efforts exponentially to the 4th power because high-intensity anaerobic bursts consume glycogen and accumulate lactate much faster than steady endurance riding.
What is an optimal Variability Index (VI) for a Time Trial or Triathlon?
A VI of 1.05 or lower indicates smooth, highly efficient pacing with minimal energy wasted in micro-sprints.