Variability Index Calculator

Variability Index (VI) measures how smooth (evenly paced) or variable (with frequent changes) was your power output during your ride. Enter Average and Normalized Power to get a Variability Index of your cycling workout.

Average Power

Normalized Power

Training with a power meter?

Start tracking your cycling power and get actionable insights from your training. Our AI-powered tools are designed to help you become a stronger and faster cyclist in less than 8 weeks.

More Cycling Calculators

New in mobile app

AI Cycling
Coach

Get instant, personalized answers about your training.

FormBeat's AI Coach understands your entire training history, fitness level, and every ride you've logged. Get actionable insights and personalized advice to level up your training.

🚴 How was my last ride?

Get a quick breakdown of your most recent activity

⛰️ How can I improve my climbing?

Get personalized training recommendations

🎯 Where should I focus to get faster?

Find your highest-impact training priority

📊 How am I doing this month?

Understand your training trends and progress

Intuitive, AI-powered cycling analytics.