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Volatility
IV Rank vs. IV Percentile
An IV of 30% means nothing on its own. These two metrics tell you whether that is high, low, or normal for this market.
NoVo Options Trading · 2026
Implied volatility (IV) tells you how much movement the options market is pricing in - but a raw IV number is useless without context. IV rank and IV percentile both answer the real question: is volatility high or low compared to its own recent history?
IV rank
IV rank places today's IV between its lowest and highest readings over a lookback period (usually a year). If IV ranged from 10% to 50% and sits at 30% today, IV rank is 50 - exactly halfway. It answers: where is IV within its range?
IV percentile
IV percentile instead asks: what fraction of days over the past year had a lower IV than today? An IV percentile of 80 means IV was lower on 80% of days - genuinely elevated. Percentile is often the more robust of the two because a single extreme spike can distort IV rank, while percentile reflects how often the level actually occurs.
"IV is 30%" tells you nothing. "IV is in the 85th percentile" tells you options are expensive right now.
Why it matters
These metrics shape whether buying options is a good deal today. High IV means richer premiums (and more risk of a volatility crush against you); low IV means cheaper options but potentially a sleepy tape. Knowing the volatility regime you are trading into is as important as your directional read - and it is the difference between overpaying and getting a fair price.
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NoVo is a software tool for market analysis and for executing trades you initiate, not financial advice. This article is general education, not investment advice. Options trading involves substantial risk of loss, up to and including your entire capital. NoVo makes no guarantee of profit, win rate, or performance, and past results do not predict future outcomes. You are responsible for your own broker account, configuration, and trading decisions.