--- title: "IV rank or IV percentile: what is the difference | RupeeCase" description: "IV rank places today's implied volatility between the lowest and the highest reading of the trailing year." source_url: "https://www.rupeecase.com/learn/questions/iv-rank-vs-iv-percentile" --- One spike on 30 Mar 2026 sets the top of the rank scale for the months that follow Nifty 30 day at the money implied volatility, daily, from 1 Jul 2025 to 10 Jun 2026, the series behind both measures. Each point is an annual percentage. Source: NSE end of day data, computed by RupeeCase. As of 10 Jun 2026. Both measures ask the same question: is today's IV high or low against its own history? Both need a long run of trading days, ideally a year, and one consistent series. Use the constant 30 day at the money series for Nifty, not the nearest weekly, because the weekly reading jumps around expiry. Rank is a position in a range. It is today's IV less the lowest reading, divided by the highest less the lowest, times one hundred. The weakness is the range itself. One extreme day sets its top or bottom, and every other day is measured against that one day. Percentile is a count. It is the share of past days on which IV was below today's reading. It does not care how extreme the highest day was, so a single spike cannot compress the rest of the year. The chart shows the constant 30 day at the money IV of Nifty across the window. The high of 30 Mar 2026 sets the top of the rank scale for the months after it. On 10 Jun 2026 the rank sits in the lower part of that scale, while the percentile sits well above it, because most past days were lower than that day's reading. Same day, same series, two very different readings. The series here starts on 1 Jul 2025, so the window is about eleven months, not a full year. Neither measure says the option is cheap or dear against the movement that follows. That is the question of realised against implied volatility. A low rank or percentile says only that the reading is unusual against the trailing year. The IV rank and percentile tool runs both on a dated series, so you can see the two numbers part ways after a spike. **Before you trade.** Derivatives trading carries a high risk of loss. SEBI's study "Profitability of Individual Traders in the Equity Derivatives Segment (FY25 to FY26)" (August 2026) found that 87.7% of individual traders in equity F&O made net losses in FY26, with aggregate net losses of Rs 91,685 crore. [Read the SEBI study](https://www.sebi.gov.in/reports-and-statistics/research/aug-2026/study-profitability-of-individual-traders-in-the-equity-derivatives-segment-fy25-fy26-_103835.html) IV rank or IV percentile: what is the difference?IV rank places today's implied volatility between the lowest and the highest reading of the trailing year, so one spike sets the top of the scale and can squeeze every later reading low. IV percentile counts the share of past days with a lower reading, so it uses the whole distribution and is much less distorted by a single spike. LGo deeper ## Where Learn teaches this. [Go deeperIV rank and IV percentile, done properly9 min, Intermediate](/learn/path-16/module-16-4-iv-rank-and-iv-percentile)[Go deeperVolatility: historical against implied7 min, Beginner](/learn/path-16/module-16-1-historical-vs-implied-volatility)[Try itIV rank and percentileBoth definitions side by side on a dated series.](/learn/tools/iv-rank-percentile) SSources ## Go to the source. 1. [NSE, India VIX: what it measures and how it is computed](https://www.nseindia.com/static/products-services/indices-indiavix-index) NSE 2. [NSE, India VIX white paper (how NSE turns Nifty option quotes into one volatility number)](https://nsearchives.nseindia.com/web/sites/default/files/inline-files/white_paper_IndiaVIX.pdf) NSE 3. [NSE, derivatives reports and daily end of day files](https://www.nseindia.com/all-reports-derivatives) NSE ?Questions people ask ## Related questions. [QuestionWhat is implied volatility?Beginner](/learn/questions/what-is-implied-volatility)[QuestionWhat is India VIX?Beginner](/learn/questions/what-is-india-vix)[QuestionHow is an option price calculated?Intermediate](/learn/questions/how-option-price-is-calculated) [All 130 questions](/learn/questions/) Explore next ## Go deeper on this question. * [QuestionHistorical, implied and realised volatility: what is the difference?A short answer with a dated chart](/learn/questions/historical-implied-realised-volatility) * [ToolOption payoff builderLegs on a dated Nifty chain, breakevens and charges](/learn/tools/payoff-builder) * [GlossaryInvesting glossary, 230 termsPlain word definitions, and the app’s own](/learn/glossary) Community ## Join my WhatsApp group. Scan the code, fillFill one short form, and join my WhatsApp group. Slides, sources, factsheets and the rebalance logs live there, and members join a daily Google Meet with me. New to RupeeCase? [Getting started](/getting-started) [See the terminal](/terminal) [Sign up for RupeeCase](https://invest.rupeecase.com/signup) [Join the WhatsApp group](https://forms.gle/C6HMtM1Z2GfeocQV7) [One form, one group](https://forms.gle/C6HMtM1Z2GfeocQV7)Scan with your phone camera Education only, not investment advice, a research report or a recommendation to buy, sell or hold any security. RupeeCase (QC Alpha Technologies Pvt Ltd) is not registered with SEBI as an investment adviser or research analyst. Contracts and prices shown are for illustration only, come from NSE end of day files at least 30 days old, and are not recommendatory. Derivatives trading carries a high risk of loss.