IV Percentile
The percentage of days over the past year that implied volatility was lower than its current level — indicating how expensive options are relative to their recent history.
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Explained Simply
IV percentile answers: "What percentage of the time was IV lower than it is today?" If IV percentile is 85%, current IV is higher than 85% of the last 252 trading days — options are relatively expensive. If IV percentile is 15%, options are relatively cheap. This differs from IV rank, which measures where current IV falls between the 52-week high and low. IV percentile is generally considered more reliable because it is not distorted by a single extreme spike. Options sellers prefer high IV percentile (selling expensive options), while buyers prefer low IV percentile (buying cheap options).
How IV Percentile Is Calculated
IV Percentile counts the number of trading days over the past year (252 days) where IV was lower than today's reading, then divides by the total days.
Formula: IV Percentile = (Number of days IV was lower than current IV) / 252 x 100
Example: A stock's current IV is 35%. Over the past 252 trading days, IV was below 35% on 200 of those days. IV Percentile = 200 / 252 x 100 = 79.4%. This means current IV is higher than it was on 79% of the past year's trading days — options are relatively expensive.
Why this matters: IV Percentile is more robust than IV Rank because it uses every data point, not just the high and low. A single extreme IV spike (flash crash, surprise earnings) can push the 52-week high to an outlier level, making IV Rank artificially low for months afterward. IV Percentile is unaffected by outliers because it counts frequency, not extremes.
Practical thresholds: IV Percentile above 50 means options are more expensive than usual — favor selling premium. Below 50 means options are cheaper than usual — favor buying. Above 80 is a strong signal for premium-selling strategies. Below 20 is a strong signal for buying options before an expected catalyst.
IV Percentile vs IV Rank: Which to Use
Both metrics answer the same question — are options cheap or expensive relative to history? — but they diverge in specific scenarios:
When they agree: If IV Rank is 75 and IV Percentile is 78, the signal is clear — options are expensive regardless of which metric you use. The same applies when both are low.
When they diverge: The most common divergence happens after a volatility spike. Imagine a stock that normally trades with 20-30% IV. During a market crash, IV spikes to 90% for one day, then returns to its normal range. For the next year, IV Rank will show artificially low readings (current IV of 30% gives an IV Rank of only 14% in a 20-90% range), while IV Percentile correctly shows that 30% IV is above most historical readings (perhaps 65th percentile).
Professional consensus: Most institutional options traders prefer IV Percentile for strategy selection because it is more reliable and less distorted. However, IV Rank is more popular among retail traders because it is simpler to understand and more widely published by brokers.
Best practice: Use both. When they agree, trade with confidence. When they diverge, investigate why — it is almost always due to an outlier spike. In that case, trust IV Percentile and be skeptical of IV Rank.
How to Use IV Percentile
- 1
Understand the Difference from IV Rank
IV percentile counts the percentage of days that IV was lower than today's level over the past year. If IV percentile is 80%, IV was lower than today's level on 80% of trading days in the past year. IV rank uses the high-low range; IV percentile uses the distribution.
- 2
Find IV Percentile Data
Look up IV percentile on options platforms like tastyworks, thinkorswim, or OptionAlpha. Some display it alongside IV rank. If your platform doesn't show it, calculate it: count days where historical IV < current IV, divide by total days, multiply by 100.
- 3
Interpret High vs Low IV Percentile
IV percentile above 50%: options are relatively expensive vs history — favor selling strategies (credit spreads, iron condors). Below 50%: options are cheap — favor buying strategies (debit spreads, long calls/puts). Above 80% or below 20% are the strongest signals.
- 4
Why IV Percentile Can Be Better Than IV Rank
IV rank can be distorted by a single spike. If IV spiked to 100% once during a market crash but usually trades 20-30%, IV rank of 25% seems low even though current IV is higher than 90% of all days. IV percentile gives a more accurate picture of where IV sits in the distribution.
- 5
Apply to Trade Selection
When screening for premium-selling trades, sort by IV percentile descending. Stocks with 80%+ IV percentile offer the richest premiums relative to their norm. Combine with high liquidity (tight spreads, high OI) and your directional or neutral thesis.
Frequently Asked Questions
What is IV Percentile in options?
IV Percentile tells you what percentage of trading days over the past year had implied volatility lower than today's level. An IV Percentile of 80 means current IV is higher than 80% of the past year's readings — options are expensive. An IV Percentile of 20 means IV is lower than on most days — options are cheap. It is considered more reliable than IV Rank because it is not distorted by single-day outlier spikes.
What is a good IV Percentile for selling options?
An IV Percentile above 50 indicates options are more expensive than usual, creating a favorable environment for premium sellers. The ideal range for selling iron condors, credit spreads, and covered calls is 50-80. Above 80, premiums are very rich but may be elevated for a reason (upcoming catalyst). Always check why IV is high before selling.
Should I use IV Rank or IV Percentile?
Use both for the most complete picture. When both agree (both high or both low), the signal is strong. When they diverge, trust IV Percentile — it is more robust against outlier spikes. Professional options traders generally prefer IV Percentile for strategy selection, while retail platforms more commonly display IV Rank.
How Tradewink Uses IV Percentile
Tradewink uses IV percentile as a key factor in trade routing. When IV percentile is above 60, the AI considers options selling strategies (iron condors, credit spreads) alongside directional trades. When below 40, it favors buying options or trading the underlying stock directly. Our screener displays both IV rank and IV percentile.
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See IV Percentile in real trade signals
Tradewink uses iv percentile as part of its AI signal pipeline. Get daily trade ideas with full analysis — free to start.