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What implied volatility is, how it is calculated, and how to use it in options trading — a complete guide with an India VIX explanation.
Published by The Retail Trader · AUG 07, 2026 · Features
What implied volatility is, how it is calculated, and how to use it in options trading — a complete guide with an India VIX explanation.
Implied Volatility tells you how much movement the market expects in a stock or index. It is a percentage that indicates how far the price could swing up or down.
High IV (>25%): The market expects a BIG move. Options are expensive. Low IV (<15%): The market expects a SMALL move. Options are cheap.
Important: IV does NOT tell you direction — only magnitude. High IV means a big move is expected, but nobody knows whether it will be up or down.
IV vs Historical Volatility (HV):
• What it tells you — Implied Volatility (IV): Future expectation, Historical Volatility (HV): Past movement
• Based on — Implied Volatility (IV): Option prices, Historical Volatility (HV): Actual price data
• Use — Implied Volatility (IV): Option pricing, Historical Volatility (HV): Backtesting
• Direction — Implied Volatility (IV): Forward-looking, Historical Volatility (HV): Backward-looking
IV > HV: Options are expensive (the market expects more movement) IV < HV: Options are cheap (the market expects less movement)
India VIX is NSE's official volatility index. It measures the implied volatility of Nifty options.
India VIX Levels:
• < 12 — Meaning: Very Low Volatility, Market Mood: Calm, complacent, Strategy: Sell options (cheap premium)
• 12-15 — Meaning: Normal Volatility, Market Mood: Stable, Strategy: Normal trading
• 15-20 — Meaning: Elevated Volatility, Market Mood: Cautious, Strategy: Reduce position size
• 20-25 — Meaning: High Volatility, Market Mood: Fearful, Strategy: Buy options (big moves expected)
• > 25 — Meaning: Extreme Volatility, Market Mood: Panic, Strategy: Buy options, expect reversal
India VIX Historical Patterns:
• COVID crash (Mar 2020) — VIX Spike: ~80, What Happened After: VIX crashed, market rallied
• Budget 2024 — VIX Spike: ~25, What Happened After: VIX normalized next day
• Election results 2024 — VIX Spike: ~30, What Happened After: VIX crashed after results
• Global banking crisis 2023 — VIX Spike: ~20, What Happened After: VIX normalized in weeks
Pattern: VIX mean reverts. Extreme high VIX → VIX will fall. Extreme low VIX → VIX will rise.
Option premium = Intrinsic Value + Time Value + Volatility Premium
High IV:
• Option premium RISES (expensive)
• Biggest impact on ATM options
• Significant impact on OTM options too
Low IV:
• Option premium FALLS (cheap)
• An opportunity for buyers
• Less premium for sellers
Nifty 20,000 CE, 14 days to expiry:
Keep these four points in mind:
• IV = 12% — Option Price: ₹80, Change: Base
• IV = 15% — Option Price: ₹95, Change: +₹15 (+19%)
• IV = 20% — Option Price: ₹120, Change: +₹40 (+50%)
• IV = 25% — Option Price: ₹150, Change: +₹70 (+88%)
Meaning: Just from a change in IV, the option price can go up to 2x — without Nifty moving at all!
Before events (earnings, budget, election) IV rises. After the event, IV suddenly drops. This is called IV Crush.
Scenario: Company XYZ is about to announce results.
Keep these three points in mind:
• Before results: IV 30% → Option price ₹200 (expensive)
• Results announced: Stock rose 2%
• After results: IV fell to 15% → Option price ₹120
The stock went up, but the option price FELL! How? IV crush ate up more money than the price gain.
As a Buyer:
• ❌ Don't buy options before results (expensive premium)
• ✅ Buy after results, once IV has dropped
• ✅ Use a calendar spread (sell near-term, buy far-term)
As a Seller:
• ✅ Sell options before results (high premium)
• ✅ Buy back after results (profit from IV crush)
• ✅ Build iron condors and credit spreads
Concept: IV mean reverts. High IV will move to low IV, low IV will move to high IV.
Setup:
• India VIX > 20 → Sell options (Iron Condor, Credit Spread)
• India VIX < 12 → Buy options (Long Straddle, Long Strangle)
• Profit from VIX mean reversion
Best for: Experienced options traders
Setup:
• 2-3 days before results → Sell an ATM Straddle (high IV)
• After results → IV crush will occur → Buy back the Straddle
• Profit = Premium collected - Premium paid
Risk: If the stock moves a lot (gap up/down), you can take a loss.
Best for: Large-caps with predictable earnings reactions
IV Percentile tells you where current IV stands over the last 1 year:
Keep these four points in mind:
• > 80% — Meaning: IV is very high (historically), Strategy: Sell options
• 50-80% — Meaning: IV is normal-high, Strategy: Neutral
• 20-50% — Meaning: IV is normal-low, Strategy: Neutral
• < 20% — Meaning: IV is very low (historically), Strategy: Buy options
Example: Nifty IV Percentile = 85% → IV is historically very high → Sell options (Iron Condor)
IV Skew occurs when the IV of different strike prices differs:
Put Skew (Common):
• IV of OTM puts > IV of OTM calls
• Meaning: The market fears the downside more
• Strategy: Sell OTM puts (expensive), buy ATM puts
Call Skew (Rare):
• IV of OTM calls > IV of OTM puts
• Meaning: The market expects more upside
• Strategy: Sell OTM calls (expensive), buy ATM calls
India VIX Chart:
• Go to /charting
• Search "^INDIAVIX" or "India VIX"
• Look at VIX levels on the daily/weekly chart
• Support/resistance on VIX → clues to market direction
View the options chain on TRT's SUPERCHART:
• Select a stock
• Open the options chain
• IV is shown at every strike
• IV comparison across strikes = skew
High IV = expensive premium. After results, IV crush pulls the option price down even if the stock moves in your direction.
IV doesn't tell you direction — only magnitude. High IV expects a big move, not a direction.
IV is one factor in option pricing. Delta, theta and gamma matter too. Don't make decisions on IV alone.
Low IV = low premium. Low reward for sellers. Buying is better at low IV (cheap options).
If VIX is 50+, don't sell thinking "it will fall now". VIX can go even higher. Wait for VIX to actually start declining.
Keep these points in mind:
• 📌 IMPLIED VOLATILITY QUICK REFERENCE
• IV LEVELS:
• 📊 < 12% = Very low (options cheap, BUY)
• 📊 12-15% = Normal
• 📊 15-20% = Elevated (caution)
• 📊 20-25% = High (options expensive, SELL)
• 📊 > 25% = Extreme (panic, expect reversal)
• IV CRUSH:
• ⚠️ IV rises before events
• ⚠️ IV suddenly drops after events
• ⚠️ Option price falls even if the stock moves your way
• ⚠️ Sellers profit from IV crush
• STRATEGIES:
• ✅ High IV (>20) → Sell options (Iron Condor, Credit Spreads)
• ✅ Low IV (<12) → Buy options (Long Straddle, Long Strangle)
• ✅ Before results → Sell (high premium)
• ✅ After results → Buy (IV crush has happened)
• ✅ IV Percentile > 80% → Sell
• ✅ IV Percentile < 20% → Buy
• INDIA VIX:
• 📊 < 12 = Complacent (market calm)
• 📊 12-15 = Normal
• 📊 15-20 = Cautious
• 📊 20-25 = Fearful
• 📊 > 25 = Panic (usually near bottom)
Keep these five points in mind:
• What Are Option Greeks?
• How To Read An Option Chain?
• How Does F&O Expiry Work?
• The Math Of Option Buyer Vs Seller
• A Basic Understanding Of Hedging
The Retail Trader — educational market analysis. Not investment advice.
This article is educational only — it contains no buy or sell recommendation, no claim of guaranteed returns, and no advisory. Rules, rates and mechanics are changed from time to time by the exchanges, SEBI and the RBI, so verify every number yourself with your broker or the official source.