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India VIX is NSE's own index for the market's expected volatility in Nifty over the coming 30 days, calculated from live Nifty option prices and quoted as a single annualized percentage — a fast way to check whether the options market as a whole is pricing in calm or turbulent conditions.

India VIX is computed by NSE from the bid-ask prices of out-of-the-money Nifty options across the near and next-month expiries, blended into a single expected-volatility figure for the coming 30 days. It's the same underlying idea as Implied Volatility on an individual option, but aggregated across the whole Nifty options market into one standardized number, rather than quoted separately for every single strike and expiry.

A VIX reading by itself is just a percentage — its real usefulness comes from converting it into an actual expected price range, using a standard, checkable formula:

Expected 1-SD move = Spot × (VIX ÷ 100) × √(Days ÷ 365)

This gives the expected size of a "one standard deviation" move — roughly, the range the underlying has about a 68% statistical chance of staying within over that period, under the assumptions the options market is pricing in.

Suppose Nifty is at 24,000 and India VIX reads 14:

With VIX at 14, the market is pricing roughly a ±466-point range for Nifty over the next 7 days as the "typical" outcome — useful context before judging whether a specific strike, for a strategy like an Iron Condor or Short Strangle, sits inside or outside that expected range.

Holding spot and the 7-day horizon fixed, and only changing the VIX level:

The expected move roughly triples going from VIX 10 to VIX 30 — a useful sanity check for how much wider a "normal" trading range gets as VIX climbs.

• High VIX favors premium-selling strategies — the same logic covered on the Implied Volatility page applies at the index level: a Short Straddle or Iron Condor collects richer premium when VIX is elevated.
• Low VIX makes buying options relatively cheaper — a Long Straddle or Long Strangle costs less to enter, though it also needs a genuinely large move to profit.
• The expected-move calculation above helps with strike selection — comparing a candidate strike's distance from spot against the VIX-implied expected move is a quick sanity check for how far "out there" that strike actually is.

• The expected-move calculation is a statistical estimate, not a boundary. Nifty moving outside a "1 standard deviation" range is expected roughly 32% of the time by definition — it's common, not a rare event.
• India VIX reflects the market's current pricing, not a guarantee of future volatility. Realized volatility can and does come in higher or lower than what VIX implied.
• VIX itself can move sharply around events, the same "IV crush" dynamic covered on the Implied Volatility page, just measured index-wide rather than for a single option.