India VIX
NSE's real-time fear gauge — the market's consensus on how wildly Nifty will swing over the next 30 days.
Definition
India VIX (Volatility Index India) is a real-time index computed by the National Stock Exchange (NSE) that measures the market's expectation of Nifty 50 volatility over the next 30 calendar days. It is derived using the CBOE VIX methodology applied to Nifty option bid-ask quotes across near and next-month expiries. The result is expressed as an annualised percentage — a reading of 15 means the market expects roughly 15 percent annualised volatility, or about 4.3 percent movement over the next 30 days. Unlike implied volatility on a single strike, India VIX aggregates information from a wide strip of out-of-the-money options, making it a model-free measure of expected risk.
Why it matters
India VIX is the single most-watched sentiment indicator for NSE derivatives traders. When VIX rises sharply — as it does ahead of Union Budget announcements, RBI policy decisions, state election results, or global macro shocks — option premiums across all strikes inflate simultaneously. This raises the cost of buying protection and increases the risk of short-option positions being stopped out. Conversely, when VIX is subdued, premiums compress and option selling strategies (short straddles, iron condors) tend to perform well because the market is paying less for insurance. Directional traders also use VIX as a regime filter: low VIX trending markets often reward momentum strategies, while high VIX environments call for mean-reversion caution. A spike in India VIX without a corresponding large move in Nifty spot is itself a signal — it suggests demand for protective puts has risen sharply, often from institutions hedging large long portfolios.
How it works
NSE samples the best bid and ask of Nifty options with at least one day to expiry across a range of strikes. For each strike, it computes a contribution to expected variance weighted by the square of the strike distance and the bid-ask midpoint. These contributions are summed over the two nearest expiry series, interpolated to a constant 30-day horizon, and the square root of the result is annualised to produce the VIX reading. The calculation runs every 30 seconds during market hours (9:15 AM to 3:30 PM IST). NSE publishes the index live on its website, and it is widely available on trading terminals and data feeds.
Example
Suppose India VIX closes at 12 on a quiet Monday. On Tuesday morning, a surprise RBI commentary causes VIX to spike to 20 by 10 AM IST. A trader who sold a Nifty 50 straddle at ₹300 the previous day now sees its value surge to ₹480 — not because Nifty moved much, but purely because the implied 30-day risk expectation jumped by two-thirds. This illustrates how India VIX directly drives vega P&L on all open option positions simultaneously. All numbers are illustrative.
Track India VIX alongside the chain
TradePulse displays live India VIX next to the Nifty option chain so you can see how fear is priced into each strike in real time.