India VIX

India VIX is the National Stock Exchange’s volatility index: a number, derived from NIFTY option prices, that represents the market’s expectation of annualized NIFTY volatility over the next 30 calendar days. Often called the “fear gauge”, it rises when traders bid up option premiums in anticipation of large moves — typically during sell-offs, global shocks or ahead of events like elections and budgets — and drifts lower in calm, grinding markets.

The index is computed from the order book of near-term NIFTY options across strikes, following a methodology adapted from the CBOE VIX. It is quoted in annualized percentage terms.

Example

An India VIX reading of 15 implies expected annualized volatility of 15%. Converted to a monthly figure: 15% ÷ √12 ≈ 4.3% — the option market pricing roughly a ±4.3% NIFTY range over the coming month (a one-standard-deviation estimate, not a guarantee). With NIFTY at 25,000, that is about ±1,080 points. If VIX jumps to 24, the implied monthly range widens to roughly ±6.9%, and option premiums across the chain inflate accordingly. Hypothetical readings.

Why it matters

For systematic options traders, India VIX is a regime filter. Premium-selling strategies such as straddles collect more when VIX is high but face bigger adverse moves; buying strategies suffer in low-VIX chop. Encoding a VIX threshold — for example, standing aside or resizing when VIX exceeds a level — is a common, testable rule, and backtests should always be examined across both low- and high-VIX periods.

In INDfolio AI, volatility-regime conditions can be part of a strategy’s rules and validated on historical NSE data — see Options backtesting.