# IV vs HV — StockMojo

> Implied vs historical volatility comparison

- Live page: https://stockmojo.in/iv-hv
- Content last updated: 2026-04-21
- Platform: StockMojo — free options analytics for Indian markets (NSE F&O)

This is a machine-readable markdown mirror of the live tool page. The live page shows real-time NSE data during market hours (09:15-15:30 IST) and supports 200+ F&O symbols via per-symbol URLs like https://stockmojo.in/iv-hv/banknifty.

## Frequently asked questions

### What is the difference between IV and HV?

Implied Volatility is forward-looking. It's the volatility figure baked into current option prices and reflects the market's expectation of future movement. Historical Volatility is backward-looking. It's the annualised standard deviation of actual past returns over a chosen window (usually 20 or 30 days). The spread between the two tells you whether options are expensive or cheap relative to what the underlying has actually been doing.

### Does IV move before HV?

Yes, almost always. IV is what traders are pricing in for the future, so it shifts the moment expectations change. HV only updates as new daily returns get added to the rolling window, so it lags by several sessions. This is why an IV spike ahead of an event is a leading signal. By the time HV catches up, the move has often already happened. Watching IV against a trailing HV line is one of the cleanest ways to anticipate volatility regime changes.

### What does it mean when IV is higher than HV?

IV above HV means option premium is rich — the market is pricing in more future volatility than has been realized recently. This is the statistical edge for option sellers, and strategies like short strangles, iron condors, and covered calls have favourable expected value when IV-HV is positive and meaningful.

### What does it mean when IV drops below HV?

IV below HV is unusual and means options are cheap relative to recent realized movement. It's a green light for long-volatility strategies (long straddles, backspreads) and a warning for option sellers that they're being underpaid for risk. Sustained IV-HV compression often precedes breakouts.

### What is a typical IV-HV spread for Nifty?

Nifty typically runs with IV about 1-3 percentage points above HV — a small volatility risk premium reflecting event uncertainty. Spreads above 5 points usually signal event anticipation (budget, RBI policy, results) and revert after the event. Spreads below HV are rare and mark exceptional buying opportunities for long-volatility trades.

### How does IV-HV behave around stock earnings?

For single stocks, IV-HV widens dramatically in the days before earnings — often 10-20 points above HV — as traders bid up premium to hedge or speculate on the announcement. After earnings, IV 'crushes' back to normal levels while HV catches up slowly as the realized move gets averaged in. This is the classic pre/post-earnings IV dynamic.

### Can I use IV-HV to pick strike prices?

Indirectly. IV-HV tells you whether the whole option chain is rich or cheap — it's a macro filter for strategy selection rather than a per-strike picker. Combine it with volatility skew (for strike-level pricing) and OI distribution (for support/resistance) to pick specific strikes within the bias IV-HV suggests.

## How to use the IV vs HV chart

1. **Pick an underlying** — Select Nifty, BankNifty, or an F&O stock to compare implied versus historical volatility for.
2. **Compare the lines** — IV is the forward-looking line; HV is the backward-looking line. Look at the current vertical gap between them.
3. **Evaluate the spread** — A positive spread (IV > HV) favours premium-selling. A negative or near-zero spread favours premium-buying or long-volatility strategies.
4. **Check historical context** — Scan how the spread has behaved over recent months. Is today's spread normal for this stock, or an outlier?
5. **Pick a strategy** — Elevated IV-HV spread → short strangles, iron condors, credit spreads. Compressed IV-HV → long straddles, backspreads, debit spreads.

## Related tools

- [IV Chart](https://stockmojo.in/iv-chart) — markdown: https://stockmojo.in/iv-chart.md
- [Volatility Skew](https://stockmojo.in/volatility-skew) — markdown: https://stockmojo.in/volatility-skew.md
- [IV Grid Screener](https://stockmojo.in/iv-grid) — markdown: https://stockmojo.in/iv-grid.md

## Glossary

Terms used: implied-volatility, historical-volatility, volatility-premium. Definitions: https://stockmojo.in/glossary