# Implied Volatility Chart — StockMojo

> Intraday ATM implied volatility solved from option premiums, plotted vs the future per expiry

- Live page: https://stockmojo.in/implied-volatility-chart
- Content last updated: 2026-06-08
- 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/implied-volatility-chart/banknifty.

## Frequently asked questions

### What does the Implied Volatility Chart show?

It plots intraday at-the-money (ATM) implied volatility for an index or stock. For every minute of the session, IV is back-solved from the ATM call and put premiums and overlaid with the underlying future price, so you can watch volatility expand and contract in real time.

### How is the ATM IV computed?

Each minute's ATM call/put premium is fed into the Black-Scholes model against the synthetic future (Strike + Call − Put), with the risk-free rate set to zero because the synthetic future already embeds carry. The volatility input that reproduces the observed premium is the implied volatility. The same solver powers the option chain and vega analysis tools.

### Why is there only one IV line and not separate call and put IV?

When the option is priced against the synthetic future with rate zero, put-call parity forces the call IV and the put IV to be identical at the ATM strike. Plotting both would just draw the same line twice, so a single IV line is used.

### How does this differ from the IV/HV/IVP Chart?

The IV/HV/IVP Chart shows daily end-of-day implied volatility with IV Rank, IV Percentile and historical volatility over months. This tool is intraday and per-expiry — it tracks ATM IV minute by minute through a single session, which is what you need for timing trades within the day.

### What is IV crush and can I see it here?

IV crush is the rapid collapse of implied volatility after an event resolves the uncertainty that inflated it. On this chart it shows as a sharp drop in the IV line, often within minutes of a policy decision, budget speech, or result. Watching it live helps option buyers avoid the crush and helps sellers capture it.

### Does live mode update automatically?

Yes. In live mode the chart refetches ATM IV roughly once a minute through NSE market hours and redraws the latest point. Historical mode lets you replay any past trading day for the selected expiry.

### Why does IV get noisy near expiry?

As time to expiry shrinks toward zero, tiny premium changes imply large volatility swings, so the solve becomes unstable in the last minutes of an expiry-day option. Extreme, non-physical readings are dropped to keep the line clean, but late-expiry IV should still be read with caution.

### How should I use intraday IV in trading?

Rising IV means options are getting richer — be cautious buying, and consider that the move may be event-driven. Falling IV favours premium sellers as extrinsic value erodes. Comparing the IV line against the overlaid future price also reveals divergences, such as IV rising while price drifts, that often precede larger moves.

## How to use the StockMojo Implied Volatility Chart

1. **Select an underlying** — Choose Nifty, BankNifty, Sensex, or any F&O stock from the symbol selector.
2. **Pick live or historical** — Use live mode for the current session (auto-refreshing each minute) or historical mode to replay a past trading day.
3. **Choose an expiry** — Select the expiry whose ATM IV you want to track. Near-term expiries react hardest to events; far-term IV is steadier.
4. **Read the IV line** — Watch the IV line for expansion (rising premium expectations) or crush (falling). Note where current IV sits versus earlier in the session.
5. **Compare IV with the future** — Use the overlaid future price to spot divergences — for example IV climbing while price is flat, a classic pre-breakout signal.

## Related tools

- [Straddle Chart](https://stockmojo.in/straddle-chart) — markdown: https://stockmojo.in/straddle-chart.md
- [IV / HV / IVP 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

## Glossary

Terms used: implied-volatility, iv-crush, atm-straddle, synthetic-future. Definitions: https://stockmojo.in/glossary