Volatility Impact Calculator.
Understand IV Crush Before It Hits.
Model exactly how implied volatility changes affect your options position — before and after the event.
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Understanding Vega
This chart demonstrates Vega risk. Notice how the option price increases as Implied Volatility (IV) goes up, even if the stock price stays the same.
- Dark Indigo Line: Current timeframe. High sensitivity to Volatility.
- Light Blue Dashed Line: Near expiry. Volatility matters less because there is little "Time Value" left to inflate.
Frequently Asked Questions
What is IV crush and how does it affect options?▾
IV crush is the sharp drop in implied volatility (IV) after a major event like earnings. Before earnings IV might be 100%; after the announcement it drops to 30-40%. This destroys option premium — even if the stock moved your way, the Vega loss can outweigh the Delta gain. Options buyers are hurt; sellers profit from IV crush.
How does implied volatility affect option prices?▾
Higher IV means more expensive options. Vega measures this relationship: a Vega of 0.20 means the option gains $0.20 for every 1% rise in IV. A 10% IV rise on a Vega 0.20 option adds $2.00 to its value. IV is driven by expected uncertainty — earnings, macro events, and market fear all push IV higher.
What is a good IV rank for selling options?▾
Sell options when IV rank is above 50% (options are expensive relative to history). Ideal is 60-80% IV rank — you're collecting inflated premium that tends to revert to normal levels. Avoid selling options when IV rank is below 30% (premium is thin and reward doesn't justify the risk).
How do I use this volatility calculator?▾
Enter your option details (underlying price, strike, expiry, current IV). Then adjust the IV slider to see how your option's value changes at different volatility levels. This shows your Vega exposure — how much you gain or lose per 1% change in IV. Use it before earnings to estimate IV crush impact.