What it means
Implied volatility (IV) is the volatility input that, when plugged into the Black-Scholes model, produces the current market price of an option. It's the market's consensus forecast of future realized volatility over the option's life.
Why it matters
IV trades like its own asset class. Selling IV when it's elevated and buying it when it's depressed is a real edge. The VIX is essentially a 30-day weighted IV across SPX options.
How to use it
Compare current IV to historical realized vol and to the IV percentile (where IV sits in its 1-year history). High IV percentile + benign realized = sell premium. Low IV percentile + upcoming catalyst = buy optionality.
Take it further
Want a worked example or a deeper dive? Ask Rocky how this concept applies to your specific watchlist or trade idea.
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