Overview
Implied volatility describes the level of future price movement that the options market is pricing into an option at a given moment. In practical terms, it is not a record of what the market has already done. It is a forward-looking measure of how much movement market participants expect may happen over the life of the option.
What it means in practice
In live markets, implied volatility helps show how much uncertainty is being priced before a move actually happens. When implied volatility is higher, option premiums are usually richer because the market is pricing a wider expected range of movement. When implied volatility is lower, option premiums are usually lighter because the market is pricing a narrower expected range. This often reflects changing expectations around event risk, market uncertainty, and potential movement rather than a fixed view on direction.
Why it matters in live markets
Implied volatility helps explain why option prices can change even when the underlying market has not moved very far. It is especially useful when thinking about option premiums, expected range, event pricing, realised volatility, and broader market uncertainty, because all of those concepts sit around how future movement is being priced in advance.
Key points
• Implied volatility is the market’s priced-in expectation of future volatility
• It is forward-looking rather than a record of past movement
• Higher implied volatility usually means the market is pricing a wider expected range
Example
Ahead of a major central bank decision or earnings release, implied volatility may rise even if the underlying market is still relatively quiet. That reflects the market pricing a higher chance of larger movement once the event arrives, rather than reacting only after the move has already happened.
Related glossary terms
Volatility, Realised Volatility, Option Premium, Risk Sentiment, Liquidity