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Implied volatility is the number that decides whether an option is cheap or expensive — and it's the one most new traders ignore right up until it wipes out a winning trade. The good news: the idea behind it is simple, and one picture makes it stick.
Implied volatility (IV) is the market's forecast of how big a stock's move will be — the expected size of the swing — baked into the price of its options. High IV = expensive options and a large expected move. Low IV = cheap options and a calm expected move. Crucially, IV measures the size of the move, not the direction.
You can't measure future volatility directly — it hasn't happened yet. So the market works backward: it takes the actual price people are paying for an option right now and solves for the volatility number that would justify that price. That back-solved figure is the volatility the price implies — hence implied volatility. In plain terms: IV is expensive options translated into a percentage. When demand for options rises, prices rise, and IV rises with them.
This is the part that trips people up. A high IV does not mean the stock is going up, and it doesn't mean it's going down. It means the market expects a big move either way. That's why the expected-move cone above fans out symmetrically. If you're bullish, IV doesn't confirm you — it just tells you how much you're paying for the ticket and how far the crowd thinks the stock could travel.
| Low IV | High IV | |
|---|---|---|
| Option prices | Cheap | Expensive |
| Expected move | Small / calm | Large / jumpy |
| Good for… | Buyers (you pay less) | Sellers (you collect more) |
| Main risk | Move may be too small to profit | IV crush — premium deflates when it drops |
| Typical when… | Quiet, no catalyst | Before earnings / events / market fear |
A raw IV of 45% means nothing on its own — it might be sky-high for a sleepy utility and dirt-cheap for a biotech. That's what IV Rank (and IV Percentile) fix: they compare today's IV to that same stock's own range over the past year. High IV Rank = options are expensive relative to this stock's history; low IV Rank = cheap. It's the difference between "45%" and "the most expensive this stock's options have been all year."
The most common way IV burns traders is around earnings. IV inflates before the report (nobody knows the outcome), then collapses the instant it's public. Buy a call into that spike and the stock can rise on the news while your option still loses — because the IV you paid for evaporated. That exact mechanism, with the math, is broken down here:
It depends which side you're on. High IV makes options expensive — good for sellers collecting rich premium, risky for buyers who pay up and face IV crush when volatility falls. Low IV means cheap options, better for buyers. Neither is inherently good or bad; it decides who has the edge.
No. IV measures the expected size of the move, not its direction. High IV means the market expects a big move either way — which is why the expected-move range is symmetric around the current price.
There's no universal number — a normal IV for a quiet stock is high for another. Traders use IV Rank or IV Percentile, which compare today's IV to that same stock's past year. High IV Rank means expensive relative to its own history; low means cheap.
Uncertainty. IV rises ahead of earnings, events, big news, or broad market fear (the VIX is basically IV on the S&P 500). When the uncertainty resolves, IV usually collapses — the IV crush that hurts option buyers.
We flag when IV is rich or cheap before the trade in the free Discord — so you're not the one buying the top of the volatility spike. 3,600 traders, wins and losses posted. See it before you risk a cent.