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What is implied volatility, in simple terms?

Implied volatility is the market's guess at how much a stock will move. When it's high, option premiums are high. When it's low, they're low.

Options guide · 5-minute read · Updated 2026-10-26

The short answer

Implied volatility, or IV, is the size of move the market expects from a stock over the next year, shown as a percent. It's worked out from option prices. A stock with an IV of 20% is expected to move less than one with an IV of 60%.

People call it the market's fear gauge. When traders are nervous about big moves, they pay more for options, and IV goes up.

Why it matters to sellers

Option sellers are paid to take on the risk of a move. The bigger the move the market expects, the more it pays.

So IV drives the premium:

• High IV: bigger premiums. The market expects big swings.
• Low IV: smaller premiums. The market expects calm.

A big premium isn't a bargain. It's the market telling you the stock could move a lot. That's the risk you're being paid for.

One example (an illustration, not a trade idea)

A made-up stock, XYZ, trades at $50. You look at a 30-day $45 put. Here's roughly what it might pay at two IV levels (made-up, round numbers):

Say you sell the high-IV put for $1.50 and collect $150.

When IV changes

IV isn't fixed. It moves:

• Before earnings, IV usually climbs. Traders expect a big move on the report.
• After earnings, IV often drops fast. That's called IV crush. See IV crush explained.
• In a market sell-off, IV across most stocks jumps.
• In calm markets, it drifts lower.

A falling IV helps a seller: the option you sold loses value even if the stock doesn't move. A rising IV hurts: the option gains value even if the stock is flat.

High IV or low IV: which is better to sell?

Neither is free. In the wheel strategy, many sellers look for a stock they'd own anyway, then check whether its IV is high or low for that stock.

• A calm stock with high IV for itself often means news is coming. Find out what.
• A wild stock with normal IV still pays a big premium, because big moves are normal for it. See the Tesla wheel page for what that looks like.

Always ask: why is the premium this big? If you can't answer, don't sell.

A quick check before you sell

1. Find the stock's IV on your broker's Options chain.
2. Compare it with where it usually sits for that stock. Many brokers show an IV rank or percentile for this.
3. Look for the reason: an earnings date, a big event, or a shaky market.
4. Work out the loss if the stock falls to where the premium says it might. If that number would hurt, the trade is too big.

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