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What Is Implied Volatility? (Explained Like You're 5)

 


Step 1: Imagine a Weather Guesser

Picture two towns.

In Town A, the weather is almost always the same: sunny, 75 degrees, every single day. Nobody worries about the forecast because tomorrow will probably look just like today.

In Town B, the weather goes wild. One day it's sunny, the next it's a thunderstorm, then it snows, then it's sunny again. Nobody really knows what's coming.

If you had to guess how big tomorrow's weather swing might be in each town, you'd guess a small swing for Town A and a big swing for Town B.

Implied volatility (IV) is that same kind of guess — but for a stock's price, not the weather.

Step 2: Stocks Have "Calm" Days and "Wild" Days Too

Look at the picture you shared. It's a table of stocks, and one whole section is labeled "Volatility."

Some stocks are like Town A — calm and boring:

  • EWC (iShares MSCI Canada ETF) has a Current IV30 of just 12.8. That's a low number, meaning traders expect small, gentle price moves.

Some stocks are like Town B — wild and jumpy:

  • ETHT (ProShares Ultra Ether ETF) has a Current IV30 of 104.0. That's a huge number, meaning traders expect big, scary swings up or down.

So just by looking at that one number, you can tell which stocks are "sleepy" and which ones are "hyper."

Step 3: Where Does This Guess Come From?

Here's the fun part — nobody measures implied volatility directly, like you'd measure temperature with a thermometer. Instead, it's backed out of options prices.

Think of an option like a coupon that lets you buy or sell a stock later at a set price. If a lot of people are nervous or excited about a stock, they'll pay more for that coupon — because the price might move a lot, and a big move makes the coupon more valuable.

So:

  • Expensive options → traders expect big price swings → high implied volatility
  • Cheap options → traders expect small price swings → low implied volatility

It's called "implied" because we're not told the volatility directly — we figure it out (it's implied) from how much people are paying for options.

Step 4: "IV30" Just Means "Guess for the Next 30 Days"

In your table, the column says "Current IV30." The "30" just means this is the market's best guess for how wiggly the stock will be over the next 30 days.

For example:

  • SHEL (Shell) has an IV30 of 21.2 — pretty calm.
  • GENI (Genius Sports) has an IV30 of 58.3 — much more jumpy.

Step 5: Comparing the Guess to Reality (Historical Vol)

Your table also has two other columns: 20-Day Historical Vol and 1-Year Historical Vol. These aren't guesses — they're what actually happened to the stock's price in the past.

You can compare them to implied volatility like checking a weather forecaster's report card:

  • If implied vol (the forecast) is much higher than historical vol (what actually happened), traders think something exciting is about to happen — maybe an earnings report or big news.
  • If they're close, traders think the future will probably look like the past.

Look at DKNG (DraftKings): Current IV30 is 50.3, while its 1-Year Historical Vol is 50.7 — almost the same! That means the market's forecast matches what's normally happened.

Now look at PCOR (Procore Technologies): Current IV30 is 47.5, but its 1-Year Historical Vol is 48.9 — again pretty close, but with a 20-Day Historical Vol of 54.3, meaning it's actually been a bit calmer than its recent 20-day self.

Step 6: The "% Rank" — Is Today Calm or Crazy... For THIS Stock?

Here's a tricky bit made simple: a big number doesn't always mean "very volatile right now." It might just mean "that stock is always kind of wild."

That's why the table has an "IV30 % Rank" column. This compares today's implied volatility to that same stock's volatility over the past year — like asking, "Is today a calm day or a stormy day, for Town B specifically?"

Almost every stock in your picture shows 35% for this rank. That means today's implied volatility is lower than it's been on 65% of days in the past year — so despite some of these stocks having big raw IV30 numbers, right now is actually a relatively calmer moment for most of them.

Step 7: Put It All Together

So next time you see a giant table like this one, here's your simple decoder:

  1. Current IV30 = the market's guess for how bumpy the ride will be over the next 30 days
  2. Historical Vol = how bumpy the ride actually was
  3. IV30 % Rank = whether today's guess is calm or extreme compared to that stock's own normal
  4. Earnings/Events column = a heads-up for why volatility might spike — like SHEL's earnings on 29-Oct-2026, which could shake up its normally-calm 21.2 IV30

The One-Sentence Summary

Implied volatility is the stock market's way of guessing how big a stock's price swings will be — the higher the number, the wilder the ride everyone expects.

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