Bitcoin DVOL: implied volatility index explained with examples

DVOL is Deribit's bitcoin implied volatility index: it shows how much the options market expects BTC's price to swing over the next 30 days, expressed as an annualized percentage. A bitcoin DVOL reading of 40 implies a typical move of roughly ±2% a day and ±11.5% over a month. It says nothing about direction — only how big a move options buyers and sellers are pricing in. As of 2:00 PM ET on October 18, 2026, DVOL stood at 38.29, up from 36.99 a week earlier (our Deribit data).

What is DVOL?

Deribit launched the index in March 2021 (CoinDesk), by which point it had become the main venue for bitcoin options. The concept comes from equities: since 1993 Cboe has published the VIX, built from S&P 500 options and widely known as Wall Street's "fear gauge." DVOL applies the same idea to BTC options.

Deribit itself, in its index description, suggests treating DVOL as more of an "action gauge" than a fear gauge. Bitcoin traders expect violent moves to the upside as well as the downside, and calls often get bid harder than puts. A high DVOL therefore means "a big move is expected," not necessarily "panic."

There is an ether version too, ETH DVOL. On October 18, 2026 it read 53.7 (Deribit API) — the market expects noticeably larger swings in ETH than in BTC.

How the DVOL index is calculated

Simplified from Deribit's methodology, the calculation works like this:

1. Take the two option expiries that bracket 30 days — one just before, one just after.
2. For each expiry, collect out-of-the-money option prices (calls above spot, puts below). Far wings with delta under 5% and in-the-money options are dropped.
3. Derive each expiry's forward BTC price from put-call parity.
4. Turn the option prices into expected variance using the variance-swap formula — the same approach behind the VIX.
5. Interpolate the two variances to exactly 30 days, take the square root and express it as an annualized percentage.
6. The raw value is computed every second and smoothed with an exponential moving average over the last 240 points, so one odd trade cannot jolt the index.

The key takeaway: DVOL is not a sentiment survey. It is the price of insurance that market participants actually pay for.

How to convert DVOL into an expected price move

The index is annualized, but traders usually think in days, weeks or a month. Divide DVOL by the square root of the number of days in a year (bitcoin trades 365 days), then multiply by the square root of your horizon. Deribit's own rule of thumb: DVOL ÷ 20 ≈ expected daily move.

These are one-standard-deviation moves: under the textbook model, price should stay inside the range about two times out of three. Bitcoin has fatter tails than the textbook, so moves beyond two standard deviations happen more often than a normal distribution suggests.

Bitcoin implied volatility on October 18, 2026

From our data as of 2:00 PM ET on October 18, 2026:

• DVOL: 38.29, versus 36.99 a week earlier;
• Deribit BTC index price: $81,112;
• implied daily move: 38.29 / √365 ≈ ±2.0%, or about ±$1,600;
• implied 30-day move: 38.29 × √(30/365) ≈ ±11.0%, a range of roughly $72,200 to $90,000 with about two-in-three odds.

Is that high or low? Over the year since October 18, 2025, DVOL's average daily close was 43.5, and it closed below today's level on only 27% of days (our calculation from Deribit API daily data). The year's lowest close was 33.59 (September 17, 2026); the intraday high was 90.33 (February 5, 2026). In other words, the options market is pricing a calm month — a little less calm than a week ago.

For comparison, realized volatility — how much price actually moved — came to about 28.5% annualized over the past 30 days, based on daily closes of Deribit's BTC perpetual (our calculation). Options are trading slightly rich to what the market has delivered, which is normal, as explained below. Live price and other metrics are on the dashboard and in the Pulse block.

Implied vs. realized volatility

Implied volatility (IV) is the forecast baked into option prices. DVOL is 30-day forward IV.

Realized volatility (RV) is the fact: how much price actually fluctuated over a past period.

IV usually sits above RV. Option sellers take on the risk of a sharp move and want to be paid for it — the volatility risk premium. By our calculation on Deribit data, from October 2025 through September 2026 DVOL was above the following 30 days' realized volatility 65% of the time, by 3.5 points on average. In the other 35% of cases the market moved more than options had priced — and those are the episodes people remember.

Take February 5, 2026. DVOL had closed at 53.47 the day before and at 40.45 on January 30. On February 5, Deribit's BTC perpetual fell intraday from $70,573 to $59,800, and DVOL spiked to 90.33 (Deribit API). Insurance got expensive once the house was already on fire. For how such drops get amplified by forced selling, see our guide to crypto liquidations.

How traders use DVOL

• Sizing up the range. Ahead of big events — an FOMC meeting or a large options expiry — DVOL shows how much movement is already priced in. If the implied daily move is ±2%, a 1.5% dip is noise; a 6% drop is news.
• Cheap vs. expensive options. Low DVOL means cheap options, so buying protection or a bet on a big move costs less. High DVOL means expensive options, and some traders sell them to collect premium — at the risk of large losses.
• Position size and stops. If the implied daily move doubles from 2% to 4%, a 2% stop will get hit by noise. Many traders cut size when DVOL rises.
• Combining with other data. DVOL reads well alongside open interest and funding: rising leverage with low DVOL is a classic setup for a sharp move, though the direction is unknown in advance.
• Trading volatility itself. Since March 27, 2023, Deribit has listed DVOL futures settled in USDC; their P&L depends only on changes in the index, not on BTC's direction. That is a tool for experienced traders — beginners are better off simply watching the index.

Common mistakes

• Reading DVOL as direction. A rising index does not mean "a drop is coming." DVOL also climbs in bull runs as traders chase calls.
• Treating a level as a buy or sell signal. Low DVOL warns of a lull but not when it will end. Calm can last for months.
• Forgetting it is annualized. DVOL 40 does not mean "40% in a month." It means about 11.5% a month and about 2% a day.
• Trusting the range too much. Converting DVOL into "±X%" assumes a normal distribution. Bitcoin makes outsized moves more often than that model implies — February 2026 is a case in point.
• Watching one venue only. DVOL is built from Deribit options. Deribit is one of the largest crypto options venues, but other gauges exist, such as Volmex's BVIV, and they can diverge slightly.

FAQ

What is a normal DVOL level? There is no fixed norm. In the year to October 18, 2026, the average close was 43.5 and the range ran from 33.59 to an intraday 90.33. Below 40 is a calm market; above 60 is a nervous one.

Where can I check bitcoin DVOL? On Deribit's index page, through the exchange's public API, and in the Numbers section of our dashboard, updated with the rest of our market data.

How is DVOL different from the Fear & Greed Index? The Fear & Greed Index blends price, volume, social media and surveys. DVOL comes only from option prices — money traders actually pay for protection.

Does DVOL predict crashes? No. It shows how much movement is priced in. In February 2026 the index spiked during the sell-off, not before it.

More on the asset itself on our bitcoin page.

This is not investment advice.