Bitcoin's Volatility Is Half What It Was in 2018, Its Shocks Are Not

Bitcoin's annualized volatility has run at about 46% so far in 2026, a little over half the 84% it averaged in 2018. The quiet is real and it is measurable. What it has not done is remove the outliers. By one count published overnight on Saturday, bitcoin has had 10 trading days this year with moves of at least three standard deviations, against eight across all of 2018, a year it finished down 73%. The price itself barely moved: bitcoin was near $82,700 on Saturday morning, up less than half a percent on the day, after closing the week 2.6% lower.

How the count is made

A three-sigma day is a session whose move is at least three times bitcoin's preceding 30-day realized volatility, the variance actually recorded rather than the variance traders expect. Direction does not matter. Under a normal distribution about 95% of moves would land inside two sigma and 99.7% inside three, so ten in nine months is a lot of tail.

The method is CoinDesk's and so is the count. Its markets desk posted the numbers at 05:43 UTC on Saturday, under a URL dated the day before. Four other outlets carried them inside three hours and none recalculated anything. This is one desk's analysis, not a dataset anybody else published.

Where the 47% figure points

Two accounts of the same work carry a 47% reading and they mean different things by it. CoinDesk puts bitcoin's volatility since 2024 at about 47%, close to Nvidia's, while counting 26 three-sigma days for bitcoin against eight for Nvidia, 16 for the S&P 500 and 12 for gold. TokenPost, carrying the analysis early on Saturday, says volatility was about 47% on 5 October. One is a two-and-a-half-year average and the other a single session. They do not reconcile, and neither account says which is meant.

There is a second gap in the comparison. The 2026 count covers nine months and a bit, the 2018 count covers twelve. TokenPost is the only one of the four carriers to point that out.

The desks selling the calm

Falling 30-, 90- and 180-day volatility feeds straight into how much risk a fund is permitted to carry. Value-at-risk models size positions off recent variance, so a calmer tape licenses a larger one. That is the part the analysis quotes people pushing back on.

"Standard VaR measures do not properly assess the full tail risk," said Luuk Strijers, chief executive of the options exchange Deribit.

Strijers pointed to expected shortfall, which averages the losses past a threshold instead of marking it, and said three-sigma risk can be hedged with bitcoin options. Positioning is crowded already. Alexander S. Blume of Two Prime, an SEC-registered investment adviser, said call overwriting is a highly crowded trade; that strategy sells calls against a holding for income and gives up its cushion when the price jumps. Deribit's book has shown the appetite before, in a $2.5 billion options spread built around $72,000.

One year on from 10 October

Saturday was the anniversary of the worst day crypto derivatives have recorded. CoinDesk has put liquidations on 10 October 2025 at more than $19 billion, a figure no other desk has published and one this site has flagged before. Nothing of the kind happened this week. Bitcoin held above $82,000 through Saturday morning after short-term holders sold at a loss on Thursday, and ZebPay's weekly tally put the Friday close at $82,681 against $84,880 a week earlier.

The most recent three-sigma day on the list is 21 September, which CoinDesk ties to a record $6.7 billion of options trades facilitated by the liquidity network Paradigm. That volume figure appears nowhere else. Nicolas Quatravaux, who runs Paradigm's business in Europe, the Middle East and Africa, said the pattern of long quiet stretches followed by sharp repricings has not changed, and that no desk he had heard of took a bad hit in these episodes. Whether that survives the next one is open. The models that let a desk scale up in a 46% tape are the models Strijers says miss the tail.