What is crypto volatility and how do you measure it?
Volatility is how much price moves. Six ways to measure it, how to work it out, and why Bitcoin's middle day (1.38%) and average day (2.10%) differ.
Crypto volatility is how much a price moves, up or down. The simplest way to measure it is to drop the plus and minus signs from each day's move, then take the middle value or the average. On Binance Bitcoin perps from September 2019 to October 2026, the middle day moved 1.38% across 2,598 days. The average day moved 2.10%, because a few huge days pull the average up.
So "how volatile is Bitcoin?" depends on which measure you pick. These are past cases, not a forecast.
For Bitcoin's daily moves year by year and its biggest days, see How much does Bitcoin move in a day?.
What is volatility?
Volatility is the size of price moves. It does not say whether the price went up or down. A coin that rose 5% and a coin that fell 5% had the same size of move.
Traders care because bigger moves mean bigger gains and bigger losses on the same trade. A stop or a margin cushion that is fine on a calm day can be too thin on a wild one. Our guide to how liquidation works shows how that plays out.
How do you measure volatility?
There is no single number. These are the common ways, from simple to more advanced.
| Measure | How it works | What it is good for |
|---|---|---|
| Average absolute move | Drop the plus and minus signs, then average the moves | A simple "typical size" |
| Median absolute move | Sort the moves and take the middle one | A normal day, not hurt by wild days |
| Range | High price minus low price over a set time, divided by the open | How far price travelled, even if it came back |
| Standard deviation | Measure how far moves sit from their average, giving big moves extra weight | The spread of returns; the base of most risk formulas |
| Average true range (ATR) | Average of recent ranges, counting gaps from the last close | Setting stop distances in the chart's own units |
| Realized volatility | Standard deviation of past returns, often scaled to a year | Comparing coins or periods on one scale |
A return is the percent change in price over one bar. A bar is the open, high, low and close price over a set time.
Realized volatility is usually shown as a yearly number. To scale a daily figure to a year, finance people multiply by the square root of the number of days in a year. We did not compute standard deviation or ATR below. We report the median and average absolute move, the range and the share of big days, which are easier to read.
How do you work out volatility yourself?
- Get daily closing prices for one coin on one exchange.
- For each day, work out the percent change from the day before.
- Drop the minus signs, so every move is a size.
- Sort the sizes and take the middle one (the median). Also take the average.
- Count the share of days above a size you care about, such as 5%.
If the average is much bigger than the median, a few wild days are doing a lot of the work.
How big is a normal day for Bitcoin and other coins?
We used daily candles, which open and close at midnight UTC. UTC is the shared world clock. Each daily move is the percent change from the last close to this close, ignoring direction.
| Market | Days | Middle move | Average move | Middle daily range | Days over 5% | Days over 10% |
|---|---|---|---|---|---|---|
| Binance BTCUSDT | 2,598 | 1.38% | 2.10% | 3.74% | 9.24% | 1.31% |
| Binance ETHUSDT | 2,518 | 1.95% | 2.86% | 4.95% | 16.72% | 3.26% |
| Binance SOLUSDT | 2,226 | 2.91% | 4.04% | 7.05% | 27.04% | 7.55% |
| Coinbase BTC-USD | 4,109 | 1.43% | 2.29% | 3.80% | 11.90% | 2.31% |
The range column is the gap between the day's high and low. On a middle day, Binance Bitcoin travelled 3.74% from low to high, even though the close only moved 1.38% from the day before. Price often goes out and comes back inside one candle. Our guide to reading a candlestick chart shows where to see that.
For Binance Bitcoin, the 90th percentile of daily moves was 4.79%. That means about one day in ten moved more than that. The 99th percentile was 10.58%.
Each average is higher than its middle value. The difference is the fat tail: a few extreme days that pull the average up. The biggest was March 12, 2020, when Bitcoin fell 39.98% in one daily candle. The biggest up day was February 8, 2021, at +19.57%.
Coinbase and Binance rows come from different markets (spot in US dollars from July 2015, and a perp in USDT from September 2019), so we show them side by side and never mix them.
Does volatility change from year to year?
Yes, a lot. Here are Binance Bitcoin daily moves by calendar year. 2019 starts in September, and 2026 runs to October 19.
| Year | Days | Middle move | Days over 5% | Days over 10% |
|---|---|---|---|---|
| 2019 | 114 | 1.26% | 7.02% | 1.75% |
| 2020 | 366 | 1.47% | 12.02% | 2.19% |
| 2021 | 365 | 2.35% | 20.27% | 2.74% |
| 2022 | 365 | 1.47% | 10.96% | 2.47% |
| 2023 | 365 | 1.00% | 5.75% | 0.27% |
| 2024 | 366 | 1.37% | 6.83% | 0.55% |
| 2025 | 365 | 1.15% | 3.84% | 0.00% |
| 2026 | 292 | 1.17% | 4.79% | 0.68% |
In 2021, one day in five moved more than 5%. In 2025, fewer than one in 20 did, and no day passed 10%. One long average hides these swings.
How does volatility change within a day and a week?
Volatility is not even through the day. We measured the average absolute move of each hourly candle for Binance Bitcoin, from September 2019 to October 2026.
- The quietest hour was 04:00 UTC, with an average hourly move of 0.30%.
- The busiest was 14:00 UTC, at 0.54%.
- The middle hourly move over all hours was 0.23%, again lower than the averages.
- Weekdays averaged 0.42% per hour. Weekends averaged 0.29%.
Saturday was the calmest day at 0.27%, and Monday the busiest at 0.44%. Our posts on the busiest hours of the day and on weekend volatility have every hour and coin.
What does this data not show?
- It does not say which way price will go. A big move can be up or down.
- It does not say whether tomorrow will be calm. It describes past years, and the years differ.
- Average and median depend on the bar size you choose. Hourly and daily numbers are not interchangeable.
- The coins are a chosen group of large survivors, not all coins.
- We did not test whether volatility predicts anything.
How we measured this
Daily numbers use completed daily candles from Binance USDT perps and Coinbase spot, labelled by their opening date. A daily move is the simple percent change from the previous daily close, so the first day of each market is skipped. The hourly numbers use completed hourly bars, with the move between each close and the one before.
We dropped two placeholder bars at the start of the Binance Bitcoin history. Four old Binance daily closes disagree with the hourly data and could not be verified, so we did not quote them. Medians use the middle value; shares count days above the stated size.
Try this in Comparand
Connect Comparand to your AI app, then ask about Hyperliquid:
- "Show Bitcoin's measured volatility and volatility label for September 1, 2026, next to ETH and SOL." The stats tool (hl_stats) returns realized volatility, a volatility regime (a label for how high it is) and a correlation matrix for up to 20 coins on one day. It costs $0.01 per call on pay as you go.
- "Get hourly bars for Bitcoin on Hyperliquid for one day, and work out the average absolute hourly move." The bars tool (hl_bars) returns price bars for one coin over the window you choose, 1 minute by default. It costs $0.005 per call on pay as you go. Your agent does the averaging. The tool does not return a report.
Plans include unlimited data tools under fair-use limits. The Hyperliquid archive is separate from the Binance numbers above, so do not compare them directly. You can try 3 coins free, read the docs, or see pricing.
The short version
- Volatility is the size of price moves, not their direction.
- Binance Bitcoin's middle daily move was 1.38% and its average 2.10%; 9.24% of days moved more than 5%.
- SOL's middle day (2.91%) was about twice Bitcoin's, and 27.04% of its days passed 5%.
- Bitcoin's middle daily move ranged from 1.00% in 2023 to 2.35% in 2021.
- These are past cases, not a forecast.
Questions people ask
What is crypto volatility?
Volatility is how much and how fast a price moves, whatever the direction. A calm coin moves a little each day. A volatile coin moves a lot.
How big is a normal day for Bitcoin?
On Binance Bitcoin perps from September 2019 to October 2026, the middle daily move, ignoring direction, was 1.38% across 2,598 days. The average was 2.10%, because a few huge days pull the average up. About 9.24% of days moved more than 5%.
Which is better for measuring volatility, the average or the median?
Neither alone. The median shows a normal day. The average includes the wild days. Bitcoin's median daily move was 1.38% and its average was 2.10%, and the gap between them tells you the big days matter.
What is realized volatility?
Realized volatility is volatility measured from past price changes, usually as the spread of returns over a window. It is often scaled to a yearly number so coins and periods can be compared.
Is Bitcoin less volatile than it used to be?
The middle daily move fell from 2.35% in 2021 to 1.00% in 2023, then rose to 1.17% in 2026 (to October 19). That is a change in past years, not a forecast.