What volatility means
Volatility describes how much and how quickly the price of an asset changes over time. A price that moves a little each day has low volatility. A price that can rise or fall by large amounts within hours, days or weeks has high volatility. The word says nothing about direction: a sharp rise and a sharp fall are both volatile.
Cryptocurrencies are generally regarded as highly volatile compared with most traditional assets such as large-company shares, government bonds or major currencies. Moves of several percent in a single day are not unusual for Bitcoin, and smaller coins can move far more. Crypto markets also trade around the clock, every day of the year, so there is no closing bell to pause activity.
Volatility is best understood as a description of uncertainty. It tells you the range of outcomes that have been common, not which outcome will come next.
Price changes are measured as returns
To compare moves fairly, analysts convert prices into returns, which are percentage changes from one period to the next. A move from 100 to 105 is a 5 percent return. A move from 10,000 to 10,500 is also a 5 percent return, even though the dollar change is very different. Using percentages lets a cheap coin and an expensive coin be compared on the same scale.
Returns can be measured over any interval: minutes, hours, days or weeks. The choice matters. Daily returns are the most common for general discussion, but a trader looking at short-term charts may care about hourly moves, while a long-term holder may care about monthly ones.
How volatility is quantified
The standard approach is to calculate how spread out a set of returns is. The most common measure is the standard deviation of returns: a larger number means returns have been more scattered around their average, and a smaller one means they have been closer together. The calculation works on percentage returns, and the version based on past prices is known as realized volatility.
A simple illustration, using made-up numbers: suppose one asset has daily returns that mostly fall between -1 percent and +1 percent, and another has daily returns that often fall between -5 percent and +5 percent. The second has a much higher standard deviation, and an investor holding it should expect much bigger swings in the value of the position.
Volatility is often quoted as an annual figure so that different assets can be compared. Because crypto trades every day, analysts commonly scale daily figures using 365 days rather than the roughly 252 trading days used for stocks. Whatever convention is used, it should be stated alongside the number.
Historical versus expected volatility
Volatility measured from past prices is backward-looking. It describes what happened. There is also a forward-looking idea, implied volatility, which is taken from options prices and reflects what the market is pricing in for the future. The two can differ, and neither is a guarantee.
Other ways to describe swings
Standard deviation is not the only lens, and it does not capture everything people care about.
- Range: the gap between the highest and lowest price over a period, often shown on candlestick charts.
- Maximum drawdown: the largest fall from a peak to a later low, which describes the pain of a bad stretch more directly than an average spread does.
- Volatility bands: tools such as Bollinger Bands draw a channel around a moving average that widens and narrows with recent price swings.
Each answers a slightly different question, so it helps to know which one is being quoted.
Volatility clusters
Volatility is not constant. Calm periods tend to be followed by more calm, and turbulent periods by more turbulence, a pattern often called volatility clustering. Quiet stretches can be followed by sudden bursts of movement, which is one reason a figure calculated over a calm month can understate the risk of the next one.
Large moves also tend to be unevenly distributed in time. In a few days a market can move as much as it did in the previous several months. Anyone reading a single average figure should keep in mind that it can hide this unevenness.
Why crypto prices swing so much
Several features of the asset class are usually cited, and each is covered in more detail elsewhere. The market is smaller than major traditional markets, so a given amount of buying or selling can move the price further. Thin market liquidity at certain times or on certain venues makes this worse. Leverage and margin trading can force positions to close automatically, adding to moves in either direction. News, regulation and the wider macro environment can change expectations quickly. These are only listed here, not examined in depth.
Smaller assets are typically more volatile than the largest ones. A coin with a low market capitalization can be moved by comparatively modest trading.
What volatility means in practice
For a holder, volatility means the value of a position can fall sharply, sometimes by half or more, and that gains and losses can both arrive quickly. It also means that the price on the day someone needs to sell may be very different from the price they hoped for.
For a trader, volatility creates both opportunity and risk. Larger swings can mean larger gains, but they also mean larger losses, and losses can be amplified by borrowing. Concepts such as position sizing and broader risk management exist largely because of volatility, since the size of a position determines how much a given price move costs.
Volatility also affects the practical side of trading: wider spreads, faster-moving quotes and greater difficulty getting orders filled at the expected price during rapid moves.
Putting it in context
Volatility is a feature of the market, not a flaw to be solved, and it is not the same as risk of permanent loss, although the two are related. A volatile asset can recover, and it can also keep falling. Past volatility does not predict future price direction, and cryptocurrency prices can fall to very low levels. People can lose all of the money they put in, so it is sensible to consider only amounts you can afford to lose.
This article is educational and is not financial, tax or legal advice.