24-hour change and volatility – how to judge a coin's risk in one minute
Three numbers next to every cryptocurrency tell you whether the market is calm or stormy. Here is how to read the 24h change, the daily high and the daily low.
Next to every coin on an exchange or in a simulator you see three numbers: the change over 24 hours in percent, the day's highest price and the day's lowest price. Most people only look at the first one, and only to see whether it is green or red. Yet all three together tell you in a minute how much risk you are taking.
The 24-hour change
This is the difference between the price now and the price exactly one day ago, in percent. Plus 3 percent means the coin is more expensive today than it was yesterday at this time.
It is important to understand that this is a rolling window. The number changes not only because of the current price, but also because the "yesterday" price shifts every minute. A coin can stand still all day and its 24h change will still move, simply because yesterday at this time it was moving.
What you can learn from it:
- The direction over the day. Whether the market is buying or selling today.
- The mood. If all ten coins are red, it is a market-wide move, not a problem with one coin. If one is red and the others green, something happened to that coin specifically.
What you cannot learn: what happens next. A coin that rose 10 percent can rise more or give it all back. The change describes the past.
Daily high and low
These two numbers show the range the price moved in during the day. The gap between them is the simplest measure of volatility.
Example. Bitcoin: low $78,500, high $80,100. A range of $1,600, about 2 percent. A calm day. Dogecoin: low $0.145, high $0.172. A range of 18 percent. A stormy day.
High volatility means two opposite truths at once: you can earn more and you can lose more. For a beginner the second truth matters more.
How to use it in practice
- Size your position by volatility. Put less into a coin that swings 15 percent a day than into one that swings 2. That keeps your risk in dollars similar.
- Set the trigger price inside the range. A limit buy near the day's low has a realistic chance of filling. An order 20 percent below can wait for weeks.
- Do not buy at the daily high. If the current price equals the day's maximum, you are buying at the most expensive point of the day. Sometimes that is right, but more often it pays to wait.
- Notice anomalies. If a coin that normally swings 3 percent is swinging 20 today, something happened. Find out what before you buy.
Volatility and sleep
There is a simple test for whether your position is the right size: can you sleep calmly knowing the coin could drop its usual daily range overnight? If an 18 percent Dogecoin drop would make you wince at your phone in the morning, the position is too big. Reduce it until the answer is "no big deal".
In the Crypto Hills simulator all ten coins show the 24h change, high and low in real time. Compare the Bitcoin and Dogecoin ranges for a few days in a row and you will feel the difference between a calm and a stormy coin without any risk.
Three numbers, one minute, and you know what you are dealing with. It is the cheapest risk analysis there is.