How to read crypto market cap
Market cap is a coin's price multiplied by how many coins are in circulation. It matters because it shows a coin's total size, which the price alone hides. A coin priced at a fraction of a cent can be larger than one priced at hundreds of dollars, because supply differs hugely. To compare coins sensibly, look at market cap, not just price.
One of the most common mistakes new crypto watchers make is judging a coin by its price. A coin at a fraction of a cent looks cheap, one at tens of thousands of dollars looks expensive, but price alone tells you almost nothing about a coin's size. The number that does is market cap. Here is what it means, how it is calculated, and how to use it to compare coins without being fooled by price.
What market cap is
Market capitalization, or market cap, is simply a coin's current price multiplied by the number of coins in circulation. If a coin trades at two dollars and there are one billion of them in circulation, its market cap is two billion dollars. That figure represents the total market value of all the coins that exist and are circulating, which is a far better measure of a coin's size and importance than its per-coin price.
This is why market cap is the standard way coins are ranked and compared. When you see crypto assets listed by size, they are ordered by market cap, not price. It is the closest single number to how big a coin is in the market, which is what most people are asking when they wonder whether a coin is large or small.
Why a low price does not mean cheap
Here is the trap that catches everyone at first. Because market cap is price times supply, two coins with wildly different prices can have similar or even reversed sizes, depending on how many coins exist. A coin at a fraction of a cent with a trillion coins in circulation can have a larger market cap than a coin at hundreds of dollars with only a few million coins. The low price feels cheap, but the coin can be enormous.
So a coin being priced low is not the same as it being cheap or having room to grow, and a high price is not the same as expensive. What matters is the market cap, the total value, and the supply behind the price. Judging a coin by its per-coin number alone is like judging a company by its share price without knowing how many shares exist, it tells you almost nothing on its own.
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As a rule of thumb, larger market caps tend to mean more established, more liquid, and somewhat less volatile coins, while smaller market caps tend to mean younger, thinner, more volatile ones, with more room to move in both directions. This is a generalization, not a guarantee, but it is a far more useful first read on a coin than its price. When you see a coin's size described as large-cap or small-cap, this is the scale being referred to.
One nuance to know: you will sometimes see a fully diluted market cap, which uses the maximum possible supply rather than what is circulating now, which can be much larger. Knowing the difference between circulating and total supply matters here, and our supply guide covers it. To watch the price that feeds the calculation, CoinNotch keeps any coin in your menu bar.