Crypto market cap explained
How crypto market cap is calculated
Think of crypto market cap as the total value of a cryptocurrency at the prices you'd see right now. You get it by multiplying the current price of one coin by the number of coins in circulation. This circulating supply is just the coins available and moving in the market today. People use this number often when they want to gauge the scale of a digital currency, but it's always just a snapshot in time.
Say, for example, a coin has 10 million in circulation and trades at 5 euros per coin. That would put its market cap at 50 million euros. These numbers are invented just to show how it works. Both circulating supply and price can change minute to minute, so market cap does too. Market cap is commonly used to rank altcoins, see our explainer on what altcoins are if you're interested in details there.
Circulating, total and fully diluted supply
You won't find every coin out there on the market. Some are locked for developers, are waiting to be released, or have other restrictions. Total supply is the count for every coin that currently exists, regardless of whether you can buy it. Circulating supply looks only at what's available to trade now. If you see a "fully diluted valuation," that's the current price times the maximum total coins that could ever exist, so it can be much higher than the regular market cap you see listed most places.
Sites might pick different ways to define these supplies, so their numbers for a coin's market cap might not match. Take a careful look at what supply figure a ranking page is using before you put too much trust in a single number.
The limits of ranking coins by market cap
Market cap lets you get a fast sense of which coins are big, but that's about it. It doesn't tell you how safe, stable or functional a coin might be going forward. Just because a coin ranks high on market cap doesn't mean it will hold its price, especially if the supply numbers are uncertain or the tokens are tough to resell.
A coin's market cap doesn't cover anything about its tech, team or regulatory status. There’s also liquidity, the ease of buying or selling at a fair price, to consider. If a coin trades thinly (that is, the order book has few buyers or sellers), a big-looking cap might not stop slippage from affecting your trades (that’s when actual prices end up worse than you expected). Crypto markets can move fast, and losses, even on large coins, do happen. Take market cap as one reference point, nothing more.
Frequently asked questions
Is a higher market cap better?
No, not always. A higher market cap usually shows that a coin is bigger and traded more often, which can mean easier transactions and sometimes better liquidity. But a high market cap does not confirm that the coin is safe, practical or likely to appreciate. These numbers change all the time, and even major coins can see sharp drops.
Where can I check a coin's market cap?
You can see market cap figures on a range of crypto data sites or sometimes on the coin's own exchange page. The important part is comparing how those sites work out the supply they use for their calculations, the reliability of market cap depends entirely on that raw supply number. When you need to be sure, have a look at a project’s official documents or check the numbers on a blockchain explorer.