What is market cap in crypto? It is a coin’s current price multiplied by its circulating supply. That makes it a measure of relative size, not of money invested, so compare coins by market cap rather than by price per coin.
The Crypto Market Basics hub answers the broader question of how do crypto markets work. This guide stays on one metric: what market cap is, how to calculate it, and where it misleads.
The market cap formula, step by step
Market capitalization is the price of one coin multiplied by the number of coins in circulation, as MarketCapOf defines it. Guarda writes the same thing as current price per coin × circulating supply. Kriptomat phrases it as the number of coins issued times the price of a single coin. Three wordings, one calculation.
- Take the current price. Use the price per coin shown on the data site, in the currency you want the result in.
- Find the circulating supply. Guarda describes circulating supply as the coins accessible and in active trade. For how it differs from the other supply figures, see circulating supply vs total supply vs max supply.
- Multiply the two. The result is the market cap, expressed in the same currency as the price.
Circulating supply is the right multiplier because, as StealthEX explains, only the circulating supply is really available on the market right now. Coins that are not yet in circulation do not count towards the standard figure.
Worked example: Bitcoin and Ethereum
The best way to see the formula is to run it on two real coins. The table uses the CoinMarketCap list as fetched on 2026-10-28. Both figures are a snapshot and will have moved since.
| Coin | Rank | Price | Circulating supply | Market cap | Planning use |
|---|---|---|---|---|---|
| Bitcoin (BTC) | 1 | $80,893.05 | 20,104,596 BTC | $1.62T | Fewer coins at a high price still produce the largest cap in the list. |
| Ethereum (ETH) | 2 | $2,354.75 | 122,170,166 ETH | $287.68B | A far lower price per coin, but far more coins, so size is judged by the cap. |
These figures come from the CoinMarketCap all-cryptocurrencies list.
You can check the Bitcoin row yourself. Multiplying $80,893.05 by 20,104,596 gives about $1.63T, while the listing shows $1.62T. Use your own multiplication as a sanity check and treat the listed figure as the reference.
Why a lower price does not mean a cheaper coin
Ethereum trades at a much lower price per coin than Bitcoin in the table, yet it has far more coins in circulation. A lower price per coin says nothing about value until you know how many coins share that price. Kriptomat makes the same point: price alone is not enough, and market capitalization is the more accurate measure of size.
MarketCapOf offers a useful way to see this. The price coin A would have at coin B’s market cap is B’s market cap divided by the number of A coins in circulation. A coin priced at a few cents can still carry a larger cap than one priced in the thousands. The only way to know is to multiply by supply.
Why a market cap figure is tied to a date
Both inputs move. The 2026-10-28 snapshot above shows a circulating supply of 122,170,166 ETH, so supply has grown as well as price changing. Always read a cap figure together with its date.
Supply can keep changing for a long time. Bitcoin’s circulating supply therefore keeps growing even when its price stands still.
Where you meet market cap in practice
Data sites usually put rank, market cap, price and circulating supply side by side. The CoinMarketCap list shown earlier is sorted so that Bitcoin holds rank 1 and Ethereum rank 2. When a coin is described as a top-ten coin, the ranking almost always refers to this column.
Other aggregators work from the same idea. MarketCapOf, for example, takes its crypto data from CoinGecko and applies the same price-times-supply definition to coins and to shares. That is why you can compare a coin’s market cap with a company’s, as long as you keep in mind that coins and shares are different things.
Why market cap figures differ between data sites
Two sites can show different market caps for the same coin at the same moment, because each makes its own choices about the two inputs. StealthEX notes that each crypto asset has different ways of determining its supply, so the supply count is not a single universal number.
- Price method. CoinMarketCap calculates prices as a volume-weighted average of the prices across exchanges, according to StealthEX. A site that averages differently will show a slightly different price, and so a different cap.
- Supply count. Aggregators decide for themselves which coins count as circulating. A different count gives a different cap even when the price is identical.
- Cap variant. A fully diluted market cap is based on the value of all the coins, not only the circulating ones. If a figure looks far larger than the one you saw elsewhere, check the label before assuming an error.
- Timing. Prices and supply change continuously, so a figure fetched a few minutes apart will not match.
For a fair comparison, take every coin’s market cap from the same site at the same time. Do not mix figures from different aggregators in one ranking.
Large cap versus small cap
Large cap and small cap are labels for relative size, and no official body fixes the boundaries. The thresholds are publisher conventions, so the same coin can be called mid cap by one guide and large cap by another.
- Large cap. StealthEX uses a market cap of more than $10B as its large-cap line. Both coins in the worked example clear that line by a wide margin.
- Mid cap. Guarda describes the mid-cap range as usually running from several hundred million to a couple of billion dollars. The span between that range and the $10B large-cap line is left loosely defined, which shows how much the labels vary.
- Small cap. Guarda describes small caps as coins that typically show smaller market cap figures, with higher volatility and risk. It gives no fixed threshold.
Use the labels to see roughly where a coin sits, not as a rating. If you are comparing coins, check which definition the source used before treating two lists as equivalent.
What market cap does not tell you
Market cap is a reliable shorthand for relative size, but it is a weak guide to anything else. Guarda points out that it does not consider price manipulation or the asset’s liquidity. A large cap does not mean a coin can be sold easily at that price.
It also does not show how much money has entered a coin. StealthEX stresses that a market cap of $1 billion does not mean $1 billion has flowed into that cryptocurrency, because the figure comes from multiplying the latest price by the whole supply.
In practice, use market cap to place a coin in a size tier and to compare coins fairly. Check trading activity and price behaviour separately before acting. Size is also not timing: for when to trade, see our guide to the best time to trade crypto.
Frequently asked questions
Does a coin’s market cap show how much money has been invested in it?
No. It is the latest price applied to every circulating coin, so it can be much larger than the capital that actually flowed in.
Can I work out a coin’s price from its market cap?
Yes. Divide the market cap by the number of coins in circulation. This is the reverse of the formula and is how MarketCapOf frames its price comparisons.
Is crypto market cap the same idea as stock market cap?
The arithmetic is the same: price of one unit times the number in circulation, applied to coins or to shares. The difference lies in what the units represent and how supply is counted.
Which coins rank first and second by market cap?
On the CoinMarketCap list fetched on 2026-10-28, Bitcoin ranked first and Ethereum second. Rankings can change, so check the live list.
