Market Cap in Crypto: The Number Everyone Quotes and Almost No One Checks Properly
How market capitalisation is actually calculated, why it's a far weaker signal than it looks, and the low-cap trap it sets for less experienced buyers.
By Firoz Khan|14 September 2026|Updated 20 September 2026|7 min read
Market capitalisation gets treated as a straightforward measure of size and credibility, quoted on every ranking table without much scrutiny. The calculation behind it is genuinely simple, which is exactly why it's easier to distort than most people assume.
The calculation is simple, that's the problem
Market cap is current price multiplied by circulating supply, nothing more. For a coin with thin actual trading activity, a handful of trades at an inflated price can push the calculated market cap far above what the asset could realistically be sold for in bulk, because the figure reflects the last traded price, not the depth of demand behind it.
Circulating vs total vs max supply
Circulating supply is what's actually in the market and tradeable today. Total supply includes coins that have been created but aren't yet in circulation, often locked with the team or reserved for future release. Max supply is the absolute ceiling the protocol will ever allow to exist, if one is defined at all. A coin can look artificially scarce today while a large tranche of supply sits ready to be released later, diluting existing holders when it lands.
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Why a 'small market cap' isn't automatically a bargain
The small-cap comparison to stocks is tempting but misleading: a small-cap company usually has revenue, assets and a balance sheet underneath its share price. A small-cap token, more often than not, has none of that, its price reflects pure speculation about future adoption rather than any current fundamentals, which is a structurally different kind of bet.
The liquidity trap
A token can show a market cap of tens of millions on paper while the actual depth available to trade at that price, without moving it significantly, is a fraction of that figure. A relatively modest sell order can crash the price of a thinly traded token within minutes, which is precisely the scenario 'low market cap, huge upside' marketing tends to leave out.
A better way to use the number
Treat market cap as one input among several, alongside actual trading volume, how concentrated ownership is among a small number of wallets, and whether the project solves a problem people are demonstrably paying to use, rather than as a standalone signal of quality or safety on its own.
A reminder
The FCA risk warning still applies to higher-risk crypto content. Always assess how much risk you are willing to take before buying.
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