Crypto Decoded

What is market cap in crypto, and why can it mislead people?

Crypto market cap is a useful shortcut, but it is not money invested. Learn what it measures, why it can mislead and what to check instead.

By Oliver Crane · May 25, 2026

Market cap is one of the first numbers people latch onto in crypto. It feels like a quick way to tell whether something is “big” or “small”. The problem is that it is easy to misunderstand, and even easier to game.

Reviewed by Sarah Okafor, Editor · May 25, 2026, 21:46

In this article

The Short Version

Market cap is price multiplied by circulating supply, not the amount of money “in” a coin.
In crypto, circulating supply is sometimes a best estimate, and different trackers can disagree.
Fully diluted valuation (FDV) matters when most tokens are locked or will be minted later.
A high market cap can still be illiquid, meaning a small trade can move the price a lot.
Use market cap alongside volume, liquidity and token unlocks, not as a standalone verdict.

What market cap is (and what it is not)

At its simplest, market capitalisation is:

Market cap = token price × circulating supply

That is useful because it helps you compare projects on a like-for-like basis. A token priced at £2 is not automatically “more expensive” than one priced at 2p. If the 2p token has a much larger circulating supply, its market cap can be bigger.

Where people go wrong is assuming market cap is the same thing as “how much money has been invested”. It is not. Market cap is a snapshot of what the market is currently valuing the circulating tokens at, based on the latest trades.

That distinction matters in crypto because prices can move a lot on relatively little trading. In thin markets, the last traded price can be dragged up or down, and market cap moves with it.

Circulating supply is not always a clean number

In traditional markets, share counts are formal and tightly tracked. In crypto, supply is more complicated. Many tokens have:

tokens locked for founders, teams or investors
vesting schedules that release supply over time
tokens held in treasuries or reserves
bridged or wrapped versions across different chains

Because of that, “circulating supply” often means “the portion of tokens that data providers believe is freely tradable right now”. For some assets it is straightforward. For others it involves judgment calls, and different trackers can legitimately produce different circulating supply figures.

When you see a market cap, it is worth remembering it is only as solid as the assumptions underneath it.

FDV and low float: the trap behind some big numbers

You will sometimes see a token with a modest market cap but an enormous fully diluted valuation (FDV). FDV is the same basic calculation, but it uses the maximum supply (or total supply) rather than circulating supply.

This matters because a token can look “small” today, even though a huge amount of new supply is scheduled to hit the market over the next few years. If demand does not grow at the same pace, that new supply can put downward pressure on the price.

Low float tokens can also create the opposite illusion. If only a small percentage of tokens is circulating, it can be easier for a relatively small amount of buying to push the price up. That inflates market cap quickly, even though most tokens are still locked and cannot be sold.

Liquidity and volume: why market cap does not equal tradability

Market cap tells you nothing about how easy it is to buy or sell without moving the price. That is the job of liquidity and trading volume.

If you want a plain English feel for liquidity, imagine a market stall. If the stall is busy (lots of buyers and sellers), you can usually trade at close to the quoted price. If it is quiet, one person turning up with a large order can shift the price dramatically.

Crypto markets can have large market caps on paper while still being hard to trade in size. If this topic is new, it is worth reading our explainer on what liquidity means in crypto, because it changes how you interpret almost every headline number.

Market cap can mislead in bull runs and panics

In a rising market, market caps expand fast because price rises are amplified by the supply multiplier. That can make whole sectors look like they have “arrived” overnight, even if the underlying usage has not changed much.

In a sell-off, the reverse happens. Market caps can shrink brutally, even if the project’s technology, users or long-term thesis is unchanged. This is one reason people talk about crypto in market cycles rather than in straight lines.

Market cap is still useful here, but it works best as a context number. It helps you see whether an asset is a niche corner of the market or one of the larger players, not whether it is “safe” or “good value”.

A Worked Example

Let’s use two imaginary tokens to show how market cap can mislead if you stop too early.

Token A trades at £2. There are 100 million tokens circulating. Its market cap is:

£2 × 100,000,000 = £200 million

Token A’s maximum supply is 1 billion tokens, with the remaining 900 million locked and scheduled to unlock over four years. Its FDV would be:

£2 × 1,000,000,000 = £2 billion

Token B trades at 20p. There are 2 billion tokens circulating. Its market cap is:

£0.20 × 2,000,000,000 = £400 million

Token B looks “cheaper” per coin, but it is actually the bigger asset by market cap. Token A looks mid-sized, but its FDV suggests a much larger long-run supply story. If you ignored FDV and unlocks, you could miss a major risk factor for Token A.

Now add liquidity. If Token A trades on a small exchange with low daily volume, a single big buy can lift the price, and market cap rises instantly. That does not mean £200 million of new money has entered. It means the last traded price moved.

What This Means For You

Market cap is not useless. It is a quick way to compare scale, and it helps you sanity-check claims. If someone describes a token as “tiny” but it has a multi-billion market cap, you know what they are really doing: selling a narrative.

The safer way to use market cap is as one input in a small checklist:

Check supply assumptions: is circulating supply clearly defined, and does it match across major trackers?
Look at FDV and unlocks: are large token releases scheduled, and could that change the market over time?
Look at liquidity and volume: could the price be moved easily by a few trades?

If you do this, you will make fewer mistakes in both directions: you will be less likely to dismiss something just because the price per coin is low, and less likely to be impressed by a market cap that is mostly a product of low float and thin trading.

In Plain English

Market cap is a rough “size label”, not a bank balance. It is price times supply, and in crypto both parts of that equation can be messier than they look.

For live data definitions, CoinGecko’s methodology explains how supply, price and market data are handled. The FCA cryptoassets page is also worth reading before treating any market-size number as an investment signal.

This article is for general crypto education only. It is not financial advice or personal investment advice. Cryptoassets are volatile, and you may get back less than you put in.