A crypto asset can have a market capitalisation of £1bn without £1bn of cash being paid into it. Market cap is an implied valuation: it applies the current price to every token counted as circulating.
That makes market cap useful for comparing the relative size of crypto assets. It does not tell you how much cash a project holds, how much investors collectively paid, or how much every holder could receive if they sold.
How crypto market cap is calculated
The usual calculation is:
Current price × circulating supply = market capitalisation
Suppose a token has 100 million units in circulation.
- At £10 per token, its market cap is £1bn.
- At £11 per token, its market cap is £1.1bn.
The market cap has risen by £100m. That does not prove £100m of new money entered the asset.
Why the numbers can move by different amounts
Only a portion of the circulating supply needs to trade for the quoted price to change. Once the price used in the calculation moves from £10 to £11, that new price is applied to all 100 million circulating tokens.
In other words, the £100m increase is a change in implied value, not a record of £100m changing hands. The actual value traded over a period is measured separately as trading volume.
Market cap can also change when circulating supply changes. Token unlocks, new issuance or tokens entering public circulation can increase the supply used in the calculation. Reductions in circulating supply can work in the other direction. The reported figure therefore depends on both price and supply data.
What a £1bn market cap does not mean
A £1bn market cap does not automatically mean:
- the project holds £1bn in cash or reserves;
- investors have collectively deposited exactly £1bn;
- £1bn is available for holders to withdraw;
- every circulating token could be sold at the displayed price;
- the asset is liquid, widely held or high quality.
Market cap answers a narrower question: what is the circulating supply worth if every circulating unit is valued at the current reference price?
Why liquidity matters
Liquidity describes how easily an asset can be bought or sold without materially moving its price. A crypto asset can show a large market cap and still have limited liquidity.
Imagine many holders try to sell at once. The available buyers at the displayed price may be exhausted quickly. Sellers may then receive lower prices for later trades. The difference between the expected price and the execution price is known as slippage.
This is why market cap should not be treated as immediately realisable value. The screen may value every circulating token at £11, but the market may not absorb a large wave of selling at that price.
Five figures that answer different questions
Market capitalisation
Current price multiplied by circulating supply. It helps compare relative size.
Trading volume
The value traded during a stated period, often 24 hours. It describes activity, not the total value of the asset.
Liquidity
How easily trades can be completed without causing a large price change. Market cap does not measure this directly.
Fully diluted valuation
An estimate based on the current price and a broader total or maximum supply, depending on the data provider. It can highlight how much supply is not yet circulating, but it remains a hypothetical valuation at today’s price.
Holder concentration
How much of the supply is controlled by a small number of wallets or entities. Market cap alone does not reveal this distribution.
A clearer way to read crypto headlines
When a headline says £500m was “added” to or “wiped from” a crypto asset, it usually describes a change in market cap. Read that as a change in implied valuation rather than proof that the same amount of cash entered or left.
Then ask:
- Did the price change, the circulating supply change, or both?
- How much value actually traded?
- How liquid were the relevant markets?
- Is there a large gap between market cap and fully diluted valuation?
- Is ownership concentrated?
- What weight does the asset have in the overall portfolio?
The practical meaning
Market cap is a useful comparison tool, but it is only one part of the picture. It shows the circulating supply valued at the current price. It does not measure cash held, invested capital, liquidity, project quality or the amount that could be realised in a large sale.
Keeping those distinctions separate makes market-cap headlines easier to understand and helps place a crypto position in clearer portfolio context.
