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What is market capitalisation?

4 mins
Beginners Investing
Table of Contents

Key takeaways #

  • Market capitalisation = current price × circulating supply. It measures the total value of a crypto asset, not its unit price.
  • Price per coin is nearly meaningless on its own — market cap is the number that lets you compare assets.
  • Bitcoin dominance (Bitcoin’s share of total crypto market cap) is a widely watched gauge of market sentiment.
  • Market cap has limits: circulating supply figures can be disputed, and fully diluted valuations can paint a very different picture.

What is market capitalisation? It’s the total value of a crypto asset: the current price of one coin multiplied by how many of them exist and trade today. You’ll see it shortened to “market cap” on every price tracker, and it’s one of the most useful — and most misused — numbers in crypto. This guide explains what it means, why it matters more than price, and where it falls down.

Definition #

In traditional finance, market capitalisation is the value of a company’s outstanding shares. Crypto borrows the idea: market cap = price × circulating supply — the current price of one coin multiplied by how many coins exist and are tradeable today.

This gives a clear indicator of the relative size of different crypto assets. Bitcoin routinely holds the largest market cap of any cryptocurrency — often around half the value of the entire market — which is why it’s treated as the market’s anchor.

Why market cap matters more than price #

The price of a single coin tells you almost nothing on its own. A coin trading at $0.50 can be worth vastly more in total than a coin trading at $500, simply because there are far more of them in circulation. Comparing coins by unit price is like comparing companies by their share price while ignoring how many shares exist — it’s meaningless.

Market cap is what lets you answer the useful questions: how big is this asset really, how much money is actually invested in it, and how does it rank against its competitors? When you look at a price list on CoinGecko or CoinMarketCap, sort by market cap rather than price.

Bitcoin dominance #

Bitcoin dominance is Bitcoin’s market cap as a percentage of the total cryptocurrency market cap. It’s watched closely as a sentiment gauge:

  • Rising dominance often signals investors rotating out of smaller assets (“altcoins”) into Bitcoin, which is perceived as the safer option during uncertainty. Bitcoin is the market’s reserve asset — the first and largest blockchain, and the base trading pair across most of the industry.
  • Falling dominance usually means money is flowing into altcoins, which tends to happen during more speculative, risk-hungry periods.

Limitations of market capitalisation #

Treat market cap as a starting point, not a verdict:

  • Circulating supply is an estimate. Different trackers disagree on what counts as “circulating”, and locked, lost or treasury-held coins muddy the figure.
  • Fully diluted valuation matters too. Many projects have large amounts of coins yet to be released. An asset can look cheap on market cap but be heavily diluted once all supply hits the market.
  • Liquidity isn’t captured. A large market cap with thin trading volume means the number is theoretical — you couldn’t actually sell at that price.
  • It measures size, not quality. Use it alongside trading volume, on-chain activity and development activity. Our crypto resources guide lists trackers that show these metrics.

Frequently asked questions #

Can market cap go up without the price going up? Yes — if new coins are issued into circulation, market cap rises even at a flat price. That’s why dilution matters.

Is a bigger market cap safer? Generally, larger assets are more established and more liquid, so they tend to be less volatile than small caps. But “less volatile” in crypto still means wild swings by share-market standards — no market cap makes an asset safe.

Where can I check market cap? Free trackers like CoinGecko and CoinMarketCap list market caps, circulating supply and volume for thousands of assets — see our crypto resources guide for more.

What’s a “large cap” crypto? Roughly: Bitcoin and Ethereum are their own tier; large caps are the top handful of assets, mid caps the next few dozen, and everything else is small cap — with correspondingly higher risk and volatility. Our investment strategies guide covers how to weight a portfolio across those tiers.