What Is Market Cap?

What is Market Cap?

Market capitalization (market cap) is the total value of an asset's units in circulation, found by multiplying the current price by the circulating supply. The concept comes from equity markets and is the most common way to compare the relative size of cryptocurrencies.

Comparing two assets by unit price alone is misleading. A $1 token and a $1,000 coin cannot be compared until supply is taken into account. Market cap removes that distortion and lets networks with very different supply designs, such as Bitcoin and Ethereum, be measured on the same scale.

How Does It Work?

Market cap is not a fixed number; it is recalculated every time the price moves. It rises when the price rises or when new tokens enter circulation, and it falls when the price falls. In other words, market cap is not money sitting in a vault. It is the last traded price applied to the whole circulating supply.

The supply figure used decides the result. The standard definition uses circulating supply. Locked tokens, treasury holdings and units not yet minted are left out; they show up in fully diluted valuation (FDV) instead.

History and Evolution

Market cap is borrowed from stock markets. Investor.gov, the investor education site of the US Securities and Exchange Commission (SEC), defines it as the current market price of one share multiplied by the total number of outstanding shares.

As the number of crypto assets grew, the same formula became the standard way to rank them by size. Crypto-specific variants followed: FDV, which counts the full supply, and realized cap, which values each coin at the price at which it last moved on-chain.

Key Concepts

• Circulating supply: units that can change hands freely right now.
• Total supply: all units minted so far, including locked ones.
• Max supply: the hard ceiling set by the protocol; 21 million for Bitcoin.
• Bitcoin dominance: Bitcoin's market cap as a share of the total crypto market cap.
• Trading volume: the value that changes hands over a period; it shows how active the market behind a market cap really is.

How Market Cap Is Calculated

The formula is simple:

Market cap = Price × Circulating supply

Example (made-up numbers): a token called "ABC" trades at $2 with 50 million tokens in circulation. Its market cap is 2 × 50,000,000 = $100 million. If the price rises to $2.50 with supply unchanged, market cap becomes $125 million. If the price stays at $2 but 10 million new tokens enter circulation, market cap also rises, to $120 million, yet this time the increase comes from supply, not demand.

That last case matters: a higher market cap does not always mean new money has flowed in.

Fully Diluted Valuation (FDV) vs Market Cap

Fully diluted valuation (FDV) multiplies the price by the maximum supply (or total supply when there is no maximum). It shows what market cap would be if every token were already circulating at today's price.

In the same example, if ABC's maximum supply is 500 million, FDV is 2 × 500,000,000 = $1 billion, ten times its market cap. The gap says that 90% of the supply has yet to reach the market. Unlock schedules and distribution rules are covered under tokenomics. When market cap and FDV are close, most of the supply is already in circulation.

Stock Market Cap vs Crypto Market Cap

A stock's market cap is its share price multiplied by shares outstanding. The logic is the same; the inputs differ:

The market cap shown on the NVIDIA (NVDA) stock price and Apple (AAPL) stock price pages is calculated this way. Equity valuation ratios such as the P/E ratio link market cap to a company's earnings; crypto has no direct equivalent.

Size Classes: Large, Mid and Small Cap

Market cap is also used to sort assets into size classes. FINRA, the US broker-dealer self-regulator, gives these approximate ranges in its investor education: mega-cap $200 billion or more, large-cap $10-200 billion, mid-cap $2-10 billion, small-cap $250 million to $2 billion and micro-cap below $250 million.

FINRA stresses that there are no fixed cut-off points and that different firms use different thresholds. Crypto has no official classification either, so "large-cap coin" can mean a different threshold depending on who is speaking.

What Market Cap Does Not Tell You

• Liquidity: a token with a large market cap but thin volume can move sharply on one big sale. The displayed value is not what could actually be sold at that price.
• Money flows: a handful of trades re-prices the entire supply.
• Ownership concentration: most of the supply may sit in a few wallets, which makes the price fragile.
• Cheap or expensive: a low market cap does not mean "cheap" and a high one does not mean "expensive". Size is not valuation.

Reading the Market Cap Label on Price Pages

On COINOTAG coin price pages, such as Bitcoin price and Ethereum price, the market cap label shows the current value calculated from price and circulating supply. On the US stocks, ETFs and commodities prices side, the same label is calculated from shares outstanding. When reading it, three things help: the 24-hour trading volume on the page, the gap to FDV where shown, and how the price compares with its all-time high.

Practical Example

Example (made-up numbers): token A trades at $50 with 20 million in circulation, a market cap of $1 billion. Token B trades at $0.05 with 30 billion in circulation, a market cap of $1.5 billion.

Someone looking at unit price might think B is "cheap", yet B is the larger asset. If A's FDV is $1.1 billion and B's FDV is $6 billion, most of B's supply is still to come. This comparison makes no valuation call; it simply describes the size and supply structure of the two tokens in the same terms.

Market cap is also used to track market phases: long stretches in which total crypto market cap keeps rising are usually described as a bull market.

Related Terms and Next Steps

Reading market cap well means looking at how supply is created (circulating supply, tokenomics), how much the asset actually trades (trading volume) and where the price sits historically. For equity-side developments, see TradFi news.