Market CapitalisationMarket cap
Market capitalisation is the total market value of a company's shares: the share price multiplied by the number of shares outstanding.
A $500 share is not necessarily a bigger company than a $5 share. Market capitalisation — share price times shares outstanding — is how markets measure a company’s size. It decides which index a stock belongs to, how liquid and volatile it tends to be, and how much a given amount of buying can move it. In crypto, the same idea is applied to coins, with some important twists. This entry explains the calculation, the size bands, and the common misreadings.
- Category
- Fundamentals and Macroeconomics
- Reading time
- 5 min
- Also called
- Market capitalization, Crypto market cap, Large cap
- Updated
Market capitalisation in plain words
Multiply the share price by the number of shares.1 A company with 200 million shares at $50 has a market cap of $10 billion. That is what the market currently values the whole company’s equity at.
Share price alone tells you nothing about size. A $500 stock with 10 million shares ($5 billion) is smaller than a $50 stock with 200 million shares ($10 billion).
How to use market capitalisation, step by step
Find shares outstanding
Company filings and data providers list the current share count.
Multiply by the share price
Market cap changes every time the price does.
Place it in a size band
Common rough bands are mega, large, mid, small and micro caps; the exact thresholds differ between index providers.
Consider the free float
Shares held by insiders or governments may never trade; free-float market cap counts only the shares available. See Float Rotation.
Compare with enterprise value
Market cap ignores debt and cash; enterprise value adds them. See Enterprise Value.
Use it for context
Size affects liquidity, volatility and how news moves the price. See Liquidity.
Worked examples
Example 1 — Price vs. size
SizeCompany A: $500 a share, 10 million shares. Company B: $50 a share, 200 million shares.
| Company A | $500 × 10M = $5 billion |
| Company B | $50 × 200M = $10 billion |
The cheaper share belongs to the company twice the size. Compare market caps, not share prices.
Example 2 — A stock split does not change it
SplitCompany A splits 10-for-1: it now has 100 million shares at $50.2
| Market cap before | $5 billion |
| Market cap after | $50 × 100M = $5 billion |
A split changes the price per share and the share count, not the value of the company. See Stock Split and Reverse Split.
Example 3 — Crypto market cap and dilution
DilutionA token trades at $2 with 500 million tokens circulating and a maximum supply of 5 billion.
| Circulating market cap | $2 × 500M = $1 billion |
| Fully diluted valuation | $2 × 5B = $10 billion |
If the remaining 4.5 billion tokens are released, the price must fall a lot unless demand grows tenfold. See Fully Diluted Valuation and Vesting Schedule.
Rough size bands (definitions vary)
| Aspect | Approximate market cap | Typical traits |
|---|---|---|
| Mega cap | Hundreds of billions and above | Very liquid; heavily researched |
| Large cap | Roughly $10 billion and above | Liquid; index heavyweights |
| Mid cap | Roughly $2–10 billion | Balance of growth and stability |
| Small cap | Roughly $300 million–$2 billion | More volatile; less coverage |
| Micro cap | Below about $300 million | Thin trading; higher manipulation risk |
Why traders look at market cap
Liquidity expectations
Larger companies usually trade with tighter spreads and deeper books. See Bid-Ask Spread.
Volatility expectations
Small caps tend to move more, in both directions. See Volatility.
Index membership
Many indices weight members by (free-float) market cap, so size drives index flows.
Crypto rankings
Coins are ranked by market cap; also check circulating vs. maximum supply. See Circulating, Total and Max Supply.
Advantages and disadvantages
Advantages
- Simple, comparable measure of company size.
- Updates in real time with the share price.
- Useful shorthand for liquidity and risk.
Disadvantages
- Ignores debt and cash (use enterprise value for that).
- Says nothing about whether a company is cheap or expensive.
- Crypto market caps can be inflated by low float and illiquid trading.
- Size bands are conventions, not fixed rules.
Going deeper
Read as far as you need. Each level builds on the one before it.
Market cap is not cash
Beginner
A $10 billion market cap does not mean anyone could sell all the shares for $10 billion. Selling that many shares would push the price down a long way.
Free float
Intermediate
When founders, governments or other companies hold large blocks that rarely trade, the free float is smaller than the share count. Index providers often weight by free-float market cap for that reason.
Crypto caveats
Advanced
A coin’s market cap multiplies the last price by the circulating supply. If only a small amount trades, or most tokens are locked, a small amount of buying can create a very large “market cap” that could never be realised. Compare market cap with trading volume and liquidity. See Tokenomics.
Common mistakes
Judging size by share price
Always compare market caps.
Thinking a low price means room to grow
A $0.01 token with a trillion tokens can already have a huge market cap.
Ignoring dilution
New shares or token unlocks increase supply. See Share Dilution.
Equating market cap with value
It is the market’s current price for the equity, not a measure of whether that price is fair.
Check your understanding
Test yourself before moving on. Each answer comes with an explanation.
Key points to remember
- Market cap = share price × shares outstanding.
- Compare companies by market cap, not share price.
- Size affects liquidity, volatility and index membership.
- Market cap ignores debt and cash; enterprise value includes them.
- In crypto, check circulating vs. maximum supply.
Frequently asked questions
Is a higher market cap better?
Does market cap include debt?
What is the difference between market cap and fully diluted valuation in crypto?
Further learning
- Liquidity
Why size usually means easier trading.
- Volatility
Why smaller companies tend to move more.
- Stablecoin
Market cap in crypto’s most-used coins.
- Bull Market
How broad, cap-weighted indices define market phases.
Sources
This article is written in our own words. The sources below support the specific facts, rules and figures marked with a number in the text. Links open the original publisher’s page.
- Investor.gov (SEC). Market Capitalization (glossary) (opens in a new tab) Checked .
- Investor.gov (SEC). Stock Split (glossary) (opens in a new tab) Checked .
Read more elsewhere
- Investopedia: Market Capitalization (opens in a new tab)
Educational content, not financial advice. Examples use hypothetical prices and simplified costs; actual fees, margin rules and regulations vary by broker, market and country. We are not affiliated with any publisher linked above. Last reviewed . Report an error or request a source credit.