Crypto market capitalization estimates an asset’s value at current prices; Bitcoin dominance measures Bitcoin’s share of a provider’s defined crypto market. One is an absolute valuation estimate, the other a relative percentage. Neither tells you how much cash entered the market or predicts what prices will do.
What is crypto market capitalization?
For an individual cryptoasset, market capitalization is generally calculated as:
Market capitalization = current price × circulating supply
For example, if a token trades at $2 and a provider estimates 10 million units are circulating, its circulating market cap is $20 million. That is a valuation at the current price, not a count of dollars invested.
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A provider’s global or total crypto market cap is an aggregate over the assets it tracks or includes under its requirements. Since providers may use different asset coverage, prices, and supply estimates, their totals—and Bitcoin dominance readings calculated from those totals—can differ.
What is Bitcoin dominance?
Bitcoin dominance expresses Bitcoin’s market cap as a percentage of the total crypto market cap defined by a particular data provider:
Bitcoin dominance = Bitcoin market capitalization ÷ provider-defined total crypto market capitalization × 100
If Bitcoin accounts for $600 billion of a provider’s $2 trillion total crypto market, its dominance reading is 30%. The percentage describes Bitcoin’s share of that measured market, not a share of cash invested or trading activity.
CoinGecko and CoinMarketCap both define dominance as a relative market-cap share. When reporting a reading or comparing historical series, identify the provider because the denominator depends on the provider’s asset universe and methodology. Definitions are available from CoinGecko and CoinMarketCap.
How do market cap and Bitcoin dominance differ?
| Question | Market capitalization | Bitcoin dominance |
|---|---|---|
| What does it describe? | An estimated valuation for one asset, or an aggregate for a tracked market. | Bitcoin’s percentage share of a provider-defined crypto market valuation. |
| Calculation | Price multiplied by a specified supply quantity, usually circulating supply. | Bitcoin market cap divided by total crypto market cap, multiplied by 100. |
| Useful for | Comparing estimated size at prevailing prices, with the supply basis held in view. | Observing whether Bitcoin’s relative share of the measured market is increasing or decreasing. |
| Main limitation | Price and supply estimates shape the result; it is not equivalent to invested cash. | Coverage and inputs shape the denominator; the percentage alone does not explain the cause or forecast returns. |
Which supply figure is being used?
Market-cap comparisons are meaningful only when the supply basis is clear. Providers distinguish several supply concepts:
- Circulating supply: An estimate of units considered in circulation or in the public’s hands. Methods may rely on project disclosures, checks of locked balances, or other provider-specific evidence.
- Total supply: Units already created, generally net of burns under the provider’s definition. It can include tokens that are not circulating.
- Maximum supply: The maximum number of units that can exist, where a defined cap exists.
- Fully diluted valuation (FDV): A valuation using price multiplied by total supply or, under some conventions, maximum supply. Because publishers do not use “FDV” uniformly, check which supply denominator a specific figure uses.
CoinMarketCap explains its circulating, total, and maximum supply terms in its supply definitions; CoinGecko describes its approach to supply and market cap in its methodology. A circulating market cap and an FDV are not interchangeable valuations: they apply the same price to different quantities of units.
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What can a change in market cap tell you?
A market cap can rise because an asset’s price rose, its relevant supply estimate increased, or both. It does not show that an equivalent amount of cash entered the market. A change in price reprices all units included in the calculation, even though those units were not all bought at the new price. CoinGecko’s explainer notes, “Market cap is not always an accurate measure of net cash inflow.” (CoinGecko, updated April 10, 2026.)
Market cap is therefore useful as a rough measure of relative size at prevailing prices, but it cannot by itself show liquidity, the amount invested, or what an asset can be sold for in quantity. A large market cap does not guarantee that large holdings could be sold without affecting the price.
What can a change in Bitcoin dominance tell you?
A rising dominance reading means Bitcoin’s share of the provider’s measured crypto market has increased; a falling reading means its share has decreased. The formula does not identify why. For instance, dominance could rise if Bitcoin appreciates relative to other counted assets, if those assets fall relative to Bitcoin, or if the tracked universe or calculation inputs change.
Some market commentary treats falling Bitcoin dominance as a possible sign that altcoins are outperforming or that capital is rotating toward them. The percentage alone does not establish that money moved directly from Bitcoin to altcoins, nor does it guarantee an “altseason.” To assess relative performance, compare Bitcoin and other assets over the same time period, and check provider coverage and the denominator behind the reading. CoinMarketCap also notes that market-cap interpretation has critics, including concerns about dormant or lost Bitcoin; that caveat does not provide a verified estimate of how many coins are lost. See its supply glossary.
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How to use the metrics without overreading them
- Identify the provider and date. Use the same provider when comparing market totals or dominance over time, and note when the reading was observed because market data changes.
- Check the supply basis. Confirm whether a market-cap figure uses circulating supply, total supply, or maximum supply; do not compare an FDV directly with circulating market cap as if they measured the same thing.
- Read the metric as a valuation or share. Market cap describes an estimated valuation; dominance describes Bitcoin’s relative share of the provider’s total.
- Look beyond the percentage for explanations. To understand a dominance move, compare asset price performance over the same period and consider changes to the provider’s coverage or inputs. Neither metric alone measures net cash flows or forecasts future returns.
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