BTC dominance is Bitcoin’s share of the total crypto market capitalization, expressed as a percentage; market capitalization (market cap) is calculated as coin price × number of coins in circulation (circulating supply).
The BTC.D index is used to describe what share of total market capitalization belongs to BTC compared with altcoins and stablecoins.
BTC share in capitalization: why the metric exists
The crypto market consists of three major capitalization “baskets”: Bitcoin, altcoins (crypto assets other than BTC and stablecoins), and stablecoins (tokens pegged to a fiat price, for example to $). BTC.D describes the share distribution between these baskets with one number.
The metric appears in market analysis when it is necessary to compare the relative strength of BTC and the “rest of the market” regardless of whether prices are rising or falling. Example: at the same
The link between BTC.D and market regimes is discussed through market phases (accumulation, growth, distribution, decline), because BTC, altcoin, and stablecoin shares change differently in each phase; a related breakdown is available in the material on crypto market phases.
BTC.D is used to measure capitalization distribution inside the crypto market as a single percentage.
BTC.D calculation: formula and capitalization structure
The basic formula is: BTC.D (%) = (market cap BTC / total market cap) × 100. Example: if BTC capitalization equals
- Total market cap structure. Different aggregators build the calculation base differently: some include stablecoins, others exclude part of the assets, and others account for new tokens differently; because of this, BTC.D values differ between sources.
- Nature of capitalization. Market cap is recalculated from the latest trade price, not from the amount of capital actually invested; with low liquidity, even a small trading volume can noticeably change nominal capitalization.
An expanded explanation of calculation methods and typical distortions is provided in the material BTC dominance: how to read the metric correctly.
BTC.D reflects BTC’s share of calculated market capitalization and does not measure direct capital inflow.
Dominance change triggers: BTC, altcoins, stablecoins
BTC.D reflects the redistribution of capitalization shares between BTC and other market segments.
- BTC outpaces the market by capitalization. BTC’s share rises when its capitalization increases relative to altcoins: either BTC grows faster, or altcoins decline more sharply.
- Altcoins outpace BTC by capitalization. Altcoin capitalization grows faster than BTC capitalization; BTC’s share of total market cap decreases, and BTC.D falls.
- The stablecoin share rises. Stablecoin capitalization increases total market cap in the denominator; all else being equal, BTC.D decreases even without altcoin growth.
- The calculation base changes. New tokens are added to total market cap calculations, or asset accounting rules change; BTC.D shifts because the denominator changes.
Example of a share change: a move from
BTC.D movement reflects relative capitalization dynamics and changes in the calculation base.
Interpretation limits: when BTC.D does not mean price growth or an “altseason”
The dominance indicator is often read as a direct signal, but several scenarios change BTC’s share without changing the market direction.
BTC.D records the redistribution of capitalization shares and requires a breakdown by asset class for correct interpretation.
FAQ on BTC.D and Bitcoin dominance
Why do different sources show different BTC.D values?
The value depends on which assets are included in “total market cap”: stablecoin accounting, the token list in the base, and circulating supply update rules create differences in the formula denominator.
What does a rise in BTC.D mean when BTC price is falling?
A rise in BTC.D while BTC price is falling means altcoin capitalization is declining faster than BTC capitalization, so BTC’s share of total market cap increases even as BTC price decreases.
Why is a BTC.D decline not the same as altcoin growth?
BTC.D decreases when total market capitalization increases due to stablecoins or the addition of new assets; BTC’s share falls even if altcoin capitalization does not grow.
How does dominance by capitalization differ from BTC’s “trading volume share”?
BTC.D measures the share of capitalization (price × supply), while trading volume share measures the share of trading turnover over a selected period; these indicators answer different questions and do not have to move in sync.
🧾 Takeaways on BTC dominance and the BTC.D index
BTC dominance (BTC.D) is Bitcoin’s percentage share of the total crypto market capitalization; the indicator describes the distribution of shares between BTC and other crypto assets within the selected calculation base.
BTC.D limitations are linked to the market cap formula: stablecoin growth expands the denominator, and nominal capitalization under low liquidity distorts conclusions; therefore, the same share level does not describe price direction and does not prove inflow into altcoins.