What Bitcoin dominance is
Bitcoin dominance (BTC.D) is Bitcoin's share of total cryptocurrency market capitalization. If the whole market is worth $3 trillion and Bitcoin accounts for $1.8 trillion, dominance is 60%. It's a simple ratio comparing Bitcoin's market cap with the rest of the market — and because relative price moves, new supply and stablecoin issuance all shift it, reading it well means knowing what it does and doesn't measure.
Related measures follow the same formula — ETH dominance for Ethereum's share, altcoin dominance (100 minus BTC.D), and USDT dominance (USDT.D), which tracks Tether's share of total market cap specifically.
The standard readings
| Pattern | Common interpretation |
|---|---|
| Dominance rising | Bitcoin outperforming the rest of the market — often read as risk-off within crypto |
| Dominance falling, alts rising | Altcoins outperforming BTC — the altseason setup |
| Dominance falling, BTC falling | BTC weak even relative to the rest — altcoins or stablecoins holding up comparatively better |
| USDT dominance rising | Tether's market-cap share growing — often read as a defensive shift |
The second and third rows are the crucial distinction. Falling dominance alone tells you nothing bullish — it only says Bitcoin is underperforming the rest of the market, which can happen in rallies and in selloffs alike. What the rest of the market is doing at the same time decides the interpretation.
Dominance and altseason
"Altseason" — periods when altcoins broadly outperform Bitcoin — has historically coincided with meaningful declines in BTC dominance alongside rising altcoin market cap. The typical sequence runs: Bitcoin rallies first, profits rotate into large-cap alts like Ethereum and Solana, then further down the cap curve into mid- and small-caps.
Two cautions on the folklore. Specific dominance thresholds ("altseason starts below 50%") describe past cycles, not a rule the market must obey. And even in a genuine altseason, performance is uneven — rotation flows through sectors and market-cap tiers in waves, and plenty of alts miss the party entirely.
Caveats behind the ratio
- Denominator drift. New listings expand total market cap, mechanically nudging dominance down without any money moving.
- Methodology differences. Whether stablecoins are included in total market cap changes the number — different data providers print different dominance values for the same moment.
- Timeframe noise. Intraday dominance wiggles are mostly noise; the informative signal lives in daily and weekly trends.
- Individual coins first. In the short run, a coin's own catalysts usually matter more than the market-wide rotation backdrop.
Using dominance in practice
Dominance works best as a rotation map read alongside sentiment and flow measures: the Fear & Greed Index for market mood, volume for whether a move has participation, and — from Korea's side of the market — the kimchi premium, which adds context on demand from Korea's market during rotation phases. A dominance trend that agrees with those other reads is a far stronger basis for positioning than the ratio alone.