Bitcoin dominance is Bitcoin's market cap expressed as a percentage of the total cryptocurrency market cap. Traders track it under the ticker BTC.D as the standard gauge of whether capital is concentrating in Bitcoin or rotating into altcoins. It fell to roughly 39% during the 2021 altcoin run, touched 40.6% on 18 June 2017, and held above 55% through 2025 and into 2026.
The calculation
Bitcoin's market cap divided by total crypto market cap, multiplied by 100.
If Bitcoin is worth $1.7 trillion and all crypto combined is worth $3.1 trillion, dominance is about 55%. That is the whole formula, and the simplicity of it is exactly why the number gets misread so often by people who never ask what sits in the denominator.
What it measures is relative size, not absolute performance. Bitcoin can rise 20% while dominance falls, if altcoins rose 40% in the same period.
How to read it
| Dominance moving | Total market cap | What it usually means |
|---|---|---|
| Rising | Rising | New money entering crypto through Bitcoin first |
| Rising | Falling | Defensive rotation. Altcoins falling faster than Bitcoin |
| Falling | Rising | Capital rotating from Bitcoin into altcoins. The classic altseason setup |
| Falling | Falling | Bitcoin falling faster than altcoins, which is rare and usually brief |
The second column matters. As much as the first. Dominance alone tells you Bitcoin's share. Pairing it with total market cap tells you why the share moved.
The historical range
Dominance has swung between roughly 39% and above 95% across Bitcoin's history.
Before 2017, Bitcoin was most of the market, and dominance routinely sat above 80%. The 2017 ICO boom drove it down to 40.6% on 18 June 2017 as Ethereum briefly reached about 82% of Bitcoin's market cap. The 2021 cycle took it to roughly 39%, the lowest on record, as capital rotated through DeFi tokens, NFTs, and memecoins.
Since 2024 the pattern has reversed. Dominance climbed back above 55% and held there, which is unusual this deep into a cycle by historical standards.
Why dominance stayed high
Two structural changes, both dated.
ETF flows run one direction. Spot Bitcoin ETFs launched in January 2024 and drew $48.7 billion in net inflows that year and $47.2 billion in 2025. That capital enters through allocation decisions and does not rotate into smaller tokens three months later. A pension fund buying a regulated Bitcoin product is not selling it for a memecoin.
Token supply exploded. More than 20,000 assets now trade. The same rotating capital spread across ten times as many tokens produces a far weaker signal per token, and a far weaker dent in Bitcoin's share.
The result is that readings which would once have signalled the start of altseason now sit inside the mixed range.
The measurement problem
Two versions exist, and they disagree.
Including stablecoins. Total market cap counts USDT, USDC, and the rest. Stablecoins reached roughly $316 billion by June 2026, about 10% of the market, and they do not move with Bitcoin.
Excluding stablecoins. Some analysts strip them out, arguing a dollar-pegged token says nothing about risk appetite. Dominance calculated this way runs several points higher.
Neither is wrong. Check which version a chart uses before comparing readings.
What dominance does not tell you
- Nothing about direction. Rising dominance can mean Bitcoin rallying or altcoins collapsing.
- Nothing about any specific altcoin. It aggregates thousands of tokens into one number.
- Nothing predictive. It describes where capital sits now.
- Nothing about magnitude. A move from 55% to 54% and a move from 55% to 45% both read as "falling."
- Nothing that survives a definition change. Stablecoin inclusion shifts the number materially.
Where mb.io fits
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Frequently asked questions
What is Bitcoin dominance?
Bitcoin's market cap as a percentage of total crypto market cap, tracked under the ticker BTC.D. It measures whether capital is concentrating in Bitcoin or spreading into altcoins.
What is a high Bitcoin dominance?
Above 55% to 60% is high by post-2017 standards, indicating capital concentrated in Bitcoin. Before 2017, readings above 80% were normal because few alternatives existed.
What was the lowest Bitcoin dominance ever?
Roughly 39% during the 2021 altcoin run, when altcoins as a group briefly held nearly two-thirds of the entire market. It also fell to 40.6% on 18 June 2017.
Does falling dominance mean altseason?
Not by itself. Dominance can fall because Bitcoin is dropping faster than altcoins, which is a bear signal. Falling dominance alongside rising total market cap is the combination that has historically preceded altcoin outperformance.
Why has Bitcoin dominance stayed high since 2024?
Spot ETF flows channel institutional capital into Bitcoin without rotating it onward, and the number of tradable tokens has passed 20,000, spreading altcoin capital far thinner than in previous cycles.
Do stablecoins count in Bitcoin dominance?
It depends on the chart. Most include them in total market cap, which lowers dominance by several points. Some exclude them, arguing a dollar-pegged token says nothing about risk appetite.
Can Bitcoin dominance predict price moves?
No. It describes where capital currently sits relative to the rest of the market. Traders use it as context alongside other signals rather than as a forecast.
What is the difference between Bitcoin dominance and the Altcoin Season Index?
Dominance measures Bitcoin's share of total market cap. The Altcoin Season Index measures what percentage of the top 50 or 100 altcoins outperformed Bitcoin over 90 days. Both describe the same rotation from different angles.
