Bitcoin dominance is Bitcoin’s share of total crypto market capitalization. It appears in the ticker at the top of every page on this site. It is also one of the most confidently misused numbers in crypto commentary.

What it measures

One division: Bitcoin’s market cap over the market cap of everything. If Bitcoin is $1.2 trillion of a $2.4 trillion market, dominance is 50%. That is the whole calculation.

What makes it interesting is that it is a relative measure. It can rise while Bitcoin falls, if altcoins fall faster. It can fall while Bitcoin rises, if altcoins rise faster. Every reading has at least two possible explanations, and the number alone does not distinguish them.

The four states, and why direction alone is not enough

Pair dominance with Bitcoin’s own price and there are four situations, not two:

  • Dominance up, Bitcoin up — money entering the sector is going to Bitcoin first. Typical early in a cycle.
  • Dominance up, Bitcoin down — a risk-off market. Everything is falling and altcoins are falling harder. This is not bullish for Bitcoin; it is less bad.
  • Dominance down, Bitcoin up — the condition people call altcoin season. Capital is rotating outward while the base asset holds.
  • Dominance down, Bitcoin down — usually a late-cycle unwind, or a specific altcoin narrative pulling money sideways in a weak market.

Announcing “dominance is falling, so altcoin season” without checking which of the two falling states applies is the single most common error. Two of the four states have dominance moving in the same direction for opposite reasons.

Stablecoins quietly distort it

Total market cap includes stablecoins, and stablecoin supply has grown into a very large share of the market. That creates a mechanical effect worth understanding: when traders sell into stablecoins during a downturn, total market cap falls less than it otherwise would, which suppresses Bitcoin dominance even though nothing rotated into altcoins.

Some analysts strip stablecoins out for this reason. We do not adjust the headline figure — it is the standard definition and comparability matters — but it is why dominance readings from different eras are not perfectly comparable.

What to use it for

Dominance is a decent measure of where risk appetite sits within crypto, and a poor timing tool. It has no threshold that reliably marks a turn, despite the round numbers people attach significance to. It trends for long stretches and those trends end without warning.

The useful version is comparative: look at dominance alongside the market heatmap, which shows whether a move is broad or concentrated. Falling dominance plus a heatmap that is green across the small caps is a genuine rotation. Falling dominance plus a red heatmap is something else entirely, and the label “altcoin season” would be actively misleading.

Check it against sector performance too. If one corner of the market is running while the rest is flat, dominance will fall for reasons that have nothing to do with a broad appetite for risk.

Nothing here is financial advice. See our risk disclaimer.