Crypto
2 min read

Bitcoin Dominance

Bitcoin’s share of the total cryptocurrency market capitalization, expressed as a percentage. Traders watch dominance as a signal of capital rotation between BTC and altcoins.

How it's calculated

Bitcoin Dominance = Bitcoin Market Cap / Total Crypto Market Cap

Both sides come from data aggregators (CoinMarketCap, CoinGecko, TradingView). The denominator includes every tracked asset — major altcoins, stablecoins, memecoins, thousands of micro-caps. Different aggregators produce slightly different dominance numbers depending on which assets they include.

Why traders watch it

Bitcoin dominance functions as a compass for capital rotation within crypto:

  • Rising dominance — capital flowing into Bitcoin, often during risk-off periods or when Bitcoin is leading a rally before altcoins catch up.
  • Falling dominance — capital rotating into altcoins. Usually associated with altseasons and broader risk appetite.

The classic crypto cycle pattern: dominance rises early in a bull market as Bitcoin rallies first, peaks somewhere mid-cycle, falls as altcoins take leadership, and bottoms near the cycle top before reversing as the bear market begins.

Historical context

Bitcoin dominance was nearly 100% before Ethereum launched in 2015. It dropped to around 38% during the January 2018 ICO-driven peak, when thousands of new tokens absorbed capital. It bottomed in the mid-30s during 2021's altcoin and DeFi surge. By early 2025 it had risen back into the 50–60% range, reflecting Bitcoin's outsized share of institutional flows and ETF inflows.

What it doesn't mean

Several common misreadings:

  • High dominance ≠ Bitcoin doing well. Dominance can rise simply because altcoins are falling faster than Bitcoin during a downturn. The 2022 bear saw Bitcoin dominance rise even though Bitcoin's price was crashing.
  • Low dominance ≠ Bitcoin doing poorly. During strong altseasons, altcoins outperform Bitcoin, but Bitcoin can still be rallying in absolute terms.
  • Stablecoin distortion. As stablecoin market cap has grown to $200B+, it mechanically reduces Bitcoin dominance even though stablecoin growth says nothing about altcoin demand. Some analysts use a "Bitcoin dominance ex-stablecoins" measure to filter this out.

In broader market analysis

Dominance is one input among several. Traders also watch:

  • ETH/BTC ratio — Ethereum's price in Bitcoin terms. A leading indicator that often turns up before broader altcoin strength.
  • Altcoin Season Index — measures whether 75% of top-50 altcoins have outperformed Bitcoin recently.
  • Total altcoin market cap (TOTAL2) — Total crypto cap minus Bitcoin. Looks directly at altcoin aggregate behavior.
  • Total crypto cap minus Bitcoin and Ethereum (TOTAL3) — even more focused on the long tail.

Each lens captures slightly different rotation dynamics, and traders typically use them together rather than relying on dominance alone.