Bitcoin Dominance Calculator
Projects Bitcoin's share of total crypto market capitalization after applying separate growth rates to BTC and altcoins. Use it to model how dominance shifts under bull, bear, or altseason scenarios.
About this calculator
Bitcoin dominance is the ratio of Bitcoin's market cap to the total cryptocurrency market cap, expressed as a percentage. After applying projected growth rates the formula becomes: Dominance = [BTC_cap × (1 + BTC_growth%)] / ([BTC_cap × (1 + BTC_growth%)] + [AltCap × (1 + Alt_growth%)]) × 100, where AltCap = totalCryptoMarketCap − btcMarketCap. If BTC grows faster than alts, dominance rises; if alts outpace BTC, dominance falls — the classic 'altseason' pattern. This projection helps investors anticipate whether capital is likely to rotate from BTC into smaller coins, which historically signals different portfolio strategies. Note that projected growth rates are assumptions, so run multiple scenarios to bracket the range of outcomes.
How to use
Suppose BTC market cap is $500B and total crypto market cap is $1,000B (so AltCap = $500B). You project BTC grows 20% and alts grow 50%. Step 1 — new BTC cap: $500B × 1.20 = $600B. Step 2 — new Alt cap: $500B × 1.50 = $750B. Step 3 — new total: $600B + $750B = $1,350B. Step 4 — dominance: ($600B / $1,350B) × 100 = 44.4%. Despite BTC growing 20%, its dominance fell from 50% to 44.4% because alts grew faster, illustrating a classic altseason outcome.
Frequently asked questions
What does Bitcoin dominance tell you about the crypto market?
Bitcoin dominance measures how much of the total crypto market value is held in BTC versus all other coins combined. When dominance rises it often signals that investors are moving capital into BTC as a relative safe haven within crypto, sometimes ahead of or during market downturns. When dominance falls, capital is typically rotating into altcoins in search of higher returns, a phase often called altseason. Traders watch dominance alongside price charts to time rotational strategies between BTC and altcoins.
Why does altcoin growth cause Bitcoin dominance to fall even if BTC price rises?
Dominance is a relative measure — it depends on BTC's share of the total pie, not its absolute value. If altcoins collectively grow at a faster rate than BTC, the total market cap expands more than BTC's individual cap does, shrinking BTC's percentage even though its price is higher in absolute terms. This is mathematically inevitable: a 20% BTC gain combined with a 50% altcoin gain results in BTC owning a smaller fraction of a larger market. Investors use this dynamic to identify when speculative appetite has shifted toward smaller, higher-beta assets.
How should I use Bitcoin dominance projections in my investment strategy?
Dominance projections are scenario-planning tools, not forecasts — the actual outcome depends entirely on the growth assumptions you input. By running a range of scenarios (BTC outperforms, alts outperform, both grow equally) you can stress-test your portfolio's exposure to each outcome. If your portfolio is heavily weighted toward altcoins, a rising-dominance scenario would hurt relative performance, prompting you to consider adding more BTC as a hedge. Think of the calculator as a way to make your assumptions explicit and then decide whether your current allocation is consistent with your market view.