What Is Bitcoin Dominance? How to Calculate and Read It

Say the whole crypto market is worth $2,000 billion, and Bitcoin alone is worth $1,000 billion of it. That gives Bitcoin a 50% share, called Bitcoin dominance.

Traders watch it to see whether money is favouring Bitcoin or the rest of the market. All the figures in this lesson are round numbers for illustration.

How Bitcoin dominance is calculated

Start with market cap, short for market capitalisation. For one coin, it is the price times the number of coins in circulation. If Bitcoin trades at $50,000 and 20 million coins circulate, its market cap is $1,000 billion.

Add up the market caps of every coin a data site tracks, and you get the total crypto market cap. Bitcoin dominance is Bitcoin's market cap divided by that total, times 100.

With $1,000 billion for Bitcoin and $2,000 billion for the market, that is 1,000 ÷ 2,000 × 100 = 50%. In this example the other $1,000 billion splits into $800 billion of altcoins and $200 billion of stablecoins.

A bar for the total crypto market worth $2,000 billion, split into Bitcoin at $1,000 billion, altcoins at $800 billion and stablecoins at $200 billion, giving Bitcoin dominance of 50%. — Dominance is Bitcoin's slice of the whole market.

Altcoins here means every coin other than Bitcoin and the stablecoins. Stablecoins are tokens built to hold a steady value, usually one US dollar.

What makes dominance rise or fall

Dominance is a ratio, so it moves when Bitcoin does better or worse than the rest of the market. Bitcoin's price can rise while its dominance falls.

Take the starting market above and change it in three ways:

Bitcoin rises 20% and nothing else moves. Bitcoin is now $1,200 billion of a $2,200 billion market: 1,200 ÷ 2,200 = 54.5%.
Altcoins rise 50% and nothing else moves. Altcoins go from $800 billion to $1,200 billion, so all other coins, stablecoins included, come to $1,400 billion and the market to $2,400 billion. Bitcoin's share is 1,000 ÷ 2,400 = 41.7%.
Both happen together. Bitcoin is $1,200 billion of $2,600 billion, or 46.2%, so dominance falls even though Bitcoin rose 20%.

Four stacked bars in billions of dollars: the start with Bitcoin at 1,000 and other coins at 1,000 for 50.0% dominance, Bitcoin up 20% for 54.5%, altcoins up 50% for 41.7%, and both moves together for 46.2%. — Dominance compares Bitcoin with everything else, so either side can move it.

The third case surprises people most. A rising Bitcoin with falling dominance usually means other coins are rising faster.

Why stablecoins distort the reading

Stablecoins hold their value when everything else falls. That can move dominance in a crash, even when Bitcoin and altcoins fall by exactly the same amount.

Start again from the 50% market and cut Bitcoin and altcoins in half. Bitcoin drops to $500 billion and altcoins to $400 billion, while stablecoins stay at $200 billion. The total is now $1,100 billion.

Bitcoin dominance is now 500 ÷ 1,100 = 45.5%. It fell 4.5 points, yet Bitcoin did exactly as well as altcoins. The whole drop came from stablecoins holding still.

Some charts publish dominance without stablecoins to fix this. Before the crash it is 1,000 ÷ 1,800 = 55.6%, and after it 500 ÷ 900 = 55.6%. That version shows no change, which is the honest answer here.

Two stacked bars before and after a 50% fall in Bitcoin and altcoins, with dominance dropping from 50.0% to 45.5% when stablecoins are counted and staying at 55.6% when they are left out. — Stablecoins holding their value can pull dominance down in a crash.

Other ways the number can mislead

Different data sites track different lists of coins. Each new token they add enlarges the total, so two sites can show dominance a few points apart on the same day.

Market cap also flatters thinly traded coins. A token with 1 billion units at $1 shows a $1 billion market cap, yet selling a small part could crash its price. Liquidity decides what a market cap is really worth.

The coin count itself is an estimate. Bitcoin's circulating supply includes coins that are probably gone for good, such as those in wallets whose owners lost their private keys.

How traders read Bitcoin dominance

Traders read dominance together with price. Each combination says something different about where money is going within crypto.

When Bitcoin rises and dominance rises, money is gathering in Bitcoin. This has often happened early in a rally, or when traders want crypto exposure with less risk than smaller coins carry.

When the market rises and dominance falls, money is rotating into altcoins. A long stretch of this is often called altcoin season, and it has tended to come late in past market cycles.

When dominance falls in a crash, check stablecoins before you conclude anything. As the example showed, a falling market alone can drag the figure down.

Dominance describes what has already happened. It does not forecast, and a trend in it can run for months after it looks stretched.

A useful second view is the ETH/BTC price ratio, which compares ether, the largest altcoin by market cap in most years since 2017, with Bitcoin directly. Stablecoins play no part in it.

Questions

What is a high Bitcoin dominance?

There is no fixed level. Compare a reading with its own history on the same data site, and check whether that site counts stablecoins.

Why does Bitcoin dominance fall when Bitcoin is rising?

Other coins are rising faster. Bitcoin's share of the total shrinks even while its own price climbs.

Does Bitcoin dominance include stablecoins?

On the large market data sites it does, because they count stablecoins in the total crypto market cap. Some charts publish a version without them, which shows rotation between volatile coins more clearly.

Where can I see Bitcoin dominance?

Most crypto market data sites and charting platforms publish it, often under a symbol such as BTC.D. Their figures differ a little because each counts a different list of coins.