I see many of you asking what BTC DOM is and why it’s important in crypto. Today, I will give a brief explanation so you can better understand this indicator.

BTC Dominance (DOM) simply refers to the proportion of Bitcoin’s market capitalization within the total cryptocurrency market capitalization. For example, if Bitcoin has a market cap of $9 billion and all other altcoins combined are $1 billion, then DOM = 9 / (9+1) = 90%. This index shows Bitcoin’s dominance compared to other coins in the market.

Bitcoin is considered the “base currency” of crypto. Most people entering the market need to buy BTC or USDT first, and when altcoins drop sharply, many will shift back to Bitcoin to preserve their capital. That’s why BTC DOM is closely watched by investors.

There are usually four market scenarios: First, Bitcoin’s price rises, pulling the entire market up – this is the most ideal scenario. Second, Bitcoin increases but altcoins decrease, with funds flowing only into Bitcoin. Third, Bitcoin drops, dragging the market down – the most common scenario because “when the king is sick, the whole court wavers.” Fourth, Bitcoin moves sideways or slightly declines, while altcoins rise – at this stage, Bitcoin is regaining strength, preparing for the next rally.

When DOM increases, capital flows from altcoins into Bitcoin. At this point, altcoins find it hard to surge strongly, but projects with good products and high evaluations still have opportunities to break out. The strategy when DOM is high is to buy and hold quality altcoins, avoiding buying at too high a price. Conversely, when DOM decreases and Bitcoin’s price rises, most altcoins tend to increase more than Bitcoin, making it a good time to look for opportunities.

Looking at history, in 2016, Bitcoin accounted for over 90% of the market cap. In 2017, when ICOs exploded, DOM dropped to only 35% because Ethereum surged to 30% due to ETH’s demand for ICO participation. At the end of 2017, DOM recovered to 65% as Bitcoin hit $20,000. In mid-2018, DOM fell to 33% as whales took profits and shifted into altcoins. In subsequent years, DOM fluctuated around 50%, and in 2021, when Bitcoin rose from $3,800 to $41,000, DOM surged close to 74%.

Currently (May 2026), DOM is at 57.48%, indicating the market is gradually balancing after previous volatility. To better understand what BTC DOM is in the current market context, you should also monitor other indicators like TOTAL, TOTAL2, and DEFI. Newcomers often struggle because they don’t know how to read these indicators and lack experience in observing capital flows. Therefore, always keep an eye on DOM if you want to catch market trends.