On crypto market, a coin dominance is a ratio of its market cap to cumulative market cap of cryptocurrencies. It's a great way to see how big a coin is relative to the whole crypto market — the value of everything is in comparison. It's calculated by dividing a coin market cap by the overall market cap of the top 125 coins and then multiplying it by 100. The result of these calculations and how it changes over time you can see on the dominance chart — calculated for you by TradingView.