You can check out above graph to see how the market cap of EOS has changed over time. The market cap value depends on the value of EOS on that particular day and number of EOS in supply at that day.

How is EOS Market Cap calculated?

The EOS Market cap is calculated using a simple formula. You can find it below:

EOS Market Capitalization in USD = Number of EOS in supply X Price of one EOS in USD

Since the price of EOS is highly volatile you can see the market cap going up and down a lot. Sometimes price and market cap are not linear to each other due to increase in the supply of coins in the market and stable or decrease in the price of the coin. So you can say that it's not simple to predict the market cap of EOS or predict the price of EOS.