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

How is RubyCoin Market Cap calculated?

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

RubyCoin Market Capitalization in USD = Number of RBY in supply X Price of one RubyCoin in USD

Since the price of RubyCoin 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 RubyCoin or predict the price of RubyCoin.