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

How is Dai Market Cap calculated?

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

Dai Market Capitalization in USD = Number of DAI in supply X Price of one Dai in USD

Since the price of Dai 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 Dai or predict the price of Dai.