The Danish currency is the krone. Note the pretty coins with the neat hole in the middle and even hearts as part of the pattern. However, you will hardly end up seeing coins or bills as Denmark has almost fully moved to be cashless. You will easily get around Denmark with a credit card and can avoid ATMs and their fees.
How much is a krone? We recommend XE.com for currency conversion.
Make sure to also read our section on Handling Money on Tour before you travel.