The danish currency is the Krone ( DKK ).
You can often pay in Euros but it's not recommended because the exchange is applied directly in the shops and the exchange rate is unfavourable.
Use this tool to convert any amount in Danish Krones

A Krone is composed by 100 øre, coins are 25 øre, 50 øre, 1, 2, 5, 10 and 20 Krones.
1, 2 and 5 Krones coins carry a hole.
Banknotes come in denominations of 50, 100, 200, 500 and 1000 Krones.