Lodging: The cheapest room for two (in a hostel) can be rented for 62 EUR per day. Staying in a three-star hotel will cost 140 EUR or more.
Dining: A restaurant dinner for one costs about 260 DKK, a buffet in a café 75-110 DKK, and a pub breakfast set from 150 DKK.
According to reviews, when vacationing in Copenhagen, transportation costs are a serious expense for unprepared travelers. The best way to get around would be by bike, as transportation is expensive and traffic jams are not uncommon in the center.
Entertainment is the most unpredictable expense during a Copenhagen vacation. They depend not only on whether you are planning a vacation for two in Copenhagen, or going with children, or going to Denmark with a large group. The main thing is exactly how you plan to spend your time, and even here the price range can be very large. Even something as trivial as a excursion can cost 30 DKK or 300 DKK.
