Compare the plug shapes, voltage and frequency in Sri Lanka and Denmark, and find out which adapter you need before you travel.
Adapter required
Yes — coming from Sri Lanka, you will need a travel adapter for Denmark. Sri Lanka uses Type G plugs, and Denmark uses Type C/Type F/Type K, so the pin shapes will not fit any wall socket.
Sri Lanka (home)
Denmark (destination)
Electrical specifications in Denmark
Voltage
Frequency
More about plugs in Denmark
In Denmark, the standard power plug is Type C and Type F and Type K. The country runs on 230 volts at 50 Hz. That means wall sockets in Denmark can be one of 3 different shapes — Type C, Type F, Type K, and your plug needs to physically match the socket to fit.
Full Denmark plug guide