Compare the plug shapes, voltage and frequency in Saint Kitts and Nevis and Fiji, and find out which adapter you need before you travel.
Adapter required
Yes — coming from Saint Kitts and Nevis, you will need a travel adapter for Fiji. Saint Kitts and Nevis uses Type A/Type B/Type G plugs, and Fiji uses Type I, so the pin shapes will not fit any wall socket. The mains frequency is also different (60 Hz vs 50 Hz). This rarely matters for electronics but can affect motor-driven devices like clocks and shavers.
Frequency differs (60 Hz vs 50 Hz). Rarely an issue for most electronics, but can affect motor-driven devices like clocks and shavers.
Saint Kitts and Nevis (home)
Fiji (destination)
Electrical specifications in Fiji
Voltage
Frequency
More about plugs in Fiji
In Fiji, the standard power plug is Type I. The country runs on 240 volts at 50 Hz. That means every wall socket in Fiji is the same shape — Type I, and your plug needs to physically match the socket to fit.
Full Fiji plug guide