Compatibility summary
Your Japan plug may fit in Saint Kitts and Nevis outlets, as both use at least one common plug type. Voltage differs by more than 20% — a voltage converter may be needed for some appliances.
Plug comparison
Japan plug types: A B
Saint Kitts and Nevis plug types: A B G
Both countries share at least one plug type (A B and A B G), so some plugs may work without an adapter. Check your appliance.
Voltage comparison
Japan: 100V, 50Hz
Saint Kitts and Nevis: 230V, 60Hz
Voltage converter recommended (Japan 100V vs Saint Kitts and Nevis 230V).