Electricity in Hungary is 230V with a frequency of 50Hz, while the following plugs (and matching sockets) are being used as standard:
type C and type F
Before every use of your own electric equipment, check the label on the appliance. You can use your electric appliances in Hungary, if the standard voltage in your country is between 220-240 V (as is in the UK, Europe, Australia and most of Asia and Africa). Manufacturers take these small deviations into account.
If the standard voltage in your country is in the range of 100 V - 127 V (as is in the US, Canada and most South American countries), you need a voltage converter in order to use the device in Hungary. You can also consider a combined power plug adapter/voltage converter.
If the frequency in your country differs from the what is standard in Hungary (50 Hz), it is not advised to use your appliances. However if there is no voltage difference, you could (at your own risk) try to use the appliance for a short time. Be especially careful with moving, rotating and time related appliances like clocks, shavers and electric fan heaters.
Some electric appliances don’t need a converter. If the label states the following: 'INPUT: 100-240V, 50/60 Hz'. This appliance can be used in all countries around the world. This feature is common for chargers for tablets/laptops, photo cameras, cell phones, toothbrushes, etc.