Travel Utility
World Power Plug & Adapter Guide
Check the plug type, voltage and frequency at your destination and know exactly whether you need an adapter or a voltage converter.
From
Type B
United States
120 V
60 Hz
Two flat pins + round grounding pin. North America grounded.
To
Type G
United Kingdom
230 V
50 Hz
Three rectangular blades. UK, Ireland, Malta, Malaysia, Singapore.
Adapter check: United States → United Kingdom
You will need a plug adapter: United States uses Type B (120 V), while United Kingdom uses Type G (230 V).
⚠ Voltage differs. Check that your device supports 120 V and 230 V; many modern chargers are dual-voltage (100–240 V) but hair dryers and older electronics may not be.
Why plug and voltage knowledge is essential travel prep
Few travel moments are more frustrating than arriving in a country and finding you cannot charge anything. Sockets differ in shape, the voltage behind them differs in magnitude, and the alternating current runs at a different frequency. A little preparation — knowing your destination's plug type, voltage and frequency — turns a potential trip-ruiner into a non-event.
This guide explains the 13 plug types in use worldwide, the two main voltage families (100–127 V and 220–240 V), and how to decide whether you need a simple plug adapter or a full voltage converter.
The two global voltage families
The world splits roughly into two voltage systems. The 100–127 V family is used in North America, parts of South America, Japan and a few others. The 220–240 V family covers Europe, most of Asia, Africa, Oceania and much of South America. The difference is large enough that a single-voltage device from one family will not safely run on the other.
Frequency divides similarly: 60 Hz in North America and parts of Japan and South America, 50 Hz across most of the rest of the world. Japan is unusual in using both 50 Hz (east) and 60 Hz (west) at 100 V.
Dual-voltage devices
Almost all modern phone and laptop chargers, camera batteries and USB power supplies are rated 100–240 V, 50/60 Hz — meaning they work everywhere with only a plug adapter. The rating is printed in tiny text on the brick. If you see that range, you are safe worldwide.
Single-voltage devices
Hair dryers, straighteners, older shavers and some kitchen appliances are often single-voltage. Plugging a 120 V hair dryer into a 230 V outlet will destroy it and can be dangerous. For these, you need a voltage converter rated for the device's wattage, or simply buy a local version.
The 13 plug types explained
The IEC defines 13 plug types, labelled A through N. Type A and B are the flat-pin plugs of North America; C is the round-pin Europlug found across Europe and much of Asia; E and F are the round-pin grounded plugs of France and Germany; G is the three-square-pin plug of the UK; I is the angled pins of Australia, New Zealand and China.
Most travellers do not need to memorise the letters. A universal travel adapter — one that physically converts between the common types — covers the vast majority of destinations. The risk is not the plug shape but the voltage behind it, which is why the voltage check matters more than the plug check.
Choosing the right adapter
For a single destination, a single plug adapter matching that country's type is the cheapest, smallest option. For multi-country travel, a universal adapter that slides out different pin configurations is more convenient, though it is bulkier. Some universal adapters also include USB ports, letting you charge phones directly without a separate charger brick.
Avoid the cheapest no-name adapters for high-wattage devices: a poorly made adapter can overheat. For anything drawing significant power (a laptop under load, a hair dryer), use a quality adapter and never a lightweight travel converter rated far below the device's wattage.
Voltage converters: when you actually need one
You need a voltage converter only when a single-voltage device must travel to a country on the other voltage family. Converters are heavy, expensive and rated by wattage — a 2000 W converter for a hair dryer is a different beast from a 50 W converter for a small appliance. Always match the converter's wattage rating to the device's, with comfortable headroom.
In practice, many seasoned travellers simply do not bring single-voltage high-wattage devices abroad. Hotels often provide hair dryers, and buying a cheap local version of an appliance is frequently less hassle than carrying a heavy converter.
A region-by-region quick reference
North America (US, Canada, Mexico) uses Type A/B at 120 V, 60 Hz. The UK and Ireland use Type G at 230 V, 50 Hz. Most of continental Europe uses Type C/E/F at 230 V, 50 Hz. Australia and New Zealand use Type I at 230 V, 50 Hz. China uses Type I at 220 V. Japan uses Type A/B at 100 V with a 50/60 Hz split.
Use the adapter-check tool above to confirm any specific pairing. The single most common mistake is assuming Europe is one uniform system — while the voltage is consistent, the plug grounding differs between France (Type E) and Germany (Type F), though most modern sockets accept both.
Frequently Asked Questions
Do I need a plug adapter or a voltage converter?
They are different things. A plug adapter only changes the shape of the pins so your plug fits the wall socket. A voltage converter changes the electrical voltage itself. Most modern electronics (phone and laptop chargers) are dual-voltage and need only a plug adapter; high-wattage devices like hair dryers may need a converter.
How do I know if my device is dual-voltage?
Check the small print on the device's power supply. If it reads '100–240 V, 50/60 Hz', it is dual-voltage and works worldwide with just a plug adapter. If it states a single voltage like '120 V', it needs a converter for countries with a different voltage.
What happens if I plug a 120 V device into a 230 V outlet?
The device will receive roughly double its rated voltage and can be permanently damaged or start a fire. Always verify voltage compatibility for non-dual-voltage devices before plugging them in abroad.
Why does frequency (50 Hz vs 60 Hz) matter?
Frequency mainly affects devices with motors or clocks — older electric clocks and some turntables run at the wrong speed on the wrong frequency. Most chargers and electronics ignore it, but appliances like fans or shavers may run slightly differently.
Are plug types stable within a country?
Mostly yes, but there are exceptions. Brazil uses more than one voltage and plug type depending on the region, and some countries have legacy sockets in older buildings. When in doubt, carry a universal adapter.
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