Electrical Plug Reference Calculator
Country plug compatibility reference
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Quick Answer
The world uses 15 standard plug types (A-O). North America and Japan use 120V/60Hz with Type A/B plugs. Europe, Asia, and Africa use 220-240V/50Hz with Types C/E/F/G. Always check whether your device supports dual voltage (100-240V) before international travel.
Electrical Plug Reference
Identify plug and socket types used around the world. Covers all 15 international plug types with voltage, frequency and regional usage information.
Common Plug Types
- Type A -- North America, Japan
- Type B -- North America, grounded
- Type C -- Europe, South America
- Type G -- UK, Ireland
- Type I -- Australia, China
Design Notes
Electrical plug standards are the result of over a century of independent national electrification programs. Harmonization efforts (e.g., IEC 60906-1 proposing a universal Type N plug) have had limited success. For product design targeting global markets, use IEC C14 inlets with detachable country-specific power cords.
Common Mistakes
- 1
Assuming a plug adapter also converts voltage — most adapters only change the physical shape, NOT the voltage.
- 2
Using devices rated for 120V only on a 240V supply without a transformer — this will destroy the device.
- 3
Forgetting that Japan uses 100V (not 110-120V like the US) which can cause some US devices to underperform.
Knowledge Base
Which countries use Type G plugs?
Type G (3 rectangular pins) is used primarily in the United Kingdom, Ireland, Malaysia, Singapore, Hong Kong, UAE, and many former British colonies. It is one of the safest plug designs with built-in fuse (3A or 13A), shuttered sockets, and insulated pin sleeves.
What is the difference between Type A and Type B plugs?
Both are used in North America, Japan, and parts of Central America. Type A has 2 flat parallel pins (ungrounded). Type B adds a round grounding pin below the two flat pins. Type B is required for appliances above 150W in the US. Japanese Type A pins are identical in size; US Type A has one pin wider (polarized).
What voltage and frequency does each country use?
The world splits into two main groups: 110-120V/60Hz (North America, Japan, parts of South America) and 220-240V/50Hz (Europe, Asia, Africa, Australia). Some countries have mixed systems or regional variations. Japan uses 100V with 50Hz in eastern regions and 60Hz in western regions.
Do I need a voltage converter or just a plug adapter?
If your device says '100-240V 50/60Hz' on its label (most modern chargers, laptops, and phone chargers do), you only need a plug adapter. If it says a single voltage like '120V 60Hz', you need both a plug adapter AND a voltage converter/transformer. Using 120V devices on 240V without a converter will damage or destroy them.
What is a universal travel adapter?
A universal travel adapter accepts plugs from any country and converts them to fit the local outlet. Most do NOT convert voltage — they only adapt the physical plug shape. Premium models include USB-A/USB-C ports with built-in voltage conversion (5V output).
What are the most dangerous plug types?
Type C (Europlug, 2 round pins, ungrounded) has no earth connection and can be inserted into some incompatible sockets. Old British round-pin plugs (Type D) and Italian Type L can also be problematic. The safest designs are Type G (UK, fused) and Type I (Australia, insulated pins) with shuttered sockets.
Why do some countries use 220V while others use 110V?
Historical: early US electrification standardized on 110V (considered safer for direct contact). Europe later adopted 220V because it transmits the same power with half the current, allowing thinner wires and less copper — an economic advantage for countries electrifying later. Higher voltage is actually more efficient for distribution.
Can I use a 60Hz appliance on 50Hz power?
For resistive loads (heaters, incandescent lights): no problem. For motor-driven devices (clocks, turntables, some fans): 50Hz will run 17% slower. For transformers: 50Hz causes higher magnetizing current and potential overheating. Modern electronics with switching power supplies (SMPS) handle both frequencies.
What plug type does China use?
China primarily uses Type A (2-pin, compatible with US plugs) and Type I (3-pin, Australian-style with angled pins). Chinese outlets often accept multiple plug types in a universal socket design. The standard is 220V/50Hz. Hong Kong uses Type G (British), and Macau uses a mix.
What is the IEC 60083 standard?
IEC 60083 is the international standard that defines the 15 plug/socket types (A through O) used worldwide. Each type specifies pin shape, spacing, grounding method, and current rating. It does not mandate which type a country must use — that is determined by national electrical codes.