One plug for every country? The coverage numbers

How far each plug type reaches

For each plug, the table counts the countries where it fits at least one socket type in use, using the fit rules from our method page. A plug can reach more countries than its own type is used in: Type C is listed in 88 countries but fits in 90, because other sockets accept it.

The E/F hybrid plug comes second with 68 countries. It does not fit a plain Type C socket, which is narrower, so it reaches fewer countries than the flat two-pin plug.

Where Type C does not go

Type C fails in 49 countries. Of those, 24 use Type G, 21 use Types A or B (Japan, Taiwan and countries in the Americas), and three use Type I; Namibia is outside those groups. That is why the next plugs to add are G and A.

The smallest set that covers every country

Adding plug types one at a time, always picking the one that reaches the most new countries, gives this sequence:

After C, G and A, the countries still missing are Australia, Fiji, New Zealand and Namibia. The first three use only Type I. Namibia uses Types D and M, so the fifth plug can be either D or M. A search over every combination confirms that no set of four plug types covers all 139 countries.

What the plugs from seven home regions reach

Real travellers carry the plugs of their home, not a chosen set. Our country pages use seven home profiles, each with the plugs normally found there. The table counts the countries where every one of those plugs fits a local socket, the home country included.

Continental Europe comes out far ahead, at 68 countries, because its two plugs, the flat Type C and the E/F hybrid, go into the C, E and F sockets that dominate the map. The Chinese profile reaches only 1: it pairs a Type A and a Type I plug, and only China uses both of those socket types together.

Fitting is only half the answer

A plug that fits says nothing about voltage. Of the 19,182 ordered pairs of countries, 186 combine a plug that fits with a supply in the other voltage range; this guide lists them. Fitting also says little about earthing. A Type C plug has no earth contact wherever it goes, and the E/F hybrid fits the Type K sockets used in Denmark, the Maldives and Senegal without being earthed in them.

So the answer to “is there a universal plug” depends on what you need it to do. To go into a socket, five plug faces are enough for every country in our data. To work, the device behind the plug also has to accept the local supply; check your device’s input rating label.

Checking a specific trip

The coverage numbers describe the whole map. For one trip, the adapter checker lists each of your plug types and the sockets it fits at the destination, for example United Kingdom → Singapore, where a British plug fits, or Australia → Japan, where it does not.

Sources

• Wikidata (CC0): electrical plug type (P2853), mains voltage (P2884) and frequency, retrieved 28 October 2026, checked against national and technical sources
• Wikipedia, Mains electricity by country (CC BY-SA 4.0): cross-check of plug types, voltage and frequency, facts only
• PlugAtlas sources and method, including the socket fit rules

More guides

• The 15 plug types explained
• 230 V vs 120 V countries: the count by region
• Countries with several plug types, ranked
• When the plug fits but the voltage doesn’t
• How the adapter checker works