Sources & method
Where the plug and voltage data comes from, how we checked it, and how the adapter advice is worked out.
Sources
Plug types, nominal voltage and frequency, population and neighbouring countries come from the public Wikidata page of each country (CC0), read on 28 October 2026. Regions follow the United Nations M49 standard. Every country was compared with the table in the English Wikipedia article Mains electricity by country (CC BY-SA 4.0); only facts such as plug letters, voltages and frequencies are compared, and no text from the article is reused. Many countries were also checked against national regulators, utilities and technical references.
Checks and corrections
A plug type is listed only when two independent sources agree. In 17 countries a value was corrected against a cited source (for example three-phase figures recorded as mains voltage). Where sources differ only within the same voltage family (220 vs 230 V), the country page says so.
Plug and voltage answers
For each home region we take the plugs normally used there and check whether they physically fit the destination’s sockets. “Adapter needed” means none of them fit (or only some do). “Different voltage” means the destination is in the other voltage family (100–127 V vs 220–240 V); check your device’s input rating label for the range it accepts. Voltages are nominal; actual supply varies.
The adapter checker applies the same fit rules between any two countries. Its starting plugs are the plug types used in the country you travel from, with Type E and F counted as the E/F hybrid plug. Voltages within 10 V count as the same, values in the same range as “same range”; frequency is compared directly.
Plug drawings
The pin drawings are simplified diagrams made for this site to show pin count and layout; they are not to scale.