Plugs & voltage in Sri Lanka
Types D, G and M · 230 V · 50 Hz
The same answers apply to Botswana and Macau.
Sri Lanka is the only country in Southern Asia with this plug set; the most common set there is C/D/M (2 of 7 others). It is the most populous country that uses exactly Types D, G and M.
Do I need an adapter for Sri Lanka?
Where are you travelling from?
Adapter, and mind the voltage.
230 V here, 120 V at home.
Plug straight in.
Bring an adapter to Types D, G or M.
Bring an adapter to Types D, G or M.
Bring an adapter to Types D, G or M.
Bring an adapter to Types D, G or M.
Types D and M plugs fit; Type C plugs need an adapter to Types D, G or M.
Adapter, and mind the voltage.
230 V here, 100 V at home.
The power supply
Same plugs as Sri Lanka
2 other countries use exactly D/G/M: 1 in Africa and 1 in Asia.
The plug types used here
Guides: Countries with several plug types, ranked · The 15 plug types explained
Source: Wikidata Q854; regions: UN M49 (Southern Asia). Sources & method