Finland.

230 V · 50 Hz on Type F, Type C.

Finland fits recessed Schuko Type F sockets throughout, at 230 V and 50 Hz, so europlugs and earthed Schuko plugs from the rest of the continent work unchanged. Anyone arriving from the UK, Ireland or the Americas needs an adapter, and North American single-voltage appliances need to be dual-voltage to cope with 230 V.

The voltage window

A nominal 230 V supply may legitimately sit anywhere between 207 and 253 V (±10%). Dual-voltage gear (marked 100–240 V) shrugs at all of it.

Grid facts verified against IEC World Plugs — Finland. Prose is our own.

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Pack an adapter — Finland runs 230 V 50 Hz on Type F, Type C — and your 120 V appliances need to be dual-voltage or transformed, adapter or not.

Type A needs an adapter
Finland's Type F / Type C sockets don't take a Type A plug.
the full story
Type B needs an adapter
Finland's Type F / Type C sockets don't take a Type B plug.
the full story

Faces drawn to scale from pin dimensions · verdicts are physical fit + voltage math, not safety advice — when in doubt, ask the hardware store, not the internet.