This information may change. Always check the official source.Last verified: August 2026 by

Sockets and voltage in United States

  • Type ANEMA 1-15No earth
  • Type BNEMA 5-15Earthed
Voltage
120 V
Frequency
60 Hz
Earthed sockets
Type B

What you need, by where you are coming from

  • Arriving from the UK or IrelandA plug adapter, and appliances marked 100-240 V. Anything single-voltage needs a converter.
  • Arriving from most of continental EuropeA plug adapter, and appliances marked 100-240 V. Anything single-voltage needs a converter.
  • Arriving from Australia or New ZealandA plug adapter, and appliances marked 100-240 V. Anything single-voltage needs a converter.

Socket types, voltage and frequency are the nominal domestic supply as published in IEC/TR 60083 and the national standards it lists.

American sockets are Type and at 120 V, 60 Hz, so European and British appliances need both an adapter and a 100-240 V label.

Sockets in the United States are Type and at 120 V, 60 Hz - half the voltage of Europe, Asia and Australia.

  • Type is Type with an earth hole. Two flat blades side by side, and a round earth below them. New buildings must have the earthed version; older apartments still have plenty of two-slot Type outlets.
  • The wider slot is neutral. That is why some plugs only go in one way round, and why an adapter that ignores polarity is worth avoiding.
  • Everything from Europe needs an adapter. No European, British or Australian plug fits a US socket.
  • 120 V is what actually breaks things. A 230 V-only appliance plugged in here will run slowly or not at all rather than burning out, but a travel adapter does nothing about voltage in either direction. Check the label for 100-240 V.
  • Hotels increasingly fit USB sockets beside the bed and on the desk lamp, which is often faster than hunting for a spare outlet behind the headboard.

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Sources (1)

What this guide was checked against. Rules and prices change — follow the official link before you rely on a detail.