🔌 Plugs
Yes. You'll need a US-style (type A/B) adapter. The voltage is 120V, much lower than the UK's 230V. Phone, laptop and camera chargers marked "100–240V" are fine with an adapter. UK hairdryers, straighteners and kettles usually won't work properly unless they're dual-voltage. You'd need a voltage converter, or buy one locally.
🕒 Time
San Francisco is 8 hours behind the UK all year.
💶 Money
San Francisco uses the US dollar (USD). Tipping is expected: 18–20% in restaurants, $1–2 a drink in bars, 15–20% for taxis and hairdressers. Prices usually exclude sales tax too.
More about the USA
Related questions
Common questions
Do I need a plug adapter for San Francisco?
Yes. You'll need a US-style (type A/B) adapter.
What is the time difference between the UK and San Francisco?
San Francisco is 8 hours behind the UK all year.
What currency is used in San Francisco?
The US dollar (USD).
For passports, visas, entry requirements, health and safety advice, always check GOV.UK foreign travel advice before you travel.