What country code do I use to fax to the UK?

The UK country code for faxing is +44. On a physical fax machine in the US, dial 011-44 followed by the UK number without its leading zero. With an online fax service like mFax.to, enter +44 followed by the area code (no leading zero) and local number.

Do I need to drop the leading zero when faxing to the UK?

Yes — this is the single most common mistake. UK numbers start with 0 domestically (e.g., 020 for London), but that leading 0 must be removed when dialing internationally. A London number written as 020 7946 0958 becomes +44 20 7946 0958 from the US.

What is the US exit code for faxing internationally?

When using a physical fax machine in the US, dial 011 to access the international network, then 44 for the UK. Online fax services like mFax.to accept the + prefix directly, so you simply enter +44 and skip the 011 exit code entirely.

What is the best time to send a fax to the UK from the US?

The UK runs 5 hours ahead of Eastern Time in winter (EST) and 6 hours ahead in summer when the UK observes BST. To reach a UK business during 9 AM–5 PM GMT, send your fax between 4 AM–12 PM ET, or 1 AM–9 AM PT.

Does paper size matter when faxing between the US and UK?

Not in practice. The UK standard is A4 (210×297mm) and the US uses Letter (8.5×11in). Modern fax machines and online services handle both sizes automatically, so your documents transmit and print correctly on the other end.

How to Fax to the UK from the US: Country Code & Steps

Faxing from the US to the UK requires country code +44 and one easy rule: drop the leading zero from the UK area code. This guide covers the complete dial format, common area codes, time zone tips, and a step-by-step walkthrough.

Frequently Asked Questions

What country code do I use to fax to the UK?: The UK country code for faxing is +44. On a physical fax machine in the US, dial 011-44 followed by the UK number without its leading zero. With an online fax service like mFax.to, enter +44 followed by the area code (no leading zero) and local number.
Do I need to drop the leading zero when faxing to the UK?: Yes — this is the single most common mistake. UK numbers start with 0 domestically (e.g., 020 for London), but that leading 0 must be removed when dialing internationally. A London number written as 020 7946 0958 becomes +44 20 7946 0958 from the US.
What is the US exit code for faxing internationally?: When using a physical fax machine in the US, dial 011 to access the international network, then 44 for the UK. Online fax services like mFax.to accept the + prefix directly, so you simply enter +44 and skip the 011 exit code entirely.
What is the best time to send a fax to the UK from the US?: The UK runs 5 hours ahead of Eastern Time in winter (EST) and 6 hours ahead in summer when the UK observes BST. To reach a UK business during 9 AM–5 PM GMT, send your fax between 4 AM–12 PM ET, or 1 AM–9 AM PT.
Does paper size matter when faxing between the US and UK?: Not in practice. The UK standard is A4 (210×297mm) and the US uses Letter (8.5×11in). Modern fax machines and online services handle both sizes automatically, so your documents transmit and print correctly on the other end.