GB · GBR
United Kingdom languages and locale codes
Official or primary languages with practical BCP 47 locale recommendations.
BCP 47
Languages and locale codes
| Language | Code | Recommended locale | Status |
|---|---|---|---|
| English | Official | ||
| Welsh | Regional official | ||
| Irish | Regional official | ||
| Scottish Gaelic | Regional official |
Use a United Kingdom locale in a product
When content is written in English, use the lang tag below to describe the text. The Intl locale selects regional formatting. This is one example from the table, not a claim about every visitor's language preference.
<html lang="en">
new Intl.NumberFormat("en-GB").format(1234567.89);Compare number and date formatting
These examples use 1234567.89 and the fixed instant 2026-01-15T13:45:00Z, with dates displayed in UTC. Intl computes the results when this site is built; your browser and locale-data version may differ. Unsupported tags are identified instead of showing default-language output.
| Locale | Number | Date | Currency |
|---|---|---|---|
en-GB | 1,234,567.89 | 15 January 2026 | GBP: £1,234.50 |
cy-GB | 1,234,567.89 | 15 Ionawr 2026 | GBP: £1,234.50 |
ga-GB | 1,234,567.89 | 15 Eanáir 2026 | GBP: £1,234.50 |
gd-GB | 1,234,567.89 | 15mh dhen Fhaoilleach 2026 | GBP: £1,234.50 |
Currency examples use the fixed value 1234.5. SIX and CLDR snapshot: 2026-09-26. Specify each currency explicitly; formatting is not an exchange rate.
new Intl.NumberFormat("en-GB", { style: "currency", currency: "GBP" }).format(1234.5);Before adopting a tag, run Intl.NumberFormat.supportedLocalesOf() and Intl.DateTimeFormat.supportedLocalesOf() in your target runtime. A locale does not select a time zone or translate interface text; specify currency explicitly when formatting money.
Data provenance
Sources
- ISO 3166-1 country codes
- Unicode CLDR territory information
- SIX: ISO 4217 List One
- Unicode CLDR 48 currency territory data
Data snapshot: 2026-09-26