Locale Cs Cz

Reference data for the Czech (Czech Republic) locale — endonym Čeština (Česko), written in the Latin script, left-to-right (LTR).

Identifiers

• BCP 47 tag: cs-CZ
• ISO 639-1: cs
• ISO 639-3: ces
• Script: Latn (Latin)
• Region: CZ (Czech Republic)
• Text direction: ltr — left-to-right (LTR)

Speakers (approximate)

• L1 (native): 9,800,000
• L2 (additional): 2,700,000
• L1+L2 (total): 12,000,000

Base locale

This is a regional variant of Locale Cs 001 (Czech), the base/macro locale for this language.

Pluralization

CLDR plural categories for this locale: one, few, many, other (4 forms).

• one — i = 1 and v = 0 (e.g. 1)
• few — i = 2..4 and v = 0 (e.g. 2~4)
• many — v != 0
• other — everything else (e.g. 0, 5~19, 100, 1000, …)

See Unicode Messageformat for writing plural messages using these categories.

Translating into this locale

Apply Locale Cs 001 with the conventions of the Czech Republic.

• Country name: the official short name is Česko (Czechia); use it in contexts where a short name is needed.
• Formats: koruna (Kč) after the amount; dates 17. 10. 2026 or 17. října 2026; 24-hour clock; decimal comma.
• Names and titles: give first name before surname in Czech; academic and professional titles (Ing., Mgr., Dr.) are used in formal correspondence and forms.
• Tone: reserved and practical; irony and understatement are common, and hard-sell marketing is viewed with suspicion.

Common pitfalls

• Using Slovak vocabulary or diacritics.
• Dropping academic titles in correspondence.
• The general pitfalls in Locale Cs 001 also apply.

Learn more

• Locale for BCP 47 identifiers, locale-sensitive formatting, pluralization, and text-direction concepts that apply across all locales.
• Unicode Messageformat for writing plural/selection messages correctly for this locale's grammar.
• Unicode CLDR locale data for number, date, and currency formats (https://cldr.unicode.org)