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Fifty in Irish (Caoga): Meaning, Pronunciation, Usage

The Irish for fifty is caoga, a masculine noun (plural caogaidí).
Updated October 2026Report a mistake

How to say “fifty” in Irish

Irish:
caoga
English:
fifty
Word type:
noun
Gender:
masculine
Pronunciation:
“KEE-guh”  /ˈkiːɡə/
Various forms
Plural:
caogaidí (fifties)
Genitive singular:
caogad, an chaogad (e.g. luach caogad, the value of fifty)
Genitive plural:
caogaidí, na gcaogaidí (e.g. ag deireadh na gcaogaidí, at the end of the fifties)

What does “caoga” mean?

fifty
The number 50, used for counting things or as a noun meaning a group of fifty.Also: 50, group of fifty, half a hundred.

Other Irish words for fifty: leathchéad (fifty)

“Caoga” with the article

The plural of fifty in Irish is caogaidí. Here is caoga after the article (an t-alt), in the singular and the plural.

an caoga
the fifty
No change after an
na caogaidí
the fifties
Plural: no change after na

“Caoga” in a sentence: Irish examples

Common Irish sentences using caoga, the Irish word for fifty.

Tá caoga duine ag obair sa mhonarcha.
Fifty people work in the factory.
Cúig bliana agus caoga atá sé anois.
He is fifty-five now.
Is é an cíos ceithre chéad caoga euro sa mhí.
The rent is four hundred and fifty euro a month.
Thug sí caoga euro dom don cheolchoirm.
She gave me fifty euro for the concert.
Rugadh m'athair sna caogaidí.
My father was born in the fifties.
Bhí an bus lán, caoga paisinéir ar a laghad.
The bus was full, fifty passengers at least.
Comhair go caoga agus ansin stad.
Count to fifty and then stop.

Other nouns in Irish

More everyday Irish nouns to learn next.

Fifty in Irish: frequently asked questions

What is the Irish for fifty?

The Irish for fifty is caoga (pronounced “KEE-guh”). It’s a masculine noun and the plural is caogaidí.

How do you pronounce caoga in Irish?

Caoga is said like “KEE-guh” (IPA /ˈkiːɡə/).

What is the plural of fifty in Irish?

The plural of caoga is caogaidí; with the article, na caogaidí means “the fifties”. The genitive plural is caogaidí, as in ag deireadh na gcaogaidí (at the end of the fifties).

Why does caoga change to chaoga or gcaoga?

Irish changes the start of some words after certain words. After mo (my) caoga becomes mo chaoga (lenition), and after ár (our) or i (in) it becomes ár gcaoga (eclipsis).

Does a noun after caoga go in the singular?

Yes, a noun after caoga stays in the singular with no mutation: caoga bliain, caoga duine.

Is there another way to say fifty?

The older vigesimal system uses dhá scór agus a deich, but caoga is standard in modern Irish.

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