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How to Count in Irish: 1 to 100 (ag comhaireamh)

Counting out loud is one list: a haon, a dó, a trí. Counting things adds one small change to the start of the thing: dhá chat, seacht gcat. Three rules cover it, and three everyday words break them.

Counting out loud: 1 to 10

This is the list for the time, phone numbers, bus numbers, page numbers and maths. Each number carries a short a in front of it, and that a puts an h before a vowel: a haon, a hocht.

1a haon
2a dó
3a trí
4a ceathair
5a cúig
6a sé
7a seacht
8a hocht
9a naoi
10a deich
11 to 20The tensBigger
11 a haon déag20 fiche100 céad
12 a dó dhéag30 tríocha200 dhá chéad
13 a trí déag40 daichead1,000 míle
14 a ceathair déag50 caoga2,000 dhá mhíle
15 a cúig déag60 seasca1,000,000 milliún
16 a sé déag70 seachtó
17 a seacht déag80 ochtó
18 a hocht déag90 nócha
19 a naoi déag100 céad
20 fiche

Tens first, then the unit: 21 is fiche a haon, 35 is tríocha a cúig, 99 is nócha a naoi. Twelve is a dó dhéag: dó is the one number that puts an h on déag.

Counting things: three rules

The number goes first, the thing stays singular, and the number decides what happens to the first letter of the thing.

1
catcat
+
amháinone
=
cat amháinone cat

Nothing changes. amháin comes after the thing.

2 to 6
dhátwo
+
catcat
=
dhá chattwo cats

An h goes in after the first letter. That is the séimhiú.

7 to 10
seachtseven
+
catcat
=
seacht gcatseven cats

A letter goes in front. That is the urú.

séimhiú urú
cat starts with cbord starts with búll starts with a vowelWhat happens
1cat amháinbord amháinúll amháinnothing; amháin after the thing
2dhá chatdhá bhorddhá úllséimhiú: an h after the first letter. A vowel has nothing to take an h, so it stays as it is.
3trí chattrí bhordtrí úll
4ceithre chatceithre bhordceithre úll
5cúig chatcúig bhordcúig úll
6sé chatsé bhordsé úll
7seacht gcatseacht mbordseacht n-úllurú: a letter in front. g before c, m before b, n- before a vowel.
8ocht gcatocht mbordocht n-úll
9naoi gcatnaoi mbordnaoi n-úll
10deich gcatdeich mborddeich n-úll
Two numbers change shape
Out loud it is a dó and a ceathair; before a thing it is dhá and ceithre.
11 to 19
Add déag after the thing: aon chat déag (11), dhá chat déag (12), seacht gcat déag (17). When the thing ends in a vowel, déag takes an h: dhá bhó dhéag (12 cows), cúig lá dhéag (15 days). The special plurals below keep déag: trí bliana déag (13 years).
The tens, a hundred, a thousand
Nothing changes: fiche cat (20), tríocha cat (30), céad cat (100), míle cat (1,000).
21 and up: two ways
Both are correct. Count the thing as above and add the ten after it: cat is fiche (21), dhá chat is fiche (22), seacht gcat is fiche (27). Or say the number first, as when counting out loud, and change nothing: fiche a haon cat, fiche a dó cat, fiche a seacht cat.

Three words that break the rules

uair (time), bliain (year) and ceann (one of them) keep an old plural after three to ten. They are the words you count most, so they are worth knowing on their own.

séimhiú or h urú the old plural
1uair amháinonce
2dhá uairtwice
3trí huairethree times
4ceithre huairefour times
5cúig huairefive times
6sé huairesix times
7seacht n-uaireseven times
8ocht n-uaireeight times
9naoi n-uairenine times
10deich n-uaireten times

From three up, uair becomes uaire. Three to six put an h before it, seven to ten put n- before it. Bhí mé ann trí huaire, I was there three times.

A few more follow the same idea: seachtain (week): trí seachtaine; troigh (foot): trí troithe; pingin (penny): trí pingine.

In a sentence

Tá cat amháin agam.
I have one cat.
Tá dhá mhadra sa ghairdín.
There are two dogs in the garden.
Cheannaigh mé trí úll agus sé oráiste.
I bought three apples and six oranges.
Tá seacht lá sa tseachtain.
There are seven days in the week.
Tá sí trí bliana d’aois.
She is three years old.
Bhí mé ann trí huaire.
I was there three times.
Fan dhá sheachtain.
Wait two weeks.
Tá deich mbliana ann ó shin.
It is ten years since then.

More numbers

Counting in Irish: the questions people ask

How do you count from 1 to 10 in Irish?

a haon, a dó, a trí, a ceathair, a cúig, a sé, a seacht, a hocht, a naoi, a deich. The a in front puts an h before a vowel: a haon, a hocht.

How do you count to 20 in Irish?

11 to 19 add déag: a haon déag, a dó dhéag, a trí déag, a ceathair déag, a cúig déag, a sé déag, a seacht déag, a hocht déag, a naoi déag. Twenty is fiche.

How do you count to 100 in Irish?

The tens are fiche (20), tríocha (30), daichead (40), caoga (50), seasca (60), seachtó (70), ochtó (80), nócha (90), céad (100). Tens first, then the unit: fiche a haon (21), caoga a cúig (55), nócha a naoi (99).

How do you say “two cats” in Irish?

dhá chat. Before a thing, two is dhá, and it adds a séimhiú. The thing stays singular: dhá chat, not dhá chait. One cat is simply cat amháin.

Why is it seacht gcat and not seacht cat?

Seven, eight, nine and ten add an urú (eclipsis) to the thing: seacht gcat, ocht mbord, naoi bpunt, deich n-úll. Two to six add a séimhiú instead: trí chat, sé bhord.

How do you say 21 in Irish?

Counting: fiche a haon. With a thing there are two correct ways: cat is fiche or fiche a haon cat, twenty-one cats; dhá chat is fiche or fiche a dó cat, twenty-two cats.

Does the noun go plural after a number in Irish?

No, it stays singular: trí chat, deich gcat, fiche cat. A few everyday words keep a special plural after 3 to 10: trí huaire (three times), trí bliana (three years), trí cinn (three of them), trí seachtaine (three weeks).

How do you say “three times” and “three years” in Irish?

trí huaire and trí bliana. uair and bliain are two of the words with a special form after 3 to 10; seven times is seacht n-uaire, seven years seacht mbliana. After two they are ordinary: dhá uair, dhá bhliain.