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To cost in Irish (costáil): Meaning, Conjugation, Examples

The Irish for to cost is costáil; ag costáil is costing.
Updated October 2026Report a mistake

How to say “to cost” in Irish

Irish:
costáil
English:
to cost
Word type:
verb, first-conjugation
Verbal noun:
costáil (ag costáil, costing)
Verbal adjective:
costáilte
Pronunciation:
“KOS-taw-il”  /ˈkɔst̪ˠaːlʲ/

What does “costáil” mean?

to cost
To calculate or estimate how much something will cost.Also: estimate the cost of, price, work out the cost.

“Costáil” in the different tenses

Every form follows An Caighdeán Oifigiúil.

Aimsir Chaite (Past)

PersonPositiveNegativeQuestion
mé (I)Chostáil méI costNíor chostáil méI did not costAr chostáil mé?Did I cost?
tú (you)Chostáil túYou costNíor chostáil túYou did not costAr chostáil tú?Did you cost?
sé / sí (he / she)Chostáil sé / síHe costNíor chostáil sé / síHe did not costAr chostáil sé / sí?Did he cost?
sinn (we)ChostálamarWe costNíor chostálamarWe did not costAr chostálamar?Did we cost?
sibh (you, plural)Chostáil sibhYou costNíor chostáil sibhYou did not costAr chostáil sibh?Did you cost?
siad (they)Chostáil siadThey costNíor chostáil siadThey did not costAr chostáil siad?Did they cost?
saorbhriathar (autonomous)CostáladhNíor costáladhAr costáladh?

Aimsir Láithreach (Present)

PersonPositiveNegativeQuestion
mé (I)CostálaimI costNí chostálaimI do not costAn gcostálaim?Do I cost?
tú (you)Costálann túYou costNí chostálann túYou do not costAn gcostálann tú?Do you cost?
sé / sí (he / she)Costálann sé / síHe costsNí chostálann sé / síHe does not costAn gcostálann sé / sí?Does he cost?
sinn (we)CostálaimidWe costNí chostálaimidWe do not costAn gcostálaimid?Do we cost?
sibh (you, plural)Costálann sibhYou costNí chostálann sibhYou do not costAn gcostálann sibh?Do you cost?
siad (they)Costálann siadThey costNí chostálann siadThey do not costAn gcostálann siad?Do they cost?
saorbhriathar (autonomous)CostáiltearNí chostáiltearAn gcostáiltear?

Aimsir Fháistineach (Future)

PersonPositiveNegativeQuestion
mé (I)Costálfaidh méI will costNí chostálfaidh méI will not costAn gcostálfaidh mé?Will I cost?
tú (you)Costálfaidh túYou will costNí chostálfaidh túYou will not costAn gcostálfaidh tú?Will you cost?
sé / sí (he / she)Costálfaidh sé / síHe will costNí chostálfaidh sé / síHe will not costAn gcostálfaidh sé / sí?Will he cost?
sinn (we)CostálfaimidWe will costNí chostálfaimidWe will not costAn gcostálfaimid?Will we cost?
sibh (you, plural)Costálfaidh sibhYou will costNí chostálfaidh sibhYou will not costAn gcostálfaidh sibh?Will you cost?
siad (they)Costálfaidh siadThey will costNí chostálfaidh siadThey will not costAn gcostálfaidh siad?Will they cost?
saorbhriathar (autonomous)CostálfarNí chostálfarAn gcostálfar?

Modh Coinníollach (Conditional)

PersonPositiveNegativeQuestion
mé (I)ChostálfainnI would costNí chostálfainnI would not costAn gcostálfainn?Would I cost?
tú (you)ChostálfáYou would costNí chostálfáYou would not costAn gcostálfá?Would you cost?
sé / sí (he / she)Chostálfadh sé / síHe would costNí chostálfadh sé / síHe would not costAn gcostálfadh sé / sí?Would he cost?
sinn (we)ChostálfaimisWe would costNí chostálfaimisWe would not costAn gcostálfaimis?Would we cost?
sibh (you, plural)Chostálfadh sibhYou would costNí chostálfadh sibhYou would not costAn gcostálfadh sibh?Would you cost?
siad (they)ChostálfaidísThey would costNí chostálfaidísThey would not costAn gcostálfaidís?Would they cost?
saorbhriathar (autonomous)ChostálfaíNí chostálfaíAn gcostálfaí?

“Costáil” in a sentence: Irish examples

Past, present, future and conditional, with a negative and a question.

Chostáil an t-innealtóir an tionscadal inné.
The engineer costed the project yesterday.
Costálann siad gach jab sula dtosaíonn siad.
They cost every job before they start.
Costálfaidh an chomhairle an plean nua.
The council will cost the new plan.
Chostálfainn an obair dá mbeadh na sonraí agam.
I would cost the work if I had the details.
Níor chostáil siad an togra i gceart.
They did not cost the proposal properly.
Ar chostáil tú an turas fós?
Have you costed the trip yet?

Other verbs in Irish

More everyday Irish verbs to learn next.

To cost in Irish: frequently asked questions

What is the Irish for to cost?

The Irish for to cost is costáil (pronounced “KOS-taw-il”). It is a first-conjugation verb; the verbal noun is costáil.

What is the verbal noun of costáil?

The verbal noun of costáil is costáil, used after ag for the continuous: ag costáil (costing). The verbal adjective is costáilte.

How do you say costáil in the past and the future?

Past: Chostáil mé; negative Níor chostáil mé; question Ar chostáil mé?. Future: Costálfaidh mé; negative Ní chostálfaidh mé; question An gcostálfaidh mé?.

What is the modh coinníollach of costáil?

The conditional (modh coinníollach) first person is Chostálfainn (I would cost); negative Ní chostálfainn; question An gcostálfainn?.

Is 'costáil' the same as 'cosain' (to cost)?

No. 'Cosain' means something costs a price, as in 'Chosain sé deich euro', while 'costáil' means to work out the cost of something, as in 'Chostáil sí an plean'.

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