계산이 · 계산을
calculation; paying the bill, checkout
Example
오늘 저녁 계산은 제가 할게요.
I'll pay for dinner tonight.
Word parts
계 count+산 calculate
Literally 'count and calculate'; at a store or restaurant it means paying.
Good to know
At a restaurant, say "계산해 주세요" for "Check, please."