Verbseoul.
하다 verb
계산하다gyesanhadato calculate

To say to calculate politely in the present tense, use 계산해요 (gyae-sahn-hae-yoh). Below is the full conjugation of 계산하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
계산해
gyae-sahn-hae
계산해요
gyae-sahn-hae-yoh
계산합니다
gyae-sahn-hahm-nee-dah
Past
계산했어
gyae-sahn-hae-ssuh
계산했어요
gyae-sahn-hae-ssuh-yoh
계산했습니다
gyae-sahn-hae-sseum-nee-dah
Future
계산할 거야
gyae-sahn-hahl- -guh-yah
계산할 거예요
gyae-sahn-hahl- -guh-yae-yoh
계산할 겁니다
gyae-sahn-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
계산하세요
gyae-sahn-hah-sae-yoh
Suggestion / Let's Polite (요)
계산해요
gyae-sahn-hae-yoh
Question Polite (요)
계산해요?
gyae-sahn-hae-yoh-?
Connective “and” — (고)
계산하고
gyae-sahn-hah-goh
Conditional “if” — (면)
계산하면
gyae-sahn-hah-myuhn
Noun form — (기)
계산함
gyae-sahn-hahm