calculation · noun C or U /ˌkæl.kjʊˈleɪ.ʃən/
Nouns: calculation, calculator
Adjectives: calculated, calculating, incalculable
B2 when you use mathematics to discover an amount or number
I did some quick calculations to see if we could afford it.
Just a simple calculation: the living space an elephant has got in a zoo is about 500m2. (First Certificate in English; B2; Dutch)