LATIN DICTIONARYLexicon Latīnum
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“calculation” in Latin

The English word calculation itself goes back to Latin calculus, through calculatio.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

calculation s.
ratio: computatio supputatio. To make friendship a mere calculation of interest, nimis exigue et exiliter ad calculos vocare amicitiam. A calculation made or to be made, ratio subducta or subducenda.

Quick answer

What is the Latin word for calculation?
The usual Latin words for “calculation” are ratiō, subdūcō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.