LATIN DICTIONARYLexicon Latīnum
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“calculate” in Latin

The English word calculate itself goes back to Latin calx, through calculātus.

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

calculate v.
to reckon, computare, supputare (to sum up): alicujus rei rationem inire; ad calculos vocare aliquid: calculum ponere in re (to reckon over, take an account): computando efficere (to make out by calculating): to calculate expenses, or the cost, ad calculos vocare sumtus: to calculate an amount in the current coin of our own country, ad nostrae pecuniae rationem revocare aliquid: to calculate the course of the heavenly bodies, stellarum or siderum cursus et motus numeris persequi; cursus siderum dimetiri (measure and calculate): the loss can not be calculated, damnum majus est quam quod aestimari possit: to calculate every thing according to one’s own interest, omnia metiri emolumentis et commodis: to calculate with any one, rationem cum aliquo putare, instituere, conferre; rationem or calculum ponere cum aliquo (Plin., Panegyricus, 20, 5): to calculate every thing by pounds, shillings, and pence, omnia ad lucrum revocare: to learn to calculate, arithmetica discere: to calculate well, in arithmeticis satis exercitatum esse: to calculate by Olympiads, Olympiadum numero finire: the Gauls calculate time by days, and not by nights, Galli spatia omnis temporis non numero dierum, sed noctium finiunt (Caes., B.G., 6, 18): the Germans do not calculate time by days, as we do, hut by nights, Germani non dierum numerum, ut nos, sed noctium computant (Tac., Germania, 11, 2).
To calculate upon a thing, sperare fore ut, etc. I calculate upon your coming, spero fore ut venias. IMPROPR., (a) to weigh anything, calculum ponere in re (Plin., Epistulae, 1, 14, 9): to calculate or weigh all the difficulties or circumstances attending any matter, ponere calculos in utraque parte (Plin., Epistulae, 2, 19, 9): (b) to intend a certain effect, accommodare aliquid ad rem.

Quick answer

What is the Latin word for calculate?
The usual Latin words for “calculate” are computō, supputō, stēlla. 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.