'calculative' originates from Latin, specifically the word 'calculativus,' where 'calculare' meant 'to reckon or compute.'

'calculativus' transformed into the French word 'calculatif,' and eventually became the modern English word 'calculative' through Middle English.

Initially, it meant 'to compute or reckon,' but over time it evolved into its current meaning of 'tending to plan or think carefully about actions.'