'exactly-calculated' originates from the combination of 'exactly' and 'calculated', where 'exactly' comes from Latin 'exactus', meaning 'precisely', and 'calculated' from Latin 'calculatus', meaning 'reckoned'.

'exactly-calculated' evolved from the combination of the words 'exactly' and 'calculated', which were used separately in Middle English and later combined in modern English to describe precision in calculation.

Initially, 'exactly' meant 'precisely' and 'calculated' meant 'reckoned', and together they have maintained the meaning of 'determined with precision'.