Calculated on?

I need help..
Is the following correct, can one say:

  • That something new "wasn't calculated on"? -
    Or maybe "wasn't calculated for"?

Trying to say that something happened that we didn't anticipate.. "Something happened that wasn't calculated on/for."
(Note, it's important that the word "calculated" is being used, if it even is okay to use the word calculate as a synonym to anticipate?)
Maybe this is Swenglish? haha :)


  • The OED lists separate meanings for calculate for and calculate on.

    Calculate for is now used only in the PASSIVE be calculated for + NOUN PHRASE.
    On this construction and the similar be calculated to + INFINITIVE,
    calculated means 'arranged, designed, prepared, adjusted, adapted, or fitted for a purpose'.
    The two most recent OED example quotations are:

    1816 The coach was calculated to carry six regular passengers.
    1848 The college is calculated for the reception of sixty students.

    Calculate on is much closer to 'anticipate'. The four quotations are:

    1802 We calculate on your taking the lead in promoting subscriptions.
    1807 All those may almost be calculated upon.
    1829 Security in calculating upon the future.
    1873 We had calculated on a quiet Sunday.

    That said, the entry for calculate hasn't been updated since 1989, and all the examples cited are from the nineteenth century.
    So it's possible that usage has changed recently.

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