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calculate on (something)
To consider or think about something. He'll have an answer for you soon—he's been calculating on your offer for days.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
calculate on something
Rur. to think about or plan on something. Let me calculate on this a little bit. He's busy calculating on a serious problem.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.