calculate in(redirected from calculate it in)
To include a particular amount as one does calculations. A noun or pronoun can be used between "calculate" and "in." When you submit your travel expenses for reimbursement, be sure to calculate gas in. Wait, I didn't calculate in the tip, so we each need to chip in a bit more money.
See also: calculate
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.