factor in

(also factor sth into sth)
to include something when you are doing a calculation, or when you are trying to understand something:
People are earning more, but when inflation is factored in, they are no better off.
The age of the patients and their overall health must be factored into the results.
(Cambridge Advanced Learner's Dictionary & Thesaurus からの factor sth in の定義 © Cambridge University Press)

ビジネス英語
(also factor sth into sth)
to include or consider a particular fact when you are planning or calculating something:
Her salary is not that high when childcare costs and medical insurance are factored in.
Are increases in mortgage repayments factored into the calculation of the cost of living index?
(Cambridge ビジネス英語辞典 からの factor sth in の定義 © Cambridge University Press)

- Cambridge Dictionary