factor in
B2Formal, Neutral
Definition
Meaning
To include something as a relevant element when making a calculation, decision, or plan.
To consciously consider or incorporate a variable, cost, risk, or influence into an analysis, forecast, or course of action.
Linguistics
Semantic Notes
This phrasal verb is transitive and separable. It often implies a more analytical or deliberate inclusion of information that might otherwise be overlooked.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning or usage. Spelling follows standard regional conventions (e.g., 'factor' vs 'factor').
Connotations
Slightly more common in formal business and academic contexts in both varieties.
Frequency
Equally frequent and standard in both British and American English.
Vocabulary
Collocations
Grammar
Valency Patterns
[Subject] factor [Object] in[Subject] factor in [Object]Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “to factor something into the equation”
Usage
Context Usage
Business
We must factor in the exchange rate fluctuations before finalising the contract.
Academic
The model factors in socio-economic variables to predict outcomes.
Everyday
Don't forget to factor in travel time when you plan your day.
Technical
The algorithm factors in user latency to optimise the feed.
Examples
By Part of Speech
verb
British English
- You must factor in the VAT when calculating the total.
- Have you factored the train delays in?
- The proposal fails to factor in seasonal demand.
American English
- We didn't factor in the sales tax.
- Be sure to factor shipping costs in.
- Their analysis factors in demographic shifts.
adverb
British English
- N/A
American English
- N/A
adjective
British English
- N/A
American English
- N/A
Examples
By CEFR Level
- Remember to factor in the cost of food for your trip.
- The price is good, but you need to factor in delivery.
- When planning the project timeline, we must factor in potential supply chain issues.
- The study failed to factor in the participants' prior experience.
- Any credible climate model must factor in feedback loops that could accelerate warming.
- The investor's strategy astutely factored in geopolitical instability, which saved the portfolio from significant losses.
Learning
Memory Aids
Mnemonic
Imagine a MATH FACTOR. To solve the problem correctly, you must 'factor in' (put inside the equation) all the important numbers.
Conceptual Metaphor
PLANNING/THINKING IS CALCULATION. Adding a factor to a mental or literal sum.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid translating as 'факторизовать' (to factorise in maths).
- Avoid using 'в факторе' as a direct translation. The meaning is 'учитывать', 'принимать во внимание'.
Common Mistakes
- Incorrect: 'We need to factor the budget.' (Missing 'in')
- Incorrect word order: 'We need to factor in it.' (Should be 'factor it in')
- Confusion with noun: 'He is a major factor in the team.' (Here 'factor' is a noun, not a phrasal verb).
Practice
Quiz
In which sentence is 'factor in' used CORRECTLY?
FAQ
Frequently Asked Questions
It is neutral to formal. It is perfectly acceptable in business, academic, and technical writing, as well as everyday speech when discussing plans or calculations.
Yes, it is a separable phrasal verb. You can say 'factor in the cost' or 'factor the cost in'. When the object is a pronoun (it, them), it must go in the middle: 'factor it in'.
They are very close synonyms. 'Factor in' often suggests a more quantitative or systematic inclusion, while 'take into account' can be slightly broader. In many contexts, they are interchangeable.
Yes, 'factor out' is the opposite, meaning to exclude or remove something as a contributing element from consideration or a calculation (e.g., 'Factor out the one-time charges to see the recurring revenue').