Grammar fix
factor in
take into account (when making a decision or calculation)
to include something as an important part of your decision, plan, or calculation, especially when it might affect the result
Hear it in context
Notice where the phrase sounds natural.
- When planning your budget, you need to factor in unexpected expenses like car repairs.work
- In my opinion, when choosing a university, students should factor in not just the academic reputation but also the cost of living in that city.IELTS speaking
Fix the pattern
Pattern: factor in + noun / factor something in
WrongWe need to factor the weather in our plans.
RightWe need to factor the weather into our plans. / factor in the weather.
'Factor X into Y' or 'factor in X' — note the 'into'.
Patternfactor in + noun / factor something in
Use it right
Choose the version that sounds natural in speech.
'Factor in' is the natural verb for including something in a calculation; 'take into consideration' is heavier.
Build natural chunks
Words that usually travel with it.
factor in + variablethe costtravel timetaxinflation
Don't confuse it
'Factor in' is more specific than 'consider'—it suggests actively including something as part of a calculation or decision, not just thinking about it. It is also more concise and natural in contexts involving numbers, planning, or weighing pros and cons.