competent in + field
Talking about knowledge in an area
Use competent in with subjects, professions, or areas of expertise.
They are competent in contract law.
competent: which preposition to use
Competent is most commonly followed by in or at to describe skill or ability. Other prepositions are usually limited to special contexts or are not idiomatic.
Quick answer
Competent in vs. competent at
Use competent in for fields, subjects, or areas of work, and competent at for activities or tasks. Competent with is used for tools or technology. Competent for and competent to are uncommon and usually replaced by suitable or qualified to.
She is competent in financial analysis.
He is competent at managing large teams.
The designer is competent with editing software.
He is competent at managing large teams.
The designer is competent with editing software.
Choose the pattern by meaning
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
competent at + activity
Talking about skill in an activity
Use competent at with tasks, actions, or performance.
She is competent at solving technical problems.
competent with + tool
Talking about handling equipment or technology
Use competent with for software, machines, instruments, or practical tools.
He is competent with digital cameras.
competent to + verb
Talking about legal or formal authority
Competent to is mainly formal and often refers to authority or legal ability rather than skill.
The court is competent to hear the case.
See the difference in context
The same subject can take different constructions because each sentence answers a different question.
Construction
Example
Meaning
competent in
She is competent in marketing.
Skilled within a field or subject area.
competent at
He is competent at negotiating.
Skilled at performing an activity.
competent with
Are you competent with spreadsheets?
Able to use a tool or system effectively.
competent for
She is competent for the role.
Possible but uncommon; suitable for is more natural.
competent to
The agency is competent to decide the matter.
Formal expression of authority or legal power.
Common mistakes
Some combinations appear in real text but do not mean what learners often assume.
Using competent for instead of qualified for
Competent for exists but sounds unnatural in many contexts.
✕ He is competent for this job. ✓ He is qualified for this job.Using competent to for general skills
Competent to usually refers to authority, not everyday ability.
✕ She is competent to coding. ✓ She is competent at coding.Confusing in and at
Use in for fields and at for activities.
✕ He is competent in fixing engines. ✓ He is competent at fixing engines.Missing a preposition
Competent normally needs a preposition before the skill area.
✕ She is competent finance. ✓ She is competent in finance.Quick practice
Choose the expression that matches the intended meaning.
1. She is competent ___ data analysis.
2. He is competent ___ repairing bicycles.
3. The technician is competent ___ the new software.
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Frequently asked questions
Is competent in or competent at more common?
Both are common. Use in for fields and at for activities.
Can I say competent with computers?
Yes. Competent with is natural for tools, software, and equipment.
Is competent for correct English?
It is possible but uncommon. Suitable for or qualified for is usually more natural.
Related preposition guides
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