Internships are won by students who sound useful, not just interested. This letter shows the pattern: a specific skill, proof you used it, and one idea for what you would do at the company.
Full example · copy & customize
Dear Hiring Manager,
In my marketing course last semester, my team ran a social campaign for a local coffee shop and grew their Instagram reach by 140% in six weeks with a budget of $50. I handled the content calendar and the analytics, and I learned that small, consistent experiments beat big one-off ideas.
That is why I am applying for the marketing internship at your company. I know the work you do and I have already used the tools you rely on: I have run paid posts on Meta, pulled reports from Google Analytics, and written captions that turned numbers into a story the shop owner could act on. I want to spend the summer doing that work at a much bigger scale, with your team's feedback making me better at it.
In my first weeks, I would ask to sit in on campaign reviews, take ownership of one reporting task, and bring you two tested content ideas every Friday. If that sounds like a fit, I would welcome a chance to talk about what your team is planning for the fall.
[Your Name]
Replace every number with your own real results before sending — recruiters check. Never copy facts you can't back up.
Why this letter works
A classroom win with numbers. "140% reach in six weeks on a $50 budget" proves you can do real work, not just coursework. — Lead with a result you measured.
It names the tools. Google Analytics, Meta ads, content calendars — you sound ready to contribute from week one. — Match your tools to the internship's work.
It treats the internship as a job. "Ownership of one reporting task" and "two tested content ideas every Friday" show you came to work, not to watch. — Give the manager a reason to say yes.
It closes with a question, not a plea. "What your team is planning for the fall" invites a conversation. — End with an offer to talk, not a request for a chance.
Frequently asked questions
How long should an internship cover letter be?
150-200 words, three short paragraphs. Internship managers skim; lead with one strong result and one concrete idea.
What if I have never had any job before?
Coursework, clubs, and volunteer work all count when they produced a measurable outcome. Pick the strongest one and open with it.
Should I say I am eager to learn?
Show it instead. A specific skill plus one idea for the internship proves eagerness better than the word does.