How to Write a Letter of Recommendation — A Guide That Doesn't Waste Your Time

The structure that works every time

Whether you're recommending a student for grad school, an employee for a new job, or a colleague for an award, the format is the same. Four paragraphs, one page.

What separates good from great recommendations

I've reviewed hundreds of recommendation letters as both a hiring manager and an academic advisor. The mediocre ones all sound the same: "hardworking," "dedicated," "pleasure to work with." Those words are meaningless without evidence. They could describe literally anyone who didn't get fired.

Strong recommendations anchor every claim to a specific moment. Instead of "excellent problem-solver," you write: "When our Q3 product launch hit a critical supply chain delay, Priya restructured the entire distribution timeline in 48 hours — saving the company roughly $200,000 in expedited shipping costs." That's a recommendation that gets remembered.

Another signal of quality: comparative language. "In my 12 years of teaching, Marcus ranks in the top 5% of students I've supervised" gives the reader a calibration point. Absolute praise is easy to dismiss. Relative praise is hard to ignore.

Writing for different contexts

For a job application

Focus on professional competencies that match the role. If you know what position they're applying for, tailor the examples accordingly. Highlight measurable impact: revenue generated, processes improved, team outcomes affected. Hiring managers want to predict future performance based on past results.

For graduate school or academic programs

Emphasize intellectual curiosity, research aptitude, and capacity for independent work. Academic committees care about how the candidate thinks, not just what they accomplished. If you supervised research, describe their analytical approach and contribution. The graduate school letter of intent guide covers the candidate's perspective if they ask for advice.

For a colleague or peer

Peer recommendations carry weight when they demonstrate what a supervisor wouldn't see — collaboration style, team dynamics, how someone handles pressure when no one senior is watching. Be specific about what it's like to work alongside this person day-to-day.

Common mistakes to avoid

Being too short. Three sentences isn't a recommendation — it signals you couldn't think of enough good things to say. Aim for 400-600 words minimum.

Focusing on yourself. The letter is about them, not your credentials. Establish your authority in 1-2 sentences, then shift the spotlight entirely.

Mentioning weaknesses. Unless specifically asked for areas of improvement (some academic programs request this), don't volunteer negatives. If you can't write a fully positive letter, it's better to decline. A halfway recommendation does more harm than no recommendation.

Using a template without personalizing it. Generic templates are starting points, not finished products. If the person's name could be swapped with anyone else's and the letter would still make sense, you haven't written a recommendation — you've filled out a form.

For the flipside — how to effectively request a recommendation — see the recommendation request guide. And for related formal correspondence, the formal letter format guide covers structure and conventions.

Harvard's Office of Career Services guide offers additional academic recommendation frameworks. For workplace references, SHRM's reference management toolkit covers legal considerations.