Search "best cover letter format" and you'll get templates to fill in. But format isn't decoration — it's what goes where, so a hiring manager who's skimming actually reads the thing. The good news: the structure is simple and it barely changes. The catch is that the structure is the easy part. Here's exactly what goes where, how long it should be, and the honest truth about when a cover letter is worth writing at all — with the research behind it.

Do cover letters still matter?

Short answer: a tailored one does; a generic one mostly doesn't. In a field experiment of more than 7,000 applications by the resume-writing firm ResumeGo, applications with a cover letter written specifically for the job drew a 53% higher callback rate than applications with no cover letter at all [1] — while a generic, one-size-fits-all letter landed barely above sending none.

They do still get read: in a 2023 survey of 625 hiring managers by Resume Genius, 73% said they frequently or always read cover letters even when one isn't required [7]. And skipping one can cost you — in a separate national survey of hiring managers, 10% called a missing cover letter an instant deal-breaker [2]. So the format below is worth getting right — but only if you're willing to tailor what goes inside it.

What goes where

A cover letter is a short business letter, and everything that works about it comes down to a handful of parts in a fixed order [3]:

  • The heading. Your name and contact details, the date, and the company's name — standard business-letter format.
  • The greeting — to a named person. "Dear Ms. Rivera," not "To Whom It May Concern." It's worth the two minutes to find the actual hiring manager: addressing a specific person gives your letter "a greater chance of having your application packet read and not filed away," as Purdue's writing lab puts it [4].
  • The opening. One or two sentences that name the role you want and open with something specific — a strong first line that makes clear you're writing to this company, not a hundred of them [6].
  • The body. One to three short paragraphs connecting your actual experience to what the role needs — not a recap of your resume, but the two or three things that make you a fit for this job [3][6].
  • The close. A brief, confident sign-off — thank them, say you'd welcome the conversation, and stop.

Length and formatting

Keep it short. The target is one page — about 250 to 400 words, in three to four short paragraphs [5][3], a length a reader gets through in well under a minute. Use one-inch margins, a standard font, left-aligned text, and single spacing [3]. If it runs past one page, cut: a hiring manager working through a stack won't read the overflow.

What the templates don't tell you

The format is a template you learn once and reuse forever — that's the easy ten minutes. The part that actually moves the numbers is the tailoring: a letter written for this specific company, mapping your experience to this specific role. The research is blunt about it — the tailored letters drove the callbacks, and the generic ones barely beat sending nothing [1]. Doing that genuinely, for every company in a real search, is hours of writing most people won't sustain — so they send the same generic letter everywhere, which the data says is close to sending none.

…and this is exactly what Hiresling.ai does for you

The format is a template. The tailoring is the work — and it's the work Hiresling.ai does for you. Hiresling.ai takes your real experience and drafts a specific, per-role message that maps to what a given company needs, then sends it from your own inbox — reaching the hiring manager directly, and applying to open roles too — with nothing going out until you approve it. You keep the format; Hiresling.ai does the per-company writing that makes it worth sending.

One honest note: no format, and no tool, guarantees an interview. A well-structured, genuinely tailored letter improves the odds that a hiring manager reads you and takes you seriously — that's the real job of format. What you write still has to be true, and worth their time.

References

  1. ResumeGo, Does a Cover Letter Matter? A Field Experiment (2020) — vendor (resume-writing service); 7,287 applications, three arms (none / generic / tailored). resumego.net
  2. CareerBuilder, Instant Resume Deal-Breakers (2018) — survey of 1,138 hiring and HR managers, conducted by The Harris Poll. prnewswire.com
  3. Purdue OWL, Cover Letters: Formatting and Organization — Purdue University Writing Lab. owl.purdue.edu
  4. Purdue OWL, Addressing Cover Letters — Purdue University Writing Lab. owl.purdue.edu
  5. Indeed Career Guide, What's the Ideal Cover Letter Length? — editorial guidance. indeed.com
  6. Amy Gallo, How to Write a Cover Letter, Harvard Business Review (2014, updated 2020). hbr.org
  7. Resume Genius, Cover Letter Statistics (2023) — vendor; survey of 625 U.S. hiring managers via Pollfish. resumegenius.com