A cover letter should be one page long

A cover letter should be one page long, and in practice that means a header plus four or five short paragraphs. The ceiling is a formatting convention rather than a rule anyone enforces, but it is the one nearly every published career-office guide settles on, and it holds whether you have two years of experience or twenty. The harder question is how to spend the space.

Half a page of specific, checkable claims about your work beats a full page of adjectives. Length is a container. What goes in it decides whether the letter gets read past the first line.

The one-page ceiling

MIT's Career Advising and Professional Development office puts the limit plainly: a cover letter should be no longer than one page, set in a font between 10 and 12 points. The same page gives the internal shape: an introduction in the first paragraph, a body of two to three paragraphs, and a closing paragraph.

That structure is where the one-page figure comes from. Five paragraphs at a readable size fill roughly one page with one-inch margins, so the page limit and the paragraph count are the same instruction stated two ways. If you find yourself shrinking the font to 9 points to make it fit, the letter has one paragraph too many.

Nothing breaks if you run to a page and a half. The letter simply gets skimmed instead of read, and the paragraph you cared most about is the one that falls below the fold.

Paragraph structure inside one page

Purdue's Online Writing Lab describes a cover letter in four parts: the heading, the introduction, the argument and the closing. The heading carries your contact details, the date and the employer's address, and it eats more space than most writers expect.

Here is how the page divides once you accept that:

• Heading: contact details, date, employer address.
• Introduction: the role you are applying for and why you, in two or three sentences.
• Argument: two or three paragraphs, each built on one piece of evidence from your record.
• Closing: what you want to happen next, and a thank you.

The argument section is the only part where extra length buys anything. If you are cutting, cut the introduction first. A sentence explaining that you saw the posting on a job board is a sentence that says nothing about you.

Formatting that decides how much fits

Purdue's formatting guidance is specific: single-space the letter, leave a blank line between paragraphs, use standard one-inch margins on all sides, and leave three spaces between the closing and your typed name. Those four choices, not your word count, determine how much text a page holds.

The blank lines matter more than writers expect. Four paragraph breaks plus the space around the heading and signature take up a meaningful share of the page before a single word is set. That is why a letter that looks short in a text editor overflows the moment it is formatted properly.

Do not go below a 10 point font or below one-inch margins to buy space. Both changes are visible immediately to anyone who reads applications regularly, and both signal the same thing: the writer had more to say than the format allows and chose to hide it rather than edit it.

Shorter letters and when they work

Three paragraphs and half a page is a legitimate cover letter. It works when the posting is junior, when the application is one of many for a similar role, or when the hiring contact has asked for a brief note rather than a formal letter.

The short version keeps the introduction and one argument paragraph, then closes. What it drops is the second and third pieces of evidence. That is a real cost, so make the surviving example the strongest one: a number, a shipped project, a named system, something the reader can picture.

Email changes the maths again. When the letter is the body of an email rather than an attachment, the heading collapses to a subject line and a greeting, and the whole thing should fit in a phone screen or two.

The exceptions that justify more space

Academic cover letters run longer by convention, often to two pages, because they carry research and teaching statements that have nowhere else to go. Federal applications in the United States follow their own rules and frequently ask for far more detail than a private-sector letter would ever carry.

A career change is the third case, and it is the one most people get wrong. Switching fields does not entitle the letter to a second page. It changes what the argument paragraphs are for: instead of showing depth in the same work, they have to connect the old work to the new role, which usually needs fewer words rather than more.

Length against the time a letter gets read

Volume explains why the ceiling exists. The Bureau of Labor Statistics counted 7.3 million job openings on the last business day of July 2026, a rate of 4.4 percent, against 5.1 million hires during that month. Every one of those hires sat at the end of a pile of applications that somebody had to work through.

On the other side of the same market, the Bureau reported an unemployment rate of 4.1 percent in August 2026, with 7.0 million people unemployed and 1.9 million of them jobless for 27 weeks or more, 27.0 percent of the total. Long searches mean high application volumes per person, and high volumes on both sides mean the first screen of your letter is the only part with a guaranteed reader.

That first screen is the introduction and the opening line of your first argument paragraph. Write those two things last, once you know what the rest of the letter proves.

The first things to cut

Start with any sentence that restates the job description back to the employer. Then remove the sentence describing your enthusiasm, the sentence naming your degree if it is already on the resume, and any adjective doing the work a number could do.

A concrete example. A four-sentence opening that reads "I am writing to apply for the Senior Analyst position advertised on your careers page. I have long admired your company's work in the sector. I believe my background makes me an excellent fit. I am a highly motivated and detail-oriented professional." carries no information at all. Replaced with "I am applying for the Senior Analyst role. I spent the last three years running the monthly reporting cycle for a 40-person sales organisation, and cut the close from nine days to four." it is half the length and says something.

Run that edit through the whole letter and the one-page question answers itself. If the letter still overflows after every empty sentence is gone, the remaining material belongs on the resume or in the ATS-friendly resume itself, where a reader can scan it in the order they choose.