Two pages for most people. One if you have under about three years of experience. Three or more only in academia, medicine, law and senior technical roles where a publication or project list is expected.
That is the whole answer. What follows is why the one-page rule is repeated so insistently, and why following it too literally makes resumes worse.
Where the one-page rule came from
It is a genuine piece of advice aimed at a genuine problem, applied far outside the situation it was meant for. It comes from US campus recruiting, where a recruiter with two hundred near-identical graduate applications and no way to distinguish them benefits enormously from everyone being brief. For a graduate with one internship, one page is right, there is not two pages of relevant material.
For someone with twelve years across four employers, compressing to one page means deleting the evidence that makes them worth interviewing. The rule survives because it is memorable and sounds disciplined, not because it holds generally.
The real constraint is the top third
Here is what actually happens: a recruiter reads from the top and stops when they have decided. That decision usually comes in the first third of the first page.
So length is not really what matters, order is. A two-page resume whose first third makes the case for this specific role performs well. A one-page resume that opens with an education section from 2014 does not, however admirably brief it is.
This reframing is more useful than a page count. Instead of asking "is this too long?", ask "if they stop reading after the first ten lines, have they seen the best argument for me?"
What to cut, in order
Anything from more than fifteen years ago. Old roles become one line each: title, employer, dates. Nobody needs your responsibilities from 2009.
Duties rather than outcomes. "Responsible for monthly reporting" describes a job description. "Cut the monthly close from nine days to four" describes you.
Skills everyone has. Microsoft Office, email, "good communication skills". These take space and signal nothing.
The objective statement. "Seeking a challenging role where I can grow" tells the reader nothing they did not assume. A short summary of what you actually do is worth the space; an objective is not.
References available on request. Assumed since about 1995.
What not to cut
Dates. Removing them to disguise a gap or your age is transparent, and it breaks the employment timeline recruiters filter on, so you disappear from searches for years of experience. See what an ATS actually does.
The specifics. Numbers, technologies, team sizes and named systems are what make you credible and searchable. They are also what people delete first when squeezing onto one page, which is exactly backwards.
White space. Shrinking to 8pt with quarter-inch margins to claim one page produces something nobody wants to read. Two comfortable pages beat one unreadable one.
The formatting temptation to resist
The commonest way to fit more on a page is a two-column layout, a narrow sidebar for skills, a wide column for experience. It genuinely uses the space better.
It also breaks parsing. The columns share baselines, so the software reads across them and welds your job title to an unrelated skill. You have optimised the page for a human who may never see it, at the cost of the software that decides whether they do. The mechanism is in the two-column guide, and the ATS checker will show you whether yours is affected.
By situation
| You are | Length |
|---|---|
| A student or recent graduate | One page |
| Three to fifteen years in | Two pages |
| Senior, or fifteen years plus | Two, with older roles reduced to a line each |
| Academic or medical | As long as the publication list requires |
| Applying in Germany or much of the EU | Two, and check local conventions on photos and personal details |
And if the posting states a length, follow it. That is not a convention to weigh up, it is an instruction, and ignoring it is the first thing an assessor notices.