Quick answer: the grammatically correct form is “4 years’ experience”, with an apostrophe after the “s” in “years.” Most people write “4 years experience” with no apostrophe at all, and while that version is everywhere on resumes and job ads, it’s technically missing a possessive mark that formal grammar calls for.
This mistake is one of the most common apostrophe slips in professional writing, right up there with “its” versus “it’s.” Here’s what’s actually going on, and how to handle it depending on where you’re writing.
The Short Answer
“4 years’ experience” is the grammatically precise form. The apostrophe treats “years” as a possessive-like measurement, similar to “a day’s work” or “two weeks’ notice.” Without it, “4 years experience” reads as two nouns stacked together with nothing showing their relationship, which is grammatically loose even though everyone understands the meaning.
In practice, “4 years experience” without the apostrophe is so widely used on resumes, LinkedIn profiles, and job postings that it rarely gets flagged as an error by readers. But if you’re writing something that will be graded, edited, or scrutinized by a stickler, use the apostrophe.
Why the Apostrophe Belongs There
Grammarians call this a “genitive of measure” or “time possessive.” It works the same way as these familiar phrases:
- A day’s pay
- Two weeks’ notice
- A moment’s notice
- Ten years’ worth of savings
In each case, the time period isn’t literally “owning” the noun that follows, but English treats it as a possessive relationship anyway. “4 years’ experience” means experience of four years, so the apostrophe signals that link. Drop the “s” test to check it yourself: “one year’s experience” clearly needs the apostrophe before the “s,” and pluralizing to “years'” just moves it after the “s.”
Where People Get It Wrong
The confusion happens because “years” here doesn’t feel like a true possessive — nobody thinks “years” owns “experience” the way “John owns a car.” That mental gap is exactly why so many writers skip the apostrophe. Add to that the fact that “experience” isn’t a physical object, and the possessive logic feels even less intuitive. It’s a rule people forget because it doesn’t match how we think about ownership in everyday speech.
Examples in a Sentence
- She has 4 years’ experience in digital marketing.
- The role requires a minimum of 4 years’ experience in project management.
- With 4 years of experience in customer service, he felt ready for a leadership role.
- I have 4 years experience managing remote teams. (common, but technically missing the apostrophe)
The Easiest Fix: Skip the Apostrophe Entirely
If you want to sidestep the debate altogether, rewrite the phrase as “4 years of experience.” This version is fully correct, sounds natural, and never requires you to remember where the apostrophe goes. Many style guides and resume coaches recommend this phrasing specifically because it avoids the whole issue.
| Version | Correctness | Best Use |
|---|---|---|
| 4 years’ experience | Grammatically correct | Formal writing, cover letters |
| 4 years of experience | Fully correct, no apostrophe needed | Resumes, everyday writing |
| 4 years experience | Common but missing apostrophe | Casual use, job ads (widely tolerated) |
What to Use on a Resume
Resumes favor brevity, and hiring managers rarely dock points for the missing apostrophe since it’s so common in job postings themselves. Still, if you’re writing a bullet point like “4 years’ experience in B2B sales,” the apostrophe is a small detail that signals careful proofreading. If you’d rather not think about it, “4 years of experience” is the safest, cleanest choice and reads just as professionally.
Key Takeaways
- “4 years’ experience” is the grammatically correct form, using an apostrophe after “years” to show a possessive-style time relationship.
- “4 years experience” without the apostrophe is extremely common and widely understood, though technically incomplete.
- “4 years of experience” avoids the apostrophe question entirely and is always correct.
- The same rule applies to similar phrases like “two weeks’ notice” and “a day’s pay.”
- On a resume, any of these versions will be understood — but the apostrophe shows attention to detail.
Frequently Asked Questions
Is it “4 years experience” or “4 years’ experience”?
“4 years’ experience” is grammatically correct, with the apostrophe after “years” marking a possessive time expression. “4 years experience” without the apostrophe is common in casual and professional writing but is technically incomplete.
Do I need an apostrophe in “4 years experience” on a resume?
Not strictly, since resumes prioritize clarity and brevity over strict grammar. Many recruiters won’t notice either way, but adding the apostrophe or rephrasing as “4 years of experience” is a safer, more polished choice.
Why does “years” need an apostrophe before “experience”?
Because it functions like a possessive of measurement, the same pattern as “two weeks’ notice” or “a day’s work.” The time period is treated as possessing the noun that follows it, so English grammar calls for the apostrophe.
Is “4 years of experience” more correct than “4 years’ experience”?
Neither is more correct grammatically — both are fully acceptable. “4 years of experience” is simply easier because it removes the need to place an apostrophe at all.
Where does the apostrophe go: “4 year’s experience” or “4 years’ experience”?
Since “years” is plural, the apostrophe goes after the “s”: “4 years’ experience.” “4 year’s experience” would only apply if you meant a single year, as in “one year’s experience.”
Small punctuation choices like this one rarely make or break a resume, but they do add up. If phrases like these trip you up often, it’s worth browsing more grammar breakdowns here to keep your writing sharp.
