A cold email should be 50 to 125 words. That band gets the best response rates across the large studies on email length, long enough to name a problem and give one line of proof without losing the reader.
This page is the short answer, with the data behind the number. For the full method, structure and a worked example, see our guide to writing a cold email.
How long should a cold email be?
A cold email should be 50 to 125 words in the body, not counting the subject line or signature. Pipefire's own writing rules aim for 75 words as the target, inside that same range, because 75 words is long enough to make a case and short enough to read on a phone without scrolling.
The range breaks down like this:
- Under 25 words reads like a template or an auto-reply, with little room for proof.
- 25 to 50 words is workable for a short follow-up but thin for a first email.
- 50 to 125 words is the band every large study puts near the top for response rate.
- 125 to 250 words still works if every sentence earns its place, but risk rises.
- Over 250 words reads as a pitch, and most recipients stop partway through.
Aim at 75 words and let it land anywhere in the 50 to 125 range. Going shorter cuts the room for a problem and a proof line. Going longer risks losing the reader before the ask.
What do cold email length studies say, and where do they disagree?
The two most-cited studies are Boomerang and Gong, and they measured different things. Boomerang studied everyday email, not cold email only, across response rate; Gong studied cold email specifically, split across an older study on meetings booked and a newer one on replies.
| Source | What it measured | Sample | Finding |
|---|---|---|---|
| Boomerang | Response rate, everyday email, not cold-only | 40 million+ emails | 50 to 125 words got response rates above 50%, the best band measured |
| Gong, 2025 | Reply rate, cold email | 28 million+ cold emails | Ideal word count is 100 or fewer; the highest reply rates came from 3 to 4 sentences |
| Gong, earlier study | Meetings booked, cold email | Millions of cold emails | Emails of 30 to 150 words booked more meetings than very short ones |
Boomerang's 40 million emails were everyday email, not cold-only, so treat it as supporting evidence, not a cold-email-specific number. Overloop, pooling over 4 million emails across several outreach tools, found an 8.2% reply rate at 50 to 125 words against 3.9% at 200 to 300 words, lining up with both.
Gong's own two studies do not fully agree with each other. The earlier one found 30 to 150 words booked the most meetings; the 2025 one found replies favor 100 words or fewer, a tighter, lower range for a related but different metric. Lavender goes further and argues for 25 to 50 words, shorter than any range above; its methodology is not public the way Gong's and Boomerang's are, so treat it as a counterpoint rather than a tiebreaker.
The practical read: nobody's data recommends going over 150 words for a first cold email, and nobody recommends going under 25. Inside that span, pick a number near 75 and prioritize a problem line and a proof line over hitting an exact count.
Pipefire's writing rules land inside all three ranges: a minimum of 25 words, a target of 75, and a maximum of 125, set in the campaign writer's copy limits. Every email a campaign writes is checked against those three numbers before it is shown to you for approval.
How long should each email in a cold email sequence be?
Each email in a cold email sequence should be 50 to 90 words, slightly tighter than the 50 to 125 word range for a first email alone. That is the length rule Pipefire's campaign writer applies to every step, opener and follow-ups alike.
| Day | Job | Length | |
|---|---|---|---|
| 1 | Day 0 | Opener and the problem they recognize | 50 to 90 words |
| 2 | Day 3 | A different consequence of the problem | 50 to 90 words |
| 3 | Day 7 | Proof, or how it actually works | 50 to 90 words |
| 4 | Day 14 | A polite close, easy no | 50 to 90 words |
Follow-ups can run shorter than the opener because the reader already has the context. "Saw you opened a second location, any update?" does the job of a follow-up in far fewer words than an opener has to. Our cold email follow-up guide covers what each step should say.
How long should a cold email subject line and preview text be?
A cold email subject line should be 2 to 4 words. Boomerang found 3 to 4 word subject lines got the most responses, and Belkins' subject line study found the same band had the highest open rate, at 46%.
Preview text, the line a mail client shows after the subject, is usually the first 40 to 90 characters of your opening line. Write that line to make sense on its own, since it often doubles as the preview.
How do you read a cold email on a phone?
Most cold email gets opened on a phone first, where a typical screen shows 4 to 6 lines before the reader has to scroll. A 75-word email fits that window; a 200-word email needs two or three scrolls before the ask shows up.
Short paragraphs matter as much as word count: one or two sentences each reads faster on a small screen. Our cold email deliverability guide covers the other side of inbox placement, what happens before the email is even opened.
How do you cut a long cold email down?
Cut a long cold email in this order:
- The self-introduction and job title. Your name is already in the "from" line.
- The second proof point. One result or client detail is enough.
- Any sentence that only makes sense to someone who already works at your company.
- Soft words such as "fantastic", "exciting" or "impressed" that add length but no information.
Here is an invented before-and-after. The business, the numbers and the result are made up to show the edit, not taken from a real campaign.
Before, invented:
Hi Dana, my name is Sam and I run a local SEO agency that helps plumbing companies dominate local map rankings. I noticed your business, Fremont Plumbing Co, recently opened a second location in Fremont, which is fantastic news. New locations typically take six to twelve months to build up the citations and ranking signals needed to show up in the map pack, so you could be losing calls to competitors who already rank there. We recently helped a heating company reach top three map rankings for a new location in about ten weeks. Would you be open to a quick call to discuss doing the same for Fremont Plumbing Co?
After, invented:
Hi Dana,
Saw you opened a second location in Fremont last month.
New locations often take months to show up in the map results, so the calls keep going to whoever ranked there first.
We recently got a heating company with a new location into the top three map results there in about ten weeks.
Is the Fremont shop getting the calls you expected yet?
Sam
The edit removed the self-introduction, the "fantastic news" filler and the soft close, and shortened every remaining sentence. Pipefire's campaign writing applies the same cuts automatically, checking every draft against the word and sentence limits before you see it.
Cold email length FAQ
Is a one-line cold email too short?
Usually, yes. A one or two line email leaves no room for a problem statement or proof, and both Boomerang's and Gong's data show reply and response rates fall below the 50 to 125 word band.
Does cold email length matter more than the subject line?
Both matter, but the subject line decides whether the body gets read at all. A 2 to 4 word subject line with a 75-word body outperforms either a long subject line or a long body on its own.
Should every email in a cold email sequence be the same length?
No. The first email can run up to 125 words to carry the full problem and proof; follow-ups work at 50 to 90 words because the reader already has the context from the first message.
Why do Boomerang and Gong give different cold email length numbers?
Boomerang measured everyday email, not cold email only, and Gong measured cold email specifically across two different studies, one on meetings booked and a newer one on replies. All three land inside roughly the same 25 to 150 word window, but none of them is a perfect match for the others.
What is the shortest a cold email should ever be?
Most of the data treats 25 words as the practical floor. Below that, an email reads like a one-line nudge rather than a message with a reason attached, and reply rates drop accordingly.