How Long Should a Marketing Email Be? The Word Counts That Convert

The short version: there's no single perfect word count, but the data clusters into three bands: 50 to 125 words for a direct sales ask, 150 to 300 words for a nurture or story email, and anything over 500 words only works if you're sending useful content people asked for. Length isn't the goal. Getting to the point fast enough that someone reads it on a phone in a lift is the goal.

Why "how long" is the wrong first question

Every year someone asks me this on a call and I give them a number, and every year I regret giving them just a number, because the number without context is useless. A 400-word email to cold prospects who've never heard of you will get ignored. A 400-word email to a warm list who bought from you three times and likes your voice will get read to the end and might even get replied to. Same word count, opposite outcomes.

So before you count words, ask what the email is for. Boring answer, but it's the one that changes the number. I split my own emails into three jobs: sell something now, warm someone up, or teach something. Each job has a different natural length, and fighting that is where most people waste their time polishing paragraphs nobody needed.

The three length bands, with real numbers

I've sent enough campaigns through Mailchimp, ActiveCampaign and (in the early days) plain old MailerLite to have a feel for this, but feel isn't proof, so here's what the wider industry data shows too. Boomerang analysed over 40 million emails years ago and found emails between 50 and 125 words got response rates around 50 percent, versus roughly 44 percent for longer ones. That gap holds up in my own sends: my shortest promotional emails (under 100 words, one link, one ask) consistently beat my longer ones on click rate, every single launch.

• 50 to 125 words: direct offer, one call to action, one link. Use this for a webinar reminder, a discount deadline, a "spot open this week" consulting pitch.
• 150 to 300 words: a nurture email with a small story or a single insight, building trust before you ask for anything. This is where most of my newsletter sits.
• 500 words plus: only for content-first sends where the email is the value, not the teaser. Think a mini case study or a genuine how-to. If you go this long, the subject line has to promise exactly that, or you'll get opened once and unsubscribed from twice.

A real example from my own list

Two years ago I ran two versions of the same offer to my own list, an AI workshop with 20 spots. Version one was 340 words, three paragraphs of context, a bullet list of what you'd learn, then the link. Version two was 78 words: one line on the problem, one line on the fix, the link, the deadline. The short one got a 34 percent higher click-through rate. Same offer, same list, same day of the week, sent an hour apart to a split list. The only variable was length and the amount of thinking I was asking people to do before they clicked. People don't read your bullet list of benefits, they scan for the bit that answers "what's in it for me and where do I click", and the shorter email got them there in four seconds instead of forty.

That's the uncomfortable bit nobody likes admitting when they've just spent an hour writing a beautiful 400-word email: most of that beautiful writing is for you, not the reader. It makes you feel like you've earned the sale. The reader doesn't care that you earned it. They care whether the offer is relevant to them right now, in the six seconds they're giving your inbox before Slack pings again.

Where the length gets decided (hint, not in the writing stage)

Here's the part people skip. Length isn't really decided by how much you write, it's decided by how much you cut. My process now is: write the messy full version, everything I want to say, then cut it by a third minimum before I even look at the subject line. If I can't cut a third without losing meaning, the email had too much padding to begin with, and padding is what kills open-to-click rates more than any subject line ever will.

A useful test: read the email out loud on your phone, standing up, the way your subscriber will receive it. If you run out of breath before the ask, it's too long. That sounds glib but it's a reliable filter, because most people read marketing emails the way they read a text message from someone they half know: fast, skimming, ready to swipe away.

Mobile changes the maths completely

Litmus data has shown for years that over 60 percent of email opens happen on mobile, and that number hasn't dropped, it's crept up. On a phone screen, roughly 200 words fills the whole visible area before someone even has to scroll. So if your key ask is buried at word 350, most readers on mobile will never physically see it unless something in the first screen made them want to keep going. This is the single biggest reason short wins so often: it's not that readers are lazy, it's that the format punishes you for burying the lede.

If you're building longer nurture sequences or teaching content by email, I'd also point you to where to learn email marketing from scratch, because the structural habits you build early (one idea per email, ask at the top or the bottom, never buried in the middle) matter more long term than any word count rule.

What determines length in practice

A few real factors that should move your number up or down, more than any general rule:

• List temperature. Cold or purchased-adjacent lists need shorter, safer emails. Warm subscribers who open you regularly will tolerate, and sometimes want, more.
• The ask itself. "Click here for 20 percent off" needs almost no context. "Book a 45-minute strategy call with me" needs enough context that the reader trusts it's worth their time, usually 150 words or more.
• Where they're coming from. If the email links to a landing page, keep the email short and let the page do the persuading. I've written before about whether a landing page should even have navigation links, and the same logic applies to email: don't make the reader do two jobs of thinking, one in the inbox and one on the page. Let the email be the doorway and the page be the room.
• Industry norms. B2B software buyers tolerate longer, more detailed emails than ecommerce shoppers who want speed and a clear discount.

The subject line and preview text do half the work length can't

People obsess over body length and ignore that your subject line and preheader are doing 50 percent of the persuading before anyone reads a single word of the body. A tight, curiosity-driven subject line earns you the open. A specific preview line ("the mistake costing you 3 hours a week", not "new blog post") earns you the first sentence. Get those two right and you can afford a slightly longer body, because you've already proven relevance before the reader opens.

This same discipline of one clear idea rather than five vague ones matters everywhere in marketing, not just email. I see the same mistake on landing pages that try to say everything, and it's the same mistake I see when people try to target too many ideas on one page for SEO too, which is why I wrote about how many keywords you should target on one page. Same rule, different channel: pick one job for the piece of content and let it do that job well.

When long emails outperform short ones

I don't want to pretend short always wins, because that's its own kind of lazy advice. Long emails outperform when:

• You're sending a genuine case study with numbers a reader would bookmark, not skim.
• The audience is highly engaged (past customers, paid community members) and expects depth from you specifically.
• You're building authority in a considered-purchase market, like B2B consulting or high-ticket coaching, where trust is built through demonstrated expertise, not just claimed expertise.

My own weekly newsletter runs 400 to 600 words some weeks, because the people on that list signed up wanting my actual thinking, not a discount code. The mistake is applying that same length to a promotional blast for a workshop or a product launch, where the reader's patience budget is completely different.

A simple step-by-step for deciding your length before you write

1. Name the single job of this email in one sentence. If you can't, you're not ready to write it.
2. Decide the list temperature: cold, warm, or hot (repeat buyers).
3. Pick a starting band: 50 to 125 words for cold sells, 150 to 300 for warm nurture, 500 plus only for hot lists wanting depth.
4. Write messy and long first, get every idea out.
5. Cut by a third. Then cut again if you can.
6. Read it standing up on your phone. If the ask isn't visible in the first screen, move it up.
7. Test two lengths on a split of your list if you have more than 2,000 subscribers. Anything smaller and the data's too noisy to trust.

Tools that make testing this easier

Most of the big platforms (Mailchimp, ActiveCampaign, Klaviyo) let you A/B test subject lines easily but split-testing full body length takes a bit more manual setup, usually two separate campaigns to a randomly split segment. If your current tool makes that painful, it's worth looking beyond the obvious names, and I've covered some of the less talked about options in email marketing tools beyond the obvious choices, several of which make length testing far less fiddly than the big three.

And if all of this feels like one more thing to get right on top of everything else running a small business, that's exactly the kind of practical, unglamorous fix an outside pair of eyes catches fast. It's the sort of thing that comes up constantly when I work with clients through AI consultant for small business engagements, because email length is a five-minute fix that's been quietly costing people opens and clicks for months.

The uncomfortable truth about why we write too long

Here's the bit I'll say plainly because most people writing about email length dance around it: you write long emails because cutting feels like admitting the extra words weren't needed, and that stings a bit, especially if you spent real time on them. I've deleted whole paragraphs I was proud of because they were serving my ego, not the reader's inbox. The email isn't a place to prove you thought hard about this. It's a place to get one person to do one thing. Everything else is you talking to yourself with an audience cc'd in.

This applies well beyond email too. I see it in influencer marketing briefs that try to explain the whole brand history before asking for one Instagram post, and in Pinterest strategies that overexplain the pin instead of trusting the image, which is worth reading about in what Pinterest digital marketing is and how it works. The pattern repeats everywhere marketing meets writing: the version that respects the reader's time is nearly always shorter than the version that makes the writer feel thorough.

For contributors covering this area, read guest post guidelines for marketers.

Related reading: how long ago did twitter become x.

Frequently asked questions

What's the ideal word count for a marketing email?

For a direct sales ask, 50 to 125 words performs best according to Boomerang's analysis of over 40 million emails, which found response rates around 50 percent in that range versus roughly 44 percent for longer emails. For nurture or story emails, 150 to 300 words is the sweet spot. Content-first emails can run 500 words or more if the audience specifically wants depth.

Does a shorter marketing email get more clicks?

Usually yes, for promotional or sales emails, because most readers open on mobile and only see the first screen before deciding whether to keep reading. If your call to action sits at word 300, a large share of your list never reaches it. In my own split test, a 78-word version of the same offer beat a 340-word version by 34 percent on click-through rate.

Should newsletter emails be longer than promotional emails?

Yes, generally. Newsletters go to a warmer, more engaged list who signed up expecting your thinking or your teaching, so 400 to 600 words is reasonable and sometimes preferred. Promotional emails go to a mix of warm and cold readers who just want to know the offer and the deadline, so keep those closer to 50 to 125 words.

How do I test the right email length for my own list?

Split your list randomly into two even segments, send a short version to one and a longer version with the same offer to the other, and compare open rate, click rate, and conversions. You need at least 2,000 subscribers, ideally more, for the results to be statistically meaningful rather than noise. Run the same test across two or three separate campaigns before you trust the pattern.

Where to check the details

• the UK Information Commissioner's guidance on direct marketing