How Long Should an Email Be?

Most people write emails that are too long. Not by a little — by a lot. The average professional email gets read in under 15 seconds. If your email takes longer than that to scan, most of what you wrote won't land.

The right length isn't one number. It depends entirely on what the email is trying to do. But there are clear patterns in what gets read, what gets replied to, and what gets quietly filed away.

# The quick reference

Email type	Ideal word count	Reading time
Quick reply / confirmation	10 – 30 words	< 10 sec
Standard workplace email	50 – 125 words	~30 sec
Cold outreach / sales email	75 – 100 words	~30 sec
Project update / status report	100 – 200 words	~1 min
Detailed brief or proposal	200 – 400 words	1–2 min
Newsletter / email campaign	200 – 500 words	1–2 min
Complex escalation / legal	As long as needed	Varies

# Why shorter emails get more replies

Boomerang analysed over 40 million emails and found that emails between 50 and 125 words had the highest response rates — with the 75–100 word range hitting a peak of 51%. Above 500 words, response rates dropped to 44% and stayed flat from there.

This isn't just about the reader's time. A shorter email signals that you respect it. A long, rambling email puts the cognitive load of extracting the key point onto the reader — and many of them won't bother.

# Cold email is its own discipline

Cold outreach has the tightest length requirements of any email type. You're asking for attention from someone who didn't ask to hear from you. The Boomerang data puts peak response rates for cold email at 75–100 words. More recent analysis focused specifically on cold email suggests an even tighter range — 25–50 words for initial outreach — with longer messages seeing sharply lower engagement.

The structure matters as much as the length: one clear reason you're reaching out, one line of relevance, one specific ask. That's it.

# Newsletter length is different

Email newsletters operate by different rules. Subscribers opted in. They expect content, not just a request. Analysis of over 2.1 million emails found that approximately 20 lines of text — around 200 words — produced the highest click-through rates for most industries.

What matters more than total length for newsletters is scanability. Clear headings, short paragraphs, and a single strong call to action will outperform a wall of well-written prose every time.

# When a long email is the right call

Length rules have exceptions. Some emails genuinely need more words:

Situation	Why length is justified
Detailed project brief	The recipient needs the full picture to act correctly. Brevity here creates mistakes.
Sensitive or difficult conversations	Nuance and context matter. Too short can read as curt or dismissive.
Legal or compliance documentation	Precision is more important than concision. Every word must be right.
Explaining a complex decision	Stakeholders need the reasoning, not just the outcome. A short email leaves questions open.

The test is simple: could cutting words cause the reader to misunderstand, miss something, or need to follow up? If yes, keep the length. If no, cut.

# The subject line is part of the length equation

Email length doesn't start at the first word of the body — it starts at the subject line. A clear, specific subject line sets expectations, front-loads context, and reduces the amount of explanation needed in the body.

Subject lines averaging six words consistently achieve higher open rates than shorter or longer alternatives. Research recommends keeping subject lines under 50 characters, with the key message in the first 33 characters to ensure visibility across devices.

# A practical editing checklist

Before you send, run through these quickly:

Check	What to ask
One ask	Does this email have a single, clear purpose? Multiple asks belong in separate emails.
First sentence	Does the first sentence say something useful? Delete any opener that's just warm-up.
Paragraphs	Is each paragraph doing one thing? Three sentences max per paragraph for workplace email.
Clear ask	Can someone read this email and know exactly what you need from them?
Sign-off filler	"Please don't hesitate to reach out if you have any questions" — delete it. They know.

# The bottom line

For most workplace emails: 50–125 words. For cold outreach: 75–100 words. For newsletters: aim for around 200 words to maximise click-through rate. For anything else, use the minimum number of words that lets the reader understand and act — then stop.

The goal of an email isn't to be thorough. It's to get the right response. Shorter usually wins.

# Research Sources

• Boomerang (2016) — 7 Tips for Getting More Responses to Your Emails (With Data!)
  Analysis of 40 million emails. Emails between 75–100 words achieved a 51% reply rate — the highest of any length bracket. Above 500 words, response rates dropped to 44%.
• Artisan / Lavender (2025) — How Long Should a Cold Email Be?
  Cold-email-specific analysis suggesting 25–50 words for initial outreach produces better engagement than longer approaches, with sharp drop-offs above 100 words.
• Campaign Monitor — Email Length Best Practices
  Analysis of 2.1 million emails via Constant Contact. Approximately 20 lines of text (~200 words) produced the highest click-through rates across most industries.
• Email Analytics — Ideal Email Length (2025)
  Aggregates research on subject line length and body copy. Recommends subject lines stay under 50 characters, with key message within the first 33 characters for full visibility on mobile devices.