Average Speaking Rate: What the Research Actually Says

150 words per minute. That's the figure you'll find everywhere, usually credited to the National Center for Voice and Speech, and usually offered without the one piece of context that makes it useful.

150 WPM describes casual American conversation. It does not describe a conference talk, a podcast, a radio bulletin or an audiobook — all of which run at measurably different speeds, for documented reasons. If you're writing to a time limit, the wrong figure will put you minutes out.

There Is No Single Speaking Rate

Any source giving you one number without naming a context is oversimplifying. The defensible ranges look like this:

The slowest legitimate figure and the fastest differ by nearly a factor of three. For a ten-minute talk, picking the wrong end is the difference between writing 1,300 words and writing 1,900.

Where the 150 WPM Figure Comes From

The most-quoted number traces to the National Center for Voice and Speech at the University of Iowa, which puts average conversation among US English speakers at roughly 150 WPM. It's a reasonable figure and it's what most calculators default to.

The problem is what it measures. Conversation is not delivery. In conversation you're interrupted, you overlap, you trail off — and critically, your listener can stop you and ask. None of that is available to someone giving a presentation, recording a voiceover, or reading to camera.

The Study Worth Citing Instead

The most useful research on this is older and far less quoted. Tauroza and Allison published Speech Rates in British English in Applied Linguistics in 1990, measuring four distinct situations — conversations, academic lectures, interviews and radio monologue — rather than treating speech as one activity.

They found an overall rate around 170 WPM, but the variation between contexts was the actual finding. Conversations ran fastest, at 190–230 WPM. Radio monologue, scripted and delivered to an audience that cannot interrupt, ran considerably slower. Their working bands remain the clearest framework available:

Faster Isn't Automatically Worse

The intuition that slower always means clearer turns out to be wrong. Emma Rodero's 2012 study in Text & Talk compared speech rate and pausing across 40 news bulletins from the BBC, Radio France, RAI and RNE, and found the optimal rate for radio news sits between 170 and 190 WPM — well above the conversational average. Below 170, recognition of the message got worse, because delivery became less dynamic and attention dropped. Above 190, listeners struggled with complex content.

News readers sustain 190 WPM because broadcast copy is written to be heard — short sentences, one idea each, names before facts. The pace works because the language underneath is doing the work.

Reading Aloud Sits Between the Two

There's a third rate that most guidance skips entirely, and it's the one that matters most if you're working from a script.

Marc Brysbaert's 2019 meta-analysis in the Journal of Memory and Language reviewed 190 studies covering more than 18,000 participants. Alongside the silent reading figures behind the 225 WPM average, it reports a reading aloud rate of roughly 183 WPM.

Faster than prepared speech, slower than conversation — and the reason is structural. When you read aloud you aren't composing. No hesitations, no false starts, no reaching for a word. What you lose is the natural pausing that comes with thinking, which is exactly why cold-read scripts often sound rushed. The full gap between reading and speaking is covered in speaking time vs reading time.

Why ReadCalc Uses 140 WPM

140 WPM is the default across the script formatter, the teleprompter and the speaking-time estimate on the main calculator. It's a deliberate choice, not a rounded guess.

It's the midpoint of the right band

Tauroza and Allison put average speech at 125–160 WPM. 140 is the middle. For someone planning a talk with no other information, the midpoint of the relevant band is the least wrong single number available.

It errs toward under-running

If your real pace is faster than 140, you finish early — recoverable, and usually welcome. If the default were 170 and your real pace were 140, a ten-minute slot would over-run by three minutes. Speaking slots are hard limits far more often than they're soft ones.

It leaves room for what you didn't script

Almost everyone speaks faster under pressure than in rehearsal — but almost everyone also adds unplanned pauses, corrections and asides. In practice those cancel out and then some.

Speaking Rate by Speech Length

The practical version. Word counts at three paces:

Subtract for anything that isn't you talking. Slides, demos, questions and the pause after a point lands all eat into the count. For a talk with visuals, taking 10–15% off the word target is a sensible starting adjustment.

How to Measure Your Own Rate

Take a passage of your own writing — natural register, not a rehearsed script. Paste it into the calculator for an exact word count, record yourself reading it at the pace you'd use in front of an audience, then divide by the elapsed minutes. Use at least 300 words: shorter samples are dominated by how you start, and everyone starts fast.

Most people land between 120 and 165 WPM. Above 170 you're not necessarily too fast, but your sentences need to be doing more work — run the text through the sentence pacing analyser and look for the long ones. And if your material is dense, the answer isn't to slow down; it's to rewrite it so it can be heard, which is the same conclusion the audiobook comprehension research reaches from the listener's side.

Research Sources

• Tauroza, S. & Allison, D. (1990) — Speech Rates in British English — Applied Linguistics, 11(1), 90–105
  Measured speech rates across conversations, academic lectures, interviews and radio monologue, establishing the slow/average/fast bands still used as a reference. Overall rate around 170 WPM; conversations 190–230 WPM; average speech 125–160 WPM.
• Rodero, E. (2012) — A Comparative Analysis of Speech Rate and Perception in Radio Bulletins — Text & Talk, 32(3), 391–411
  Compared speech rate and pausing across 40 news bulletins from the BBC, Radio France, RAI and RNE. Found an optimal range of 170–190 WPM varying with information density; recognition dropped below 170 WPM as delivery lost dynamism.
• Brysbaert, M. (2019) — How Many Words Do We Read Per Minute? A Review and Meta-analysis of Reading Rate — Journal of Memory and Language
  Meta-analysis of 190 studies covering more than 18,000 participants. Alongside the silent reading figures, reports an average reading-aloud rate of approximately 183 WPM — the bridge between reading and speaking pace.
• National Center for Voice and Speech — University of Iowa
  Source of the widely quoted ~150 WPM figure for average conversational speech among English speakers in the United States. Describes conversation specifically, not prepared delivery.
• Dlugan, A. — What Is the Average Speaking Rate? — Six Minutes
  Analysis of TED talks ranging from under 7 to nearly 20 minutes, finding an average of 163 WPM with two-thirds of talks clustered between 153 and 168 WPM.