How many filler words per minute is normal?

Research puts the average at about 5 filler words per minute (one every 12 seconds). Five or fewer per minute does not significantly harm perceived effectiveness.

What is the ideal speaking pace for presentations?

Multiple studies converge on 140-160 words per minute as optimal for audience comprehension. TED Talks average 163 WPM. Comprehension drops significantly above 180 WPM.

How much does eye contact matter in public speaking?

Multiple studies confirm eye contact is a key driver of audience engagement. Speakers who scan the full audience earn consistently higher ratings.

How many people actually fear public speaking?

The most rigorous US study puts lifetime prevalence at 21.2%. UK surveys find 49% report some fear. The widely cited 75% figure likely conflates nervousness with phobia.

Stageum analytics dashboard showing public speaking research data with filler word frequency, speaking pace benchmarks, and eye contact distribution — Platform analytics dashboard presenting research-backed benchmarks on filler word frequency, optimal speaking pace ranges by industry, and eye contact distribution patterns from aggregated coaching data.

Public Speaking by the Data: What Research Actually Says About Better Presentations

TL;DR: Research converges on consistent benchmarks: average speakers use ~5 filler words per minute; optimal pace is 140-160 WPM; eye contact measurably increases engagement; structured practice with feedback produces measurable improvement within a few sessions.

How We Reviewed the Data

We reviewed studies from peer-reviewed journals (Journal of Nonverbal Behavior, Psychological Medicine), quantitative analyses (Quantified Communications' database of 100,000+ speaking samples), and AI speech coaching platform data. The findings are remarkably consistent.

Filler Words: The 5-Per-Minute Baseline

A landmark 2024 PubMed study found 12 filler events per minute significantly damages perceived effectiveness, but 5 or fewer per minute does not. The critical threshold is approximately 1.3% of total words being fillers. Average speakers produce a filler word every 12 seconds (~5 per minute). Top performers cut that to once per minute — a fivefold reduction. Cal Poly study: recordings without filler words scored 5.93/7 vs 3.99 with fillers — a 49% advantage. Common filler words: "um", "uh", "like".

Speaking Pace: The 140-160 WPM Sweet Spot

National Center for Voice and Speech identifies 150-160 WPM as optimal. TED Talks average 163 WPM. A 2024 Journal of Nonverbal Behavior study (6 experiments, N=3,958) confirmed a curvilinear effect: faster speech initially boosts perceived confidence, but the benefit attenuates and eventually reverses at extreme speeds. Best speakers vary their rate dynamically (120 WPM for emphasis, 170 WPM for narrative energy).

Eye Contact: The 30% Engagement Lift

Speakers who maintain eye contact with their full audience consistently earn higher engagement ratings and are perceived as more confident and trustworthy. Common mistake: asymmetrical gaze favoring one side. Conscious scanning across all audience sections is the recommended fix.

Public Speaking Anxiety: The Real Prevalence

National Comorbidity Survey Replication (Ruscio et al., 2008): 21.2% of US adults report lifetime fear of public speaking. YouGov 2023: 49% of UK adults report some fear, 15% describe it as phobia. Key finding: practice with feedback reliably reduces anxiety.

What the Improvement Data Shows

Across multiple AI speech coaching platforms: initial sessions show rapid reduction in filler words (awareness-driven); mid-phase improves eye contact and gestures; sustained practice shows measurable vocal confidence gains.

Sources & Methodology

Parametric evaluation of filler sounds and words — PubMed, 2024 (6 experiments, N=3,958)
Quantified Communications database of 100,000+ spoken communication samples
National Center for Voice and Speech — optimal speaking rate research
National Comorbidity Survey Replication — Ruscio et al., Psychological Medicine, 2008
YouGov RealTime survey on public speaking fears, 2023
Various AI speech coaching platform aggregate data

Stageum has not conducted independent peer-reviewed research. Statistics are from original sources listed above. Stageum is an AI-powered public speaking practice platform.