“Only 7% of communication is the words. 38% is tone. 55% is body language.” You’ll hear this at sales seminars, presentation workshops and NLP courses. It sounds scientific. It’s also misquoted.
Where the numbers come from
They come from experiments by psychologist Albert Mehrabian in the late 1960s. Participants heard single words, such as “dear” or “terrible”, spoken in different tones of voice, and saw photographs of faces. They were asked how the speaker felt.
When the word, tone and face disagreed, people leaned most on the face, then the tone, then the word. The ratios (7%, 38%, 55%) were for judging feelings and attitudes, specifically liking, when the messages were inconsistent.
What the rule does not mean
Nothing in the research suggests that the ratio applies to communication as a whole. If it did, you could understand a speech in a language you don’t speak, as long as the speaker had an expressive face.
The experiments used single words, not conversation. Mehrabian has been reported as saying the rule is not meant to be applied to communication in general, and many communication researchers have since criticised its use.
Other myths you’ll hear
“You can read people like a book.” A single gesture is ambiguous. Crossed arms might mean defensive, or cold, or comfortable. Context and a person’s baseline matter.
“Eye movements show lying or thinking style.” Tested and not supported (NLP part 7).
“Liars fidget and avoid eye contact.” People are typically only slightly better than chance at spotting lies, and no single cue is reliable. Many liars stay calm, while many honest people are nervous.
“Mirror everything and they’ll trust you.” Natural mimicry helps a little. Obvious copying can feel odd (NLP part 4).
“Everyone has a preferred sense.” Not supported by research (NLP part 8).
“Power poses change your hormones.” A well-known 2010 study claimed this, but later attempts did not replicate the hormone effects, and the original authors have distanced themselves from some of the claims. Standing tall may still help you feel a little more confident, but the evidence is mixed. (From general knowledge; not checked here.)
What is true about body language
- Tone, face and posture do carry meaning, especially emotion.
- Mismatches are noticed. If your words say “I’m fine” and your face says otherwise, listeners pick up on it.
- Warmth is felt. A relaxed face, open posture and a steady voice help people feel at ease.
- Clarity of words matters a great deal. Content is not 7% of anything.
How to use this
- Don’t try to decode strangers. Ask instead of guessing.
- Notice changes from a person’s own baseline, not isolated signals.
- Work on congruence. Make sure what you say, how you say it and what you do all point the same way.
- Be sceptical of any statistic that is neat, round and unreferenced.
The bottom line
The 7-38-55 rule is a half-remembered result from a narrow experiment. Body language matters, but it’s not a code, and words are far more than 7% of what we communicate.
Next in the series: Modelling: Learning from an Expert, the NLP Way
This article is for general information and is not medical advice.