body mass index: meaning, definition, pronunciation and examples
B2Technical/Medical, Academic, Everyday (in health contexts)
Quick answer
What does “body mass index” mean?
A numerical value derived from a person's weight and height, used to assess whether their weight falls within a healthy range.
Audio
Pronunciation
Definition
Meaning and Definition
A numerical value derived from a person's weight and height, used to assess whether their weight falls within a healthy range.
A screening tool for categorizing individuals as underweight, normal weight, overweight, or obese, commonly used in public health and clinical settings.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning. The abbreviation 'BMI' is universally used. Spelling is consistent.
Connotations
Neutral and clinical in both varieties. In everyday UK English, one might slightly more often hear 'BMI' without spelling out the full term.
Frequency
Equally common in professional contexts in both regions. Slightly more prevalent in public health discourse in the US.
Grammar
How to Use “body mass index” in a Sentence
The doctor calculated [PATIENT]'s body mass index.A body mass index of [NUMBER] indicates [CATEGORY].According to [SOURCE], the body mass index is [ADJECTIVE].Vocabulary
Collocations
Examples
Examples of “body mass index” in a Sentence
verb
British English
- The nurse will BMI all new patients.
- I need to get BMI'd at the surgery.
American English
- The physician BMIs patients during annual physicals.
- Have you been BMIed recently?
adjective
British English
- The BMI reading was concerning.
- We reviewed the BMI data from the study.
American English
- Her BMI category changed after the lifestyle intervention.
- BMI charts are posted in the clinic.
Usage
Meaning in Context
Business
Rare, except in corporate wellness programmes: 'The company's health initiative includes free body mass index screenings.'
Academic
Common in medical, public health, and kinesiology research: 'The study correlated socioeconomic status with average body mass index.'
Everyday
Used in general health discussions: 'My gym trainer calculated my body mass index today.'
Technical
Precise use in clinical settings: 'Adiposity was assessed using body mass index (weight in kg/height in m²).'
Vocabulary
Synonyms of “body mass index”
Strong
Neutral
Weak
Vocabulary
Antonyms of “body mass index”
Watch out
Common Mistakes When Using “body mass index”
- Using 'body mass index' as an adjective without a hyphen (e.g., 'body mass index calculation' is correct, 'body-mass-index calculation' is less common).
- Confusing it with 'body fat percentage'.
- Pronouncing 'index' as /ɪnˈdeks/ instead of /ˈɪndeks/.
FAQ
Frequently Asked Questions
BMI is a useful population-level screening tool but has limitations for individuals, as it does not account for muscle mass, bone density, or fat distribution.
Divide your weight in kilograms by your height in metres squared (kg/m²). Online calculators simplify this using imperial or metric units.
Generally: Underweight (<18.5), Normal weight (18.5–24.9), Overweight (25–29.9), Obese (≥30).
It can misclassify muscular individuals as overweight and may not reflect health risks equally across different ethnicities or ages.
A numerical value derived from a person's weight and height, used to assess whether their weight falls within a healthy range.
Body mass index is usually technical/medical, academic, everyday (in health contexts) in register.
Body mass index: in British English it is pronounced /ˌbɒdi ˈmæs ˌɪndeks/, and in American English it is pronounced /ˌbɑːdi ˈmæs ˌɪndeks/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “To fall into the obese category on the body mass index chart.”
- “His BMI tipped him into the overweight range.”
Learning
Memory Aids
Mnemonic
Think of it as your body's 'Mass' (weight) being indexed or catalogued against your height.
Conceptual Metaphor
HEALTH IS A NUMBER / THE BODY IS A MEASURABLE OBJECT.
Practice
Quiz
What is the primary clinical use of Body Mass Index (BMI)?