BMI Explained
Is a BMI of 27 Overweight?
Short answer: yes — a BMI of 27 is classified as "overweight." But the number alone doesn't tell the whole story. Here's what it actually means.
Where a BMI of 27 falls
The World Health Organization (WHO) classifies adult BMI into these ranges. A BMI of 27 sits in the lower part of the overweight band:
| Category | BMI |
|---|---|
| Underweight | < 18.5 |
| Normal | 18.5 – 24.9 |
| Overweight ← 27 is here | 25 – 29.9 |
| Obesity | ≥ 30 |
How much weight to reach a "normal" BMI
To drop from a BMI of 27 to 24.9 (the top of the normal range), the weight you'd need to lose depends on your height. Roughly:
| Height | Weight at BMI 27 | To lose for BMI 24.9 |
|---|---|---|
| 5'4" (163 cm) | ~72 kg / 159 lb | ~6 kg / 13 lb |
| 5'8" (173 cm) | ~81 kg / 179 lb | ~6 kg / 14 lb |
| 6'0" (183 cm) | ~90 kg / 199 lb | ~7 kg / 15 lb |
Is a BMI of 27 actually a health concern?
It is a reason to look at the wider picture, not a diagnosis by itself. Population research associates BMI values in the overweight range with higher average risk, but an individual's risk cannot be inferred from BMI alone. A BMI of 27 can mean different things:
- Muscular people can measure 27+ with relatively low body fat because BMI cannot separate lean mass from fat mass.
- Fat distribution matters. Waist circumference can add useful context; clinical cut-offs vary by sex and ethnicity.
- Other health information matters. Blood pressure, glucose, lipids, fitness, medical history, and weight trend all add context.
For a fuller picture, read BMI vs body fat percentageand our guide to what a healthy BMI is.
Evidence
Sources and research
These sources support the article's general claims. Population studies describe associations and do not predict an individual person's health.
- Obesity and overweight
World Health Organization · WHO fact sheet · 2025
Defines the international adult BMI cut-offs for overweight and obesity.
View source (opens in a new tab) - BMI Frequently Asked Questions
Centers for Disease Control and Prevention · CDC BMI guidance · 2024
Explains that BMI is a screening measure and must be interpreted with other health information.
View source (opens in a new tab) - Body-mass index and all-cause mortality: individual-participant-data meta-analysis of 239 prospective studies in four continents
Global BMI Mortality Collaboration · The Lancet · 2016
Large pooled analysis of BMI and mortality; useful for population-level context, not individual diagnosis.
View source — PMID 27423262 · DOI 10.1016/S0140-6736(16)30175-1 (opens in a new tab) - Accuracy of body mass index in diagnosing obesity in the adult general population
Romero-Corral A, et al. · International Journal of Obesity · 2008
Compared BMI categories with estimated body-fat percentage in 13,601 adults and documented important limitations.
View source — PMID 18283284 · DOI 10.1038/ijo.2008.11 (opens in a new tab)
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