What Is a Healthy BMI Range for Adults?
BMI chart: categories and what they mean
| BMI | Category | What it generally means |
|---|---|---|
| < 18.5 | Underweight | May signal undernutrition; higher risk of weak bones, anaemia, low immunity |
| 18.5 – 24.9 | Healthy weight | Lowest average risk of weight-related disease for most adults |
| 25.0 – 29.9 | Overweight | Moderately raised risk of high blood pressure, type 2 diabetes, joint strain |
| 30.0 – 34.9 | Obesity class 1 | Higher risk; health benefits from even 5% weight loss |
| 35.0 – 39.9 | Obesity class 2 | High risk; medical support often recommended |
| ≥ 40 | Obesity class 3 | Very high risk; specialist care options available |
Asian-specific BMI cut-offs
Research shows that people of South Asian, Chinese, and some other Asian backgrounds tend to develop conditions such as type 2 diabetes at lower BMIs. WHO expert consultation and the UK's NICE suggest these lower action points:
| Category | Standard (WHO) | Asian populations (WHO expert / NICE) |
|---|---|---|
| Healthy | 18.5 – 24.9 | 18.5 – 22.9 |
| Overweight / increased risk | 25 – 29.9 | 23 – 27.4 |
| Obesity / high risk | ≥ 30 | ≥ 27.5 |
Does age change the healthy range?
- Adults 18–64: the standard 18.5–24.9 range applies.
- Adults 65+: some studies link a slightly higher BMI (roughly 23–29) with lower mortality, possibly because extra reserves help during illness. Ask your doctor what's right for you.
- Children & teens: adult categories don't apply. BMI-for-age percentiles are used instead (healthy = 5th to under 85th percentile).
Where does your BMI fall?
Get your BMI, category, and healthy weight range for your height in seconds.
Outside the healthy range? Practical next steps
If your BMI is 25 or higher
- Check your waist too. Waist over ~94 cm (37 in) for men or ~80 cm (31.5 in) for women adds risk. Try the Waist-to-Hip Ratio Calculator.
- Aim for 5–10% loss first. Losing just 5% of body weight improves blood pressure, blood sugar, and cholesterol for many people.
- Use a moderate deficit. 300–500 kcal/day below maintenance is sustainable. See what is a calorie deficit? and the Calorie Deficit Calculator.
- Keep protein high and lift weights to protect muscle. See high protein for weight loss.
If your BMI is below 18.5
- Talk to a doctor to rule out underlying causes.
- Eat in a small calorie surplus with nutrient-dense foods. The Calorie Surplus Calculator can help.
- Add strength training so extra weight comes as muscle.
Frequently asked questions
What is a healthy BMI range?
For most adults, a healthy BMI is 18.5 to 24.9, according to the WHO and CDC. Some guidelines use a lower upper limit (around 23) for people of South Asian, Chinese, and some other Asian backgrounds because health risks start at lower BMIs.
Is a BMI of 25 bad?
A BMI of 25 is the start of the overweight range, which is linked to a modestly higher risk of conditions like high blood pressure and type 2 diabetes. It is not a diagnosis. Waist size, activity, diet, blood pressure, and blood tests give a fuller picture of your health.
Does the healthy BMI range change with age?
The standard adult categories are the same at every adult age. Some research suggests a slightly higher BMI (around 23–29) may be associated with lower risk in adults over 65, so older adults should discuss their ideal range with a doctor.
What BMI is considered underweight?
A BMI below 18.5 is classed as underweight. Being underweight can be linked to nutrient deficiencies, weaker bones, lower immunity, and fertility problems, so it is worth discussing with a healthcare professional.
Sources
- CDC: Adult BMI Categories
- WHO Expert Consultation. Appropriate body-mass index for Asian populations and its implications for policy and intervention strategies (Lancet, 2004)
- NICE: Overweight and obesity management
- Winter JE, et al. BMI and all-cause mortality in older adults: a meta-analysis (Am J Clin Nutr, 2014)
- CDC: Child and Teen BMI Categories
This article is for general education and is not medical advice. BMI is a screening tool and does not diagnose health conditions. Talk to a healthcare professional about your individual weight and health. See our medical review policy and disclaimer.