BMI Calculator
Calculate your BMI (Body Mass Index) and weight status.
What is BMI?
BMI (Body Mass Index) is calculated by dividing your weight (kg) by your height (m) squared. The World Health Organization (WHO) uses this index as a simple measure to assess weight status.
BMI Classification
BMI Classification (WHO)
| BMI | Weight Status |
|---|---|
| < 18.5 | Underweight |
| 18.5 – 24.9 | Normal |
| 25.0 – 29.9 | Overweight |
| ≥ 30.0 | Obese |
BMI Classification (Asia-Pacific)
| BMI | Weight Status |
|---|---|
| < 18.5 | Underweight |
| 18.5 – 22.9 | Normal |
| 23.0 – 24.9 | Overweight |
| ≥ 25.0 | Obese |
Asians tend to have higher body fat percentage and metabolic risks at the same BMI. The WHO Asia-Pacific recommendation classifies BMI ≥23 as overweight and BMI ≥25 as obese.
Limitations of BMI
BMI does not account for muscle mass, age, sex, or ethnicity. Athletes with high muscle mass may have a high BMI but low body fat. BMI is a reference indicator — consult a healthcare professional for accurate assessment.
Frequently Asked Questions
What is a healthy BMI range?
According to WHO, a BMI of 18.5–24.9 is considered normal. Under the Asia-Pacific standard, the normal range is 18.5–22.9.
Why is the BMI standard different for Asians?
Asians tend to have higher body fat percentage and greater cardiovascular and diabetes risks at the same BMI. WHO recommends lower thresholds for the Asia-Pacific region.
Does a high BMI always mean obesity?
Not necessarily. People with high muscle mass can have a high BMI but low body fat. BMI is just a reference — a professional body composition analysis is more accurate.
How is ideal weight calculated?
Ideal weight is calculated by multiplying the normal BMI range by height (m) squared. For example, at 170cm the healthy weight range is approximately 53.5–72.0kg (WHO) or 53.5–66.2kg (Asian standard).
Which is more accurate: BMI or body fat percentage?
Body fat percentage is more accurate. While BMI is easy to calculate, it doesn't reflect muscle mass or bone density. A body composition analysis is recommended for precise health assessment.
Does the BMI standard vary by age?
The same BMI standard applies to adults (18 and over). Children and adolescents use separate growth-adjusted charts.