⚖️ BMI Calculator
Calculate your Body Mass Index in metric or imperial units.
BMI Categories (WHO Standard)
Below 18.5: Underweight · 18.5–24.9: Healthy weight · 25–29.9: Overweight · 30 and above: Obese
Frequently Asked Questions
What is a healthy BMI range?
According to the World Health Organization, a BMI of 18.5-24.9 is considered a healthy weight range for
most adults.
Is BMI accurate for everyone?
BMI is a general screening tool, not a diagnostic measure. It doesn't distinguish between muscle and fat,
so it can be misleading for athletes, older adults, or people with high muscle mass.
Guide: understanding your result
- BMI = weight (lb) × 703 ÷ height (in)², or weight (kg) ÷ height (m)².
- For adults, the CDC categories are: under 18.5 underweight, 18.5–24.9 healthy weight, 25–29.9 overweight, 30 and above obesity.
- BMI is a screening measure, not a diagnosis: it does not distinguish muscle from fat and is interpreted differently for children and teens (by age and sex percentiles).
Worked example
An adult who is 5′10″ (70 in) and weighs 180 lb has a BMI of 180 × 703 ÷ 70² = 25.8.
Adult BMI categories (CDC)
| BMI | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 – 24.9 | Healthy weight |
| 25.0 – 29.9 | Overweight |
| 30.0 and above | Obesity |
Common mistakes to avoid
- Applying adult categories to children or teens.
- Treating a BMI result as a health verdict without other measures.
Frequently asked questions
Should I worry if my BMI is high?
Talk with a healthcare provider, who can consider waist size, blood pressure, blood tests and other factors. This calculator does not provide medical advice.
Official sources
Examples are calculated live from the same data the calculator uses and are for education only — they are not financial, tax or investment advice.
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