BMI Calculator
Enter your height and weight to get your body mass index and where it sits on the standard scale.
Understanding BMI
BMI is weight divided by height squared (kg/m²). The widely used adult ranges are: under 18.5 underweight, 18.5–24.9 healthy, 25–29.9 overweight, and 30+ obese. BMI is a quick screening number, not a diagnosis — muscle mass, age and body composition all matter, so use it as a starting point rather than a verdict.
Formula used
Healthy range is 18.5–24.9 for most adults.
How to use this tool
- 1Choose your unit system.
- 2Enter your weight and height.
- 3Optionally add age and sex for calorie estimates.
- 4Tap Calculate for your BMI, category and plan.
Frequently asked questions
What is a healthy BMI?
For most adults, a BMI between 18.5 and 24.9 is considered the healthy range by the WHO classification.
Is BMI accurate for athletes?
Not always. BMI cannot distinguish muscle from fat, so muscular people may show as overweight despite low body fat. Treat it as a screening number.
Does this calculator support feet and inches?
Yes — switch the units dropdown to Imperial to enter weight in pounds and height in feet and inches.