How to use the BMI calculator
- Choose metric or imperial.
- Enter your height and weight — your BMI and category update instantly.
BMI categories
- Under 18.5 — Underweight
- 18.5 – 24.9 — Healthy weight
- 25 – 29.9 — Overweight
- 30 and above — Obese
BMI is a general guide, not a diagnosis. It doesn't account for muscle mass or body composition. Talk to a doctor for personal health advice.
Frequently asked questions
What is a healthy BMI?
For most adults, a BMI between 18.5 and 24.9 is considered healthy.
Is the BMI calculator free?
Yes, completely free with no sign-up.