BMI & ideal weight calculator
Body mass index and the healthy weight range for your height.
Not medical advice.
How it's calculated
BMI = kg ÷ m². WHO adult categories: <18.5, 18.5–24.9, 25–29.9, ≥30.
- Adults 18+ only
- Does not account for muscle mass; some Asian guidelines use lower cut-offs
Version 1.0 · exact decimal maths · inputs are not stored.
Questions
Is BMI accurate for everyone?
No. It does not distinguish muscle from fat and is for adults only. Some South Asian guidance uses lower cut-offs because health risks can rise at a lower BMI.
What is a healthy BMI?
The WHO adult range is 18.5 to 24.9. Talk to a doctor for advice about your own health.