The formula
Weight in kilograms divided by height in metres, squared. 68 kg at 1.65 m is 68 ÷ 1.65² ≈ 25.0.
BMI
calculator.
Check your body mass index and the healthy weight range for your height, with an honest note on what BMI misses.
Your BMI
Fill in your height and weight.
Quick, not perfect
What your BMI
actually says.
The categories
For adults, WHO uses: under 18.5 underweight, 18.5–24.9 healthy, 25–29.9 overweight, 30 and above obesity.
What it misses
Muscle weighs more than fat, so athletes can read “overweight”. It also ignores age, sex and where fat is stored.
Lower points for Asian populations
Risk of type 2 diabetes and heart disease starts lower for many Asian populations, so WHO suggests 23 and 27.5 as action points.
Questions,
answered.
What is a healthy BMI?
For adults, 18.5 to 24.9. Many Asian countries use lower cut-offs, often 23 for overweight.
Is BMI accurate?
It’s a useful quick check across large groups, but it can be wrong for one person. Waist size and how you feel day to day add context. A doctor can tell you more.
Does BMI work for children or during pregnancy?
No. Children and teens need age-and-sex charts, and BMI isn’t used to judge weight during pregnancy. This calculator is for adults.
How does Forward use BMI?
Only as a safety floor: Forward won’t suggest a goal weight below a BMI of 18.5 for your height.
Want to move
the number?
Forward helps you lose weight steadily with a small daily calorie deficit, and never pushes a goal below a healthy weight. It’s coming to iPhone.