ShulahBMI calculator
Body mass index compares your weight with your height. It is a quick check, not a verdict: it cannot tell muscle from fat, so this calculator also shows your FFMI and lean mass.
Estimates for healthy adults (Mifflin-St Jeor · Katch-McArdle · Deurenberg · US Navy · Epley). Not medical advice.
How it is calculated
BMI = weight in kg ÷ (height in m)². Below 18.5 is underweight, 18.5 to 24.9 is the healthy range, 25 to 29.9 is overweight and 30 or more is obesity. FFMI, the fat-free mass index, uses your lean mass instead of your whole weight, so a muscular build is not read as extra fat.
How to read it
If your BMI is high but your FFMI is above average, the extra weight is most likely muscle. For a truer picture, open Body composition and add your waist and neck measurements.