Rex says
BMI is a crude single number — it doesn't know if you lift, doesn't know your bone structure. Use it as a quick gut-check, not a verdict. If you're an athlete or very muscular, body fat % is the better read.
Try a scenario
Click to load — tweak from there.Inputs
Result
Your BMI
25.8
Category
Overweight
25.8 reads as overweight. Could mean fat, could mean muscle — body fat % tells you which.
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How to read your BMI
- 1Pick Metric or Imperial — your scale and tape measure decide.
- 2Type your weight (lb or kg) and height (in or cm).
- 3Watch the BMI number and category update live as you adjust.
- 4If you're muscular, also check the Body Fat calculator — BMI overcounts lean mass.
About this calculator
BMI is weight in kilograms divided by height in meters squared. Under 18.5 is underweight, 18.5–24.9 normal, 25–29.9 overweight, 30+ obese.
FormulaBMI = kg / m².