BMI (body mass index) = weight(kg) ÷ height(m)^2. It’s a quick, population-level screening metric for weight status.

What are BMI limitations?

BMI doesn’t separate fat from muscle and ignores fat distribution. Athletes, older adults, pregnancy, and children need better context or different tools.

What should I track alongside BMI?

Consider waist/WHR, body-fat estimate, weight trend, and training performance—not BMI alone.

Tools

BMI Calculator

Enter height and weight to calculate adult BMI category (not for children or pregnancy).

Open tracker

Use together

WHR Calculator
Body Fat Estimator (US Navy)
Maintenance Calories / TDEE

Note: Children and teens require age/sex percentiles. Try our Kids BMI percentile calculator →

Read the guide