Body Mass Index — understand your weight status relative to your height. Based on World Health Organization (WHO) clinical guidelines for BMI classification. Reviewed by the HealthGuide medical advisory team.BMI Calculator
Frequently asked questions
What is a healthy BMI?
A BMI between 18.5 and 24.9 is considered healthy for most adults. Below 18.5 is underweight; 25–29.9 is overweight; 30 and above is classified as obese.
Why doesn't BMI account for muscle mass?
BMI is a ratio of weight to height squared. It cannot distinguish between muscle and fat, so very muscular individuals may show an elevated BMI despite low body fat. Pair BMI with a body fat calculator for a more complete picture.
How often should I check my BMI?
Every 4–8 weeks is reasonable if you are actively working toward a weight goal. Weekly tracking can create unnecessary anxiety since short-term fluctuations reflect water, not tissue changes.
Is BMI accurate for all ethnicities?
Research suggests lower health-risk thresholds for people of Asian descent (overweight: ≥23, obese: ≥27.5). Discuss ethnicity-adjusted cutoffs with your healthcare provider if relevant.
Put it all together
The Health Planner reads your data and gives you exactly 3 actions for today.