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BMI Calculator — Body Mass Index and What It Means

Calculate your Body Mass Index

Quick Answer

BMI is calculated by dividing weight in kilograms by height in meters squared. BMI ranges: under 18.5 is underweight, 18.5-24.9 is normal, 25-29.9 is overweight, 30 and above is obese. BMI does not measure body fat directly and does not account for muscle mass — athletes often show high BMI despite low body fat.

Body Mass Index (BMI) is a screening tool that uses height and weight to categorize weight status. While widely used in medical settings BMI has significant limitations — it does not distinguish between muscle and fat, does not account for age, sex or ethnicity differences, and is not a direct measure of health. A doctor can provide proper health assessment.

Last updated: June 2026

Pierre
Built by Pierre — MBA, Business Strategist & AI Consultant, Founder of DayblipAbout the author →
Gender
25.1
Overweight
1518.525303540
Your BMI: 25.1
Healthy weight range for your height: 125 lbs – 169 lbs

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⚠️ BMI is a screening tool only and does not directly measure body fat or account for muscle mass. Not medical advice. Consult a healthcare provider for personalized guidance.

Methodology: Uses the standard BMI formula (weight in kg ÷ height in meters²) with CDC weight classification thresholds.

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Frequently Asked Questions

BMI is calculated by dividing weight in kilograms by height in meters squared. In imperial units the formula is weight in pounds multiplied by 703 divided by height in inches squared. This calculator handles both unit systems.

Standard BMI categories are: Underweight below 18.5, Normal weight 18.5 to 24.9, Overweight 25 to 29.9, Obese Class I 30 to 34.9, Obese Class II 35 to 39.9, Obese Class III 40 and above. These categories are defined by the World Health Organization.

BMI does not distinguish between muscle and fat mass. Athletes and muscular individuals often have high BMIs despite low body fat. BMI also does not account for fat distribution — visceral fat around organs carries higher health risk than subcutaneous fat. It is a screening tool not a diagnostic measure.

BMI was developed using data from European populations and may not accurately reflect health risks for all ethnic groups. Some research suggests Asian populations face higher health risks at lower BMI thresholds. Always discuss BMI with a healthcare provider for personal health decisions.