BMI Calculator
Body Mass Index — check where you stand
Calculate your Body Mass Index based on your height and weight. BMI is a widely used screening tool — not a diagnostic measure — to categorize weight status and associated health risks.
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For context only
Disclaimer: This calculator provides estimates for educational and informational purposes only. It does not constitute tax, legal, financial, or medical advice. Results depend on individual circumstances and may not reflect your actual costs. Always consult a qualified professional (CPA, licensed insurance agent, or financial advisor) for decisions about your specific situation. Data reflects approximate 2026 figures from IRS, CMS, and HHS sources.
Understanding Body Mass Index (BMI)
Body Mass Index is a simple calculation using your height and weight to estimate whether you are in a healthy weight range. The formula is weight in kilograms divided by height in meters squared. While BMI does not directly measure body fat, it correlates with more direct measures and is used worldwide as an initial screening tool.
BMI was developed in the 1830s by Belgian mathematician Adolphe Quetelet and adopted by the World Health Organization as the standard classification system for weight status. Despite its limitations, it remains the most widely used screening tool because of its simplicity and strong population-level correlation with health outcomes.
BMI Limitations
BMI does not distinguish between muscle and fat mass. A bodybuilder and an obese person of the same height and weight would have identical BMIs despite very different body compositions. For a more complete assessment, consider using our Body Fat Calculator alongside BMI, and consult a healthcare provider for personalized evaluation.
Planning for Health Costs?
Understanding your health status is the first step. The next is understanding what healthcare will cost you. Use our Insurance Out-of-Pocket Calculator to see what you would actually pay for medical care, or our HSA Calculator to save on health expenses tax-free.
Sources: WHO, CDC, NIH, American College of Obstetricians and Gynecologists. This calculator is for educational purposes only and is not a substitute for professional medical advice.
Frequently Asked Questions
What is a healthy BMI?
A healthy BMI for adults is between 18.5 and 24.9. Below 18.5 is considered underweight, 25-29.9 is overweight, and 30 or above is classified as obese. BMI does not account for muscle mass, bone density, or body composition.
How accurate is BMI?
BMI is a useful screening tool but not a diagnostic measure. It does not distinguish between fat and muscle mass, so athletes may have a high BMI despite low body fat. For a more complete picture, consider body fat percentage, waist circumference, and overall fitness level.