Is your weight in a healthy range?
A clear answer, not just a number
Example: A 5'8" person weighing 160 lbs has a BMI of 24.3 — right in the healthy range. The healthy weight range for that height is 126–163 lbs.
Medical Disclaimer: This tool provides general educational estimates. Always consult your prescribing physician or healthcare provider before making medication changes or interpreting results from population-based models.
Frequently Asked Questions
A BMI between 18.5 and 24.9 is considered healthy by the WHO. However, BMI alone doesn't tell the full story — it doesn't account for muscle mass, bone density, or body fat distribution.
No. BMI often misclassifies muscular individuals as overweight or obese because it cannot distinguish between muscle and fat. A 2012 study found BMI misclassified 48% of women and 25% of men compared to body fat measurements.
BMI equals your weight in kilograms divided by your height in meters squared. In imperial units: BMI = 703 × weight (lbs) ÷ height (inches)². Both formulas give the same result.
BMI doesn't measure body fat directly. It ignores muscle mass, bone density, age, sex, and ethnic differences. A 2016 study found over 54 million Americans classified as overweight or obese by BMI were actually metabolically healthy.
Healthy weight depends on height. For example, at 5'8" a healthy weight range is roughly 126–163 lbs (BMI 18.5–24.9). Use this calculator to find the healthy range for your specific height.
Sources
- World Health Organization. Obesity: preventing and managing the global epidemic. WHO Technical Report Series 894. 2000. Link
- Nuttall FQ. Body Mass Index: Obesity, BMI, and Health: A Critical Review. Nutr Today. 2015;50(3):117-128. Link
- Flegal KM, Kit BK, Orpana H, Graubard BI. Association of all-cause mortality with overweight and obesity using standard BMI categories. JAMA. 2013;309(1):71-82. Link
- Tomiyama AJ, Hunger JM, Nguyen-Cuu J, Wells C. Misclassification of cardiometabolic health when using body mass index categories. Int J Obes. 2016;40(5):883-886. Link
- NHLBI. Clinical Guidelines on Identification, Evaluation, and Treatment of Overweight and Obesity in Adults. NIH. 1998. Link
Methodology
This calculator uses the standard BMI formula adopted by the WHO: BMI = weight (kg) ÷ height (m)². For imperial inputs: BMI = 703 × weight (lbs) ÷ height (in)².
Weight categories follow the WHO classification: underweight (below 18.5), healthy weight (18.5–24.9), overweight (25.0–29.9), and obese (30.0+). The healthy weight range is derived by solving the BMI formula for weight at the 18.5 and 24.9 thresholds given the user's height.
BMI is a population-level screening tool. It does not measure body fat directly, cannot distinguish muscle from fat, and may misclassify athletes, older adults, and certain ethnic groups.
Body Mass Index (BMI) is calculated by dividing weight in kilograms by height in meters squared. A BMI of 18.5 to 24.9 is considered a healthy weight by the WHO. BMI above 25 is classified as overweight, and above 30 as obese. However, BMI has significant limitations: it cannot distinguish between muscle and fat, does not account for body fat distribution, and may be inaccurate for athletes, older adults, and certain ethnicities. A 2016 study found that over 54 million Americans classified as overweight or obese by BMI were actually metabolically healthy.
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