RTS Discovery
Advanced BMI Calculator
Instant BMI, category, and healthy weight range — US & Metric. No sign-up.
Enter Your Details
Defaults to US units (feet/inches & pounds). Switch to Metric if you prefer.
Your Results
BMI
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Category
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Healthy Weight Range
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Units
US (lb, ft/in)
BMI Scale
Enter your height and weight to see your BMI and category.
Note: BMI is a screening tool, not a diagnosis. Talk to your clinician for personalized guidance.
What the Categories Mean
- Underweight: BMI < 18.5
- Healthy weight: 18.5–24.9
- Overweight: 25.0–29.9
- Obesity: ≥ 30.0
How is BMI calculated?
US: BMI = 703 × (weight in lb) / (height in in)2
Metric: BMI = (weight in kg) / (height in m)2
Healthy weight range for my height?
We compute the weight range that corresponds to a BMI of 18.5–24.9 for your height.
Limitations of BMI
BMI doesn’t directly measure body fat and may be less accurate for athletes, older adults, and some body types.