Find the adult BMI-based weight range for your height.
The Healthy Weight Range Calculator converts adult BMI thresholds into a weight range for a given height. A BMI of 18.5 to 24.9 is the standard healthy range for adults, and this calculator turns those cut-offs into pounds or kilograms.
Rather than returning a single target weight, the tool shows the full band implied by the BMI range. That makes it easier to see where a given height falls without implying that one exact number is the only healthy outcome.
A range is often more useful than a single target because it reflects the adult BMI category boundaries directly. It gives you a lower and upper reference point for the same height without pretending that one number is universally ideal.
The healthy weight range is derived from the adult BMI formula rearranged to solve for weight: Weight (kg) = BMI × Height (m)² Lower bound: Weight_min = 18.5 × Height(m)² Upper bound: Weight_max = 24.9 × Height(m)² For imperial inputs, height in inches is converted to meters, and the resulting weights in kilograms are converted to pounds.
Result: 128.9 – 173.5 lbs
A person who is 5' 9" (69 inches = 1.7526 m) has a healthy weight range calculated as: Lower = 18.5 × 1.7526² = 56.82 kg ≈ 125.3 lbs, Upper = 24.9 × 1.7526² = 76.53 kg ≈ 168.7 lbs (values may vary slightly with rounding). At 175 lbs their BMI is about 25.8, which is just above the healthy range.
Body mass index is a screening tool that relates weight to height. It does not directly measure body fat, but it remains a standard adult reference in public-health guidance.
The calculator rearranges the BMI formula to solve for weight at the lower and upper adult cut-offs. For a given height, Weight = BMI × height². That produces the minimum and maximum weights that correspond to BMI 18.5 and 24.9.
The output is best treated as a reference band for adults, not as a diagnosis. BMI does not measure body composition directly, so the result is most useful when viewed alongside other measures such as waist circumference.
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This page uses the standard adult BMI equation, rearranged to solve for weight at the lower and upper healthy cut-offs. It calculates the lower bound with BMI 18.5 and the upper bound with BMI 24.9, then converts the result into the selected unit system. The calculator is intended for adult reference use, not child growth charts.
For adults, BMI 18.5 to 24.9 is the standard healthy range used in major public-health guidance.
The adult BMI cut-offs are the same for men and women, so the height-based weight range is the same.
A range shows the actual lower and upper BMI boundaries instead of pretending there is one exact healthy weight for every adult of the same height.
Athletes with significant muscle mass may exceed the upper limit of the range and still be healthy, so BMI should be treated as a screening reference.
No. Children and adolescents use BMI-for-age percentile charts instead of adult cut-offs.
If your weight is outside the range, use the result as a reference point and discuss next steps with a healthcare provider if needed.