Estimate a practical healthy-weight range for adults. Compare the BMI-based range with four established reference formulas, switch between metric and US units, and optionally check where your current weight sits.
Your measurements
Your estimate
| Reference method | Estimate (kg) |
|---|---|
| Devine | 61.4 |
| Robinson | 61.0 |
| Miller | 61.2 |
| Hamwi | 61.7 |
A healthy weight is a range, not one perfect number. The formula results are historical reference estimates and may not reflect body composition, ethnicity, pregnancy, disability, or athletic build.
What is a healthy weight?
For adults, a BMI from 18.5 through 24.9 is commonly described as the healthy-weight range. This calculator converts that BMI interval into a weight range for your height. BMI is useful as a screening measure, but it does not directly measure body fat or distinguish muscle from fat.
How the calculation works
The lower and upper limits are calculated as BMI multiplied by height in metres squared. The comparison table also shows the Devine, Robinson, Miller, and Hamwi reference formulas. These formulas use height and sex-specific constants and were developed for clinical reference—not as universal appearance or health targets.
Why do the formula results differ?
Each formula was developed from a different population and purpose, so its constants are different. Looking at the range and several methods is more informative than treating one result as exact.
Is BMI accurate for athletes?
BMI can classify muscular people at a higher category because it cannot separate muscle from fat. Waist measurements, body-fat estimates, health history, and professional assessment can add context.
Can this calculator be used for children or pregnancy?
No. Children and teenagers require age- and sex-specific growth percentiles. Pregnancy also changes normal weight patterns. Use an appropriate calculator and professional guidance.
Using your result
Treat the result as a broad screening estimate. Sustainable eating, regular movement, sleep, medical history, and changes over time matter more than reaching one formula-generated number.