Ideal Weight Calculator in kg
Compare four historical adult ideal-body-weight equations in kilograms and place their results beside a broader BMI-based weight interval for your height.
Written and checked by TheToolNet Editorial Team · Last reviewed: October 2, 2026 · Editorial method
These results are rough adult formula estimates, may be inaccurate for you, and are not a diagnosis or a personal weight target. Consult a doctor or registered dietitian before changing weight, diet, medication, or treatment. Do not use this tool during pregnancy, for anyone under 20, or in place of care for an eating disorder.
Calculate adult ideal-weight formulas in kg
Why there is no single ideal weight
Devine, Robinson, Miller, and Hamwi use different constants, so the same adult height produces different answers. They were developed largely for clinical calculations and height-weight comparisons—not to determine appearance, fitness, or a guaranteed healthy target. The calculator shows the spread instead of hiding that disagreement.
Formulas used
| Formula | Male equation | Female equation |
|---|---|---|
| Devine | 50 + 2.3 kg/in over 5 ft | 45.5 + 2.3 kg/in over 5 ft |
| Robinson | 52 + 1.9 kg/in | 49 + 1.7 kg/in |
| Miller | 56.2 + 1.41 kg/in | 53.1 + 1.36 kg/in |
| Hamwi | 48 + 2.7 kg/in | 45.5 + 2.2 kg/in |
A peer-reviewed review of ideal-body-weight equations tabulates the major formulas and their historical uses.
Ideal-body-weight formulas versus BMI
The BMI interval is wider because it relates weight to squared height rather than selecting one formula result. BMI is still only a screening measure: it does not distinguish fat, muscle, bone, or fluid. Compare the separate adult BMI calculator using centimetres and kilograms and discuss meaningful targets with a clinician.
Frequently asked questions
Which formula is most accurate?
No equation is most accurate for every person or purpose. The result should be interpreted according to the clinical task, not treated as a universal goal.
Do these formulas account for age or muscle?
No. They use height and a sex-specific equation only. They do not measure muscle, fat distribution, frame, pregnancy, illness, or functional health.
Can I use the result for medication dosing?
Not without professional direction. Medication protocols may require ideal, adjusted, lean, or actual body weight depending on the drug and patient.