Ideal Weight Calculator
Compare ideal body weight estimates from four standard clinical formulas.
Formula and sources updated · Data sources · 1View algorithm, constants and default inputs (JSON)
About this calculator
There is no single ideal weight. Devine, Robinson, Miller and Hamwi are historical height-based estimates and can differ; the BMI 18.5–25 range is a screening reference, not an individual health target. Neither measure captures body composition or replaces clinical advice.
Worked example
calculated with the default values below
Sex Male · Height 178 cm Devine formula 73.2 kg · Robinson formula 71.1 kg · Miller formula 70.4 kg · Hamwi formula 75.2 kg · Weight at BMI 18.5 58.6 kg · Weight at BMI 25 79.2 kg
Method and assumptions
W = b + k × max(0, h ÷ 2.54 − 60) ; W_B ∈ [18.5 × (h ÷ 100)², 25 × (h ÷ 100)²] Devine b/k: F 45.5/2.3, M 50/2.3; Robinson F 49/1.7, M 52/1.9; Miller F 53.1/1.36, M 56.2/1.41; Hamwi F 45.5/2.2, M 48/2.7. There is no single ideal weight. Devine, Robinson, Miller and Hamwi are historical height-based estimates and can differ; the BMI 18.5–25 range is a screening reference, not an individual health target. Neither measure captures body composition or replaces clinical advice. The references provide context and limitations. They do not validate this page’s illustrative multipliers, lookup values or predictions.
Data sources
The references provide context and limitations. They do not validate this page’s illustrative multipliers, lookup values or predictions.
Disclaimer
These calculators are for general information only and are not a medical device, a diagnosis or a treatment plan. Reference ranges describe populations, not individuals, and do not account for pregnancy, medication, disability or athletic training. Discuss your own situation with a qualified healthcare professional.
Implementation source
This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.
Formula and variables
W = b + k × max(0, h ÷ 2.54 − 60) ; W_B ∈ [18.5 × (h ÷ 100)², 25 × (h ÷ 100)²]
- W
- ideal body weight (kg)
- b
- base constant at 5 ft
- k
- weight added per inch over 5 ft
- h
- height (cm)
- W_B
- healthy weight range for BMI 18.5–25 (kg)
Devine b/k: F 45.5/2.3, M 50/2.3; Robinson F 49/1.7, M 52/1.9; Miller F 53.1/1.36, M 56.2/1.41; Hamwi F 45.5/2.2, M 48/2.7.
Frequently asked questions
Are these estimates medical targets?
No. These historical formulas can disagree, and BMI is only a screening reference. Neither result accounts for body composition or individual health.
Which inputs and limits apply to Ideal Weight Calculator?
Use the units shown beside each field. These are form limits, not recommended settings. Height: 120–230 cm W = b + k × max(0, h ÷ 2.54 − 60) ; W_B ∈ [18.5 × (h ÷ 100)², 25 × (h ÷ 100)²] Devine b/k: F 45.5/2.3, M 50/2.3; Robinson F 49/1.7, M 52/1.9; Miller F 53.1/1.36, M 56.2/1.41; Hamwi F 45.5/2.2, M 48/2.7. There is no single ideal weight. Devine, Robinson, Miller and Hamwi are historical height-based estimates and can differ; the BMI 18.5–25 range is a screening reference, not an individual health target. Neither measure captures body composition or replaces clinical advice. The references provide context and limitations. They do not validate this page’s illustrative multipliers, lookup values or predictions.
What is a complete worked example for Sex = Male; Height = 178 cm?
Inputs: Sex = Male; Height = 178 cm. Calculation: W = b + k × max(0, h ÷ 2.54 − 60) ; W_B ∈ [18.5 × (h ÷ 100)², 25 × (h ÷ 100)²]. Results: Devine formula = 73.2 kg; Robinson formula = 71.1 kg; Miller formula = 70.4 kg; Hamwi formula = 75.2 kg; Weight at BMI 18.5 = 58.6 kg; Weight at BMI 25 = 79.2 kg.