Find your healthy weight range using multiple clinical formulas
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Ideal body weight — Quick answer
Ideal Body Weight (IBW) is a target weight based on height and gender. Several historical formulas exist (Devine, Robinson, Miller, Hamwi) — used in clinical dosing and aviation.
Devine (M): IBW = 50 + 2.3 × (height_in − 60) Devine (F): IBW = 45.5 + 2.3 × (height_in − 60) Robinson, Miller, Hamwi: similar slope, different intercepts
height_in — height in inches above 60 in (5 ft); convert: cm/2.54
IBW — ideal body weight in kg
Worked example: Male, 175 cm (68.9 in). Devine: IBW = 50 + 2.3 × (68.9 − 60) = 50 + 2.3 × 8.9 = 70.5 kg. Robinson: 52 + 1.9 × 8.9 = 68.9 kg. Miller: 56.2 + 1.41 × 8.9 = 68.8 kg.
IBW by height (4 formulas, average)
Height
Male (kg)
Female (kg)
150 cm / 4'11″
47.0
42.5
160 cm / 5'3″
54.5
50.0
170 cm / 5'7″
65.0
60.5
175 cm / 5'9″
70.5
66.0
180 cm / 5'11″
76.0
71.5
185 cm / 6'1″
81.5
77.0
190 cm / 6'3″
87.0
82.5
Standard / source: Devine BJ (1974); Robinson JD (1983); Miller DR (1983); Hamwi GJ (1964); used in ARDS ventilator settings, drug dosing.
Used for: Clinical drug dosing (especially anaesthesia & ICU), ventilator tidal-volume settings (6 mL/kg IBW for ARDS), pilot weight allowances, weight-management baselines.
⚖️ Ideal Weight Calculator
Formula
This calculator uses the standard ideal weight calculator formula:
Devine Formula (men)
IBW = 50 + 2.3 × (height in inches − 60)
Frequently Asked Questions
How is ideal weight calculated?⌄
Ideal weight is calculated using formulas like Devine (50 kg + 2.3 kg per inch over 5 feet for men) or Hamwi. Different formulas give slightly different results.
Is there one universal ideal weight formula?⌄
No. Devine, Robinson, Miller, and Hamwi formulas each produce slightly different results. The range between them is considered a healthy target zone.
What is a healthy weight for 5ft 8in male?⌄
Using the Devine formula: 50 + 2.3 × 8 = 68.4 kg. Most formulas suggest 68–75 kg for a 5 ft 8 in (173 cm) male.
Does ideal weight account for muscle mass?⌄
Traditional ideal weight formulas do not account for body composition. Muscular individuals may weigh more than formula values while still being healthy.
How does ideal weight differ from BMI?⌄
BMI is a ratio of weight to height squared used to categorise body weight. Ideal weight formulas provide a target weight for a given height.
Can I use this for children?⌄
These formulas are designed for adults. Paediatric growth charts (CDC or WHO) should be used for children and adolescents.
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Devine (1974) · Robinson (1983) · Miller (1983) · Hamwi (1964)
Clauses applied
Published ideal-body-weight formulae. Devine was created for drug dosing, not as a health target.
Core formula
Devine (men): 50.0 kg + 2.3 kg per inch over 5 ft · (women): 45.5 kg + 2.3 kg per inch
Why this matters
These formulae were derived for pharmacological dosing, not as a definition of a healthy weight. They ignore frame size, muscle mass and body composition entirely. Do not treat the output as a goal. This is general information, not medical advice — discuss any health decision with a qualified clinician.
Independently verified
12 July 2026 — Re-derived from the governing standard and checked numerically against worked reference cases from the standard itself — not merely tested for “returns a number”.
Results are for guidance. Verify against the current edition of the governing standard and have a qualified professional review before use in practice.