Estimates ideal body weight in kilograms from sex and height using the Devine formula.
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Disclaimer: General formula only. Not medical advice. Dosing decisions belong to a licensed clinician and the product's label.
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Inputs
sex (string, required) one of: male, female : Biological sex used by the equation
height (number, cm or in, required) min 0 : Height
height_unit (string, required) one of: cm, in : Unit of the height value
Outputs
ideal_body_weight_kg (kg): Estimated ideal body weight
Steps
Convert height to inches: in = cm / 2.54 if given in centimeters.
The Devine formula is defined for height at or above 60 inches (5 feet); heights below that use 60 inches as the base per the original formula's construction.
in_to_cm = 2.54 cm per in (source: Exact inch to centimeter conversion factor)
male_base_kg = 50 kg (source: Original publication of the Devine ideal body weight formula)
female_base_kg = 45.5 kg (source: Original publication of the Devine ideal body weight formula)
per_inch_over_five_feet = 2.3 kg per in (source: Original publication of the Devine ideal body weight formula)
base_height_in = 60 in (source: Original publication of the Devine ideal body weight formula)
Sources
Original publication of the Devine ideal body weight formula (Drug Intelligence and Clinical Pharmacy, 2026-09-30T19:15:00Z) - Source of the 50/45.5 base and 2.3 kg per inch coefficients.
Exact inch to centimeter conversion factor (NIST Handbook 44, Appendix C, 2026-09-30T19:15:00Z) - Defines 1 in = 2.54 cm exactly.