Free Clinical Tool
Ideal Body Weight Calculator
Estimate ideal body weight using four validated clinical formulas. Compare results from Devine, Robinson, Miller, and Hamwi methods side by side.
Ideal Body Weight (IBW) formulas provide estimated weight ranges based on height and sex. Originally developed for pharmaceutical dosing calculations, these formulas are now widely used in clinical settings for nutritional assessment, rehabilitation goal-setting, and treatment planning. Different formulas produce slightly different results — this calculator shows all four major formulas simultaneously so practitioners can compare and choose the most appropriate reference for their patient population. Physical therapists use IBW for rehabilitation benchmarks, health coaches for goal-setting discussions, and naturopaths for nutritional planning.
Minimum height: 5 ft 0 in (formulas require at least 60 inches)
How to Use This Calculator
Select the patient's sex and enter their height in either feet/inches or centimeters. The calculator displays ideal body weight estimates from all four formulas simultaneously, allowing you to compare results and choose the most relevant benchmark for your clinical context.
Formula & Method
Devine (1974): Male = 50 + 2.3 × (height in inches − 60); Female = 45.5 + 2.3 × (height in inches − 60). Robinson (1983): Male = 52 + 1.9 × (height in inches − 60); Female = 49 + 1.7 × (height in inches − 60). Miller (1983): Male = 56.2 + 1.41 × (height in inches − 60); Female = 53.1 + 1.36 × (height in inches − 60). Hamwi (1964): Male = 48 + 2.7 × (height in inches − 60); Female = 45.5 + 2.2 × (height in inches − 60). All results are in kilograms.
Disclaimer
Ideal body weight formulas were originally designed for drug dosing, not as health targets. They do not account for body composition, ethnicity, age, or individual health factors. Use as one data point among many in clinical assessment.
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