Calculate and compare your estimated Ideal Body Weight (IBW) using four classic anthropometric formulas—Devine, Robinson, Miller, and Hamwi. Enter your height in centimeters or feet and inches to view instant reference estimates in both kilograms (kg) and pounds (lb).
How to Read These Estimates: Classic Ideal Body Weight formulas provide height-based anthropometric approximations that naturally differ from one another due to different historical reference datasets. A single figure is not a mandatory target weight; frame size, lean muscle mass, bone density, age, and clinical history must always be considered.
Awaiting Valid Height Input
Please enter a valid height between 120 cm and 250 cm (3 ft 11.2 in to 8 ft 2.4 in) to calculate and compare your Ideal Body Weight estimates.
Anthropometric Science & Methodology
Understanding the Ideal Body Weight Calculator & Formulas
What Is Ideal Body Weight?
Ideal Body Weight (IBW) is a historical clinical and anthropometric reference metric originally developed to estimate a baseline weight proportional to an adult individual's standing height. Introduced in the mid-to-late 20th century, IBW equations were designed for clinical research, nutritional screening, and pharmacokinetic modeling rather than aesthetic goals.
Because human body composition varies significantly due to skeletal frame dimensions, skeletal muscle mass, bone mineral density, and age, an Ideal Body Weight estimate is best understood as a standardized reference point rather than a universal definition of optimal health.
How Is Ideal Body Weight Calculated?
Classic Ideal Body Weight equations use a linear mathematical model anchored at a baseline height of 5 feet (60 inches or 152.4 cm). First, standing height in centimeters is converted to exact decimal inches using heightInches = heightCm / 2.54. Next, the signed difference from 60 inches is determined via inchesFrom60 = heightInches - 60.
Each formula applies a baseline weight constant (in kilograms) at 60 inches and adds (or subtracts, for heights below 60 inches) a fixed increment per inch. Results in kilograms are converted to pounds using the exact factor 1 kg = 2.2046226218 lb.
Formula Name
Male Formula
Female Formula
Measurement Unit
Brief Explanation
Devine Formula (1974)
50 + (2.3 × inchesFrom60)
45.5 + (2.3 × inchesFrom60)
Kilograms (kg)
Published by Dr. Ben J. Devine in 1974; the most widely referenced anthropometric equation in clinical literature.
Robinson Formula (1983)
52 + (1.9 × inchesFrom60)
49 + (1.7 × inchesFrom60)
Kilograms (kg)
Developed by J.D. Robinson et al. to refine height-weight regression slopes using updated actuarial data.
Miller Formula (1983)
56.2 + (1.41 × inchesFrom60)
53.1 + (1.36 × inchesFrom60)
Kilograms (kg)
Derived by D.R. Miller et al. from 1983 Metropolitan Life Insurance tables; yields higher baseline values at shorter heights.
Hamwi Formula (1964)
48 + (2.7 × inchesFrom60)
45.5 + (2.2 × inchesFrom60)
Kilograms (kg)
Introduced by Dr. G.J. Hamwi for rapid dietetic and nutritional reference estimation in clinical settings.
Step-by-Step Instructions
How to Use the Calculator
1
Enter Your Height
Input your standing height into the height field. Ensure the value falls within the supported adult range of 120 cm to 250 cm (3 ft 11.2 in to 8 ft 2.4 in).
2
Select Measurement Units
Choose between Centimeters (cm) or Feet and Inches (ft/in). Switching units automatically converts your entered height without loss of accuracy.
3
Choose Formula Basis
Select either the Male formula basis or Female formula basis to apply the corresponding baseline constant used by the classic equations.
4
Pick a Preferred Formula
Select Devine, Robinson, Miller, or Hamwi as your primary equation. The calculator updates automatically or when you click Calculate Ideal Body Weight.
5
Read Your Results
View your primary estimate in both kilograms (kg) and pounds (lb), toggle which unit appears first, and inspect the exact mathematical step-by-step substitution.
6
Compare All Four Formulas
Review the side-by-side comparison cards and the 4-formula minimum-to-maximum range to understand how different clinical equations estimate weight for your height.
Verified Mathematical Walkthroughs
Independent Calculation Examples
Example A: Height 175 cm (Male Formula Basis)
Height in Inches (175 / 2.54):68.8976 in
Inches from 60 (68.8976 - 60):+8.8976 in
Devine:50 + (2.3 × 8.8976)70.5 kg (155.3 lb)
Robinson:52 + (1.9 × 8.8976)68.9 kg (151.9 lb)
Miller:56.2 + (1.41 × 8.8976)68.7 kg (151.6 lb)
Hamwi:48 + (2.7 × 8.8976)72.0 kg (158.8 lb)
Example B: Height 5 ft 6 in / 167.64 cm (Female Formula Basis)
Height in Inches (5 × 12 + 6):66.0000 in
Inches from 60 (66 - 60):+6.0000 in
Devine:45.5 + (2.3 × 6)59.3 kg (130.7 lb)
Robinson:49 + (1.7 × 6)59.2 kg (130.5 lb)
Miller:53.1 + (1.36 × 6)61.3 kg (135.1 lb)
Hamwi:45.5 + (2.2 × 6)58.7 kg (129.4 lb)
Medical Disclaimer & Clinical Limitations
This calculator provides estimates based on traditional Ideal Body Weight formulas and is intended for educational and informational purposes only. Results are not a diagnosis, a personalized treatment recommendation, or a substitute for professional medical judgment. Ideal body weight estimates do not determine an individual's overall health, nutritional status, or appropriate medication dose. Consult a qualified healthcare professional for individual medical decisions.
Common Questions
Frequently Asked Questions (FAQ)
An Ideal Body Weight Calculator is an educational anthropometric tool that computes height-based weight reference estimates using established equations from medical literature—specifically the Devine, Robinson, Miller, and Hamwi formulas. It allows users to compare how these classic formulas estimate reference weight in both kilograms and pounds.
Classic Ideal Body Weight formulas start with a base weight assigned to a height of 5 feet (60 inches or 152.4 cm) for a selected formula basis (Male or Female). They then add or subtract a specific number of kilograms for every inch above or below 60 inches (inchesFrom60 = (heightCm / 2.54) - 60).
Published by Dr. Ben J. Devine in 1974, the Devine formula is the most widely cited equation for estimating Ideal Body Weight in clinical literature. It calculates 50 + 2.3 × (height in inches - 60) kg for the male formula basis and 45.5 + 2.3 × (height in inches - 60) kg for the female formula basis.
Each formula uses a slightly different base weight at 60 inches and a different per-inch slope. Hamwi (1964) has the steepest slope for males (+2.7 kg/in), Devine (1974) uses +2.3 kg/in for both bases, Robinson (1983) uses moderate slopes (+1.9 and +1.7 kg/in), and Miller (1983) starts with a higher base weight at 60 inches but uses a gentler slope (+1.41 and +1.36 kg/in).
Yes. Our Ideal Body Weight Calculator automatically computes results in kilograms (kg) and converts them into pounds (lb) using the exact international conversion factor (1 kg = 2.2046226218 lb). You can also toggle the primary display to show pounds first.
To convert centimeters to inches, divide the centimeter value by 2.54. To express total inches in feet and inches, divide total inches by 12: the whole number quotient is feet, and the remainder is inches. Our calculator performs this conversion automatically whenever you switch units.
No. "Ideal Body Weight" is a technical name for height-based statistical equations and does not define a universally healthy weight for an individual. Healthy weight depends on muscle mass, body fat distribution, bone density, metabolic markers, age, and medical history—none of which are captured by height alone.
No. The classic Devine, Robinson, Miller, and Hamwi equations were developed for adults and should not be applied directly to children or adolescents. Pediatric growth assessment requires age- and sex-specific growth velocity charts and clinical evaluation by a pediatrician.
No. Do not use this calculator to determine medication dosages. While clinicians and pharmacists sometimes reference IBW, total body weight, or adjusted body weight under strict clinical protocols, medication dosing requires professional evaluation of renal function, hepatic function, therapeutic index, and patient-specific clinical factors.
Yes. If you have questions about your weight, body composition, nutrition, or metabolic health, always consult a physician, registered dietitian, or qualified healthcare provider who can evaluate your complete health profile.
Explore Related Anthropometric Topics & Search Keywords50 SEO Tags (Click to Expand)
Ideal Body Weight CalculatorIBW CalculatorCalculate Ideal Body WeightIdeal Body Weight FormulaDevine Formula CalculatorRobinson Formula CalculatorMiller Formula CalculatorHamwi Formula CalculatorMale Ideal Body Weight FormulaFemale Ideal Body Weight FormulaHeight Based Weight EstimatorIdeal Body Weight in KilogramsIdeal Body Weight in PoundsAnthropometric Weight CalculatorIBW Equations ComparisonMetric Ideal Body Weight CalculatorImperial Ideal Body Weight CalculatorCentimeters to Ideal Body WeightFeet and Inches IBW CalculatorDevine 1974 IBW EquationRobinson 1983 IBW EquationMiller 1983 IBW EquationHamwi 1964 IBW EquationAdult Ideal Body Weight ReferenceClinical IBW Estimation ToolHeight to Weight Reference ChartKilograms to Pounds IBW ConverterPounds to Kilograms IBW ConverterCentimeters to Feet and Inches Height60 Inches Baseline Weight FormulaHeight Above 5 Feet IBW CalculationStandard Ideal Body Weight EquationsNutritional Assessment Weight ReferenceDevine vs Robinson IBW ComparisonMiller vs Hamwi IBW ComparisonFour Formula Ideal Weight CalculatorEstimated Reference Body WeightStanding Height Weight EstimationOnline Ideal Body Weight ToolFree Ideal Body Weight CalculatorInstant IBW Range EstimatorAnthropometric Reference EquationsIdeal Weight by Height in CMIdeal Weight by Height in Feet InchesBrowser Based IBW CalculatorClassic Medical Weight FormulasHeight Proportional Weight EstimateIBW Kilogram Pound Dual DisplayAdult Stature Weight CalculatorTraditional Ideal Body Weight Equations