Ideal Weight Calculator
Compare multiple medical formulas to estimate ideal weight. Use the results to guide nutrition decisions, clinical dosing, or healthy goal setting.
Inputs
Provide height and sex. The calculator converts units automatically.
Ideal Weight Estimates
Devine formula
56.9 kg (125.5 lb)
Commonly used for medication dosing and clinical reference.
Robinson formula
57.4 kg (126.6 lb)
Adjusts increments slightly compared to Devine.
Miller formula
59.8 kg (131.9 lb)
Frequently used in research settings.
Hamwi formula
56.4 kg (124.4 lb)
Classic nutrition guideline often cited in dietetics.
Healthy BMI range (18.5–24.9)
50.4 – 67.8 kg (111 – 149.5 lb)
How to Use This Calculator
Measure height accurately
Use a stadiometer against a wall. Remove shoes, stand tall, and look forward for a precise reading.
Review multiple formulas
Each equation assumes different body frames. Compare results, then choose the estimate aligned with your medical guidance.
Apply in context
Ideal weight ranges support dosing calculations, nutrition planning, or health goals. Combine with waist measurements and lab results.
Formula
- Devine: Base weight + 2.3 kg × (inches over 60). Base = 50 kg (male), 45.5 kg (female).
- Robinson: Base weight + increment × (inches over 60). Base = 52 kg (male), 49 kg (female).
- Miller: Base weight + increment × (inches over 60). Base = 56.2 kg (male), 53.1 kg (female).
- Hamwi: Base weight + increment × (inches over 60). Base = 48 kg (male), 45.5 kg (female).
Formulas were designed for adults and assume a medium frame. Adjustments may be needed for petite or large frames.
Understanding Ideal Weight
Ideal weight formulas provide a reference for health professionals when adjusting medication doses, assessing nutritional status, or setting goals. They do not account for body composition, muscle mass, or fat distribution.
Pair ideal weight with waist-to-height ratio, body fat percentage, and metabolic indicators for a comprehensive evaluation. Personalized advice from a clinician or dietitian is best when making major changes.
Frequently Asked Questions
Why do formulas disagree?
Each formula was derived from different populations and assumptions about frame size. Use them as reference points rather than absolutes.
Should athletes use ideal weight?
Athletes with high muscle mass may exceed typical ideal weights. Focus on performance markers and body composition instead.
Can I use this for dosing medications?
Yes, many clinicians reference Devine or adjusted body weight for dosing. Always follow institutional protocols.
How often should I reassess?
Height is stable in adults, so reassessing is only needed if you change methodologies or require updated clinical data.