Ideal Body Weight Calculator
Compare your ideal weight range across four medical formulas.
Height
Ideal Body Weight
65.9 kg
Healthy Range
65.2 – 66.7 kg
By formula
Devine (1974)
65.9 kg
Robinson (1983)
65.2 kg
Miller (1983)
66.0 kg
Hamwi (1964)
66.7 kg
These formulas were originally developed for medication dosing, not fitness goals — treat the range as a general reference point, not a strict target.
How this calculator works
Devine (1974), Robinson (1983), Miller (1983) and Hamwi (1964) each estimate a baseline weight for a given height, then adjust it slightly by gender — all four start from a base weight for 5 feet of height and add a fixed amount per extra inch. They were designed by doctors to standardize drug dosing calculations (many medications are dosed by body weight), which is why they don't account for frame size, muscle mass or ethnicity.
Why four different formulas?
Each was developed independently, in different decades, from different clinical reference populations. Devine's formula is the most widely used today, largely because it's the one most pharmacology dosing guidelines standardized on, but Robinson and Miller are generally considered refinements of it, while Hamwi (the oldest) tends to run higher than the other three. Because they use slightly different per-inch increments, they rarely agree exactly.
Why show a range instead of one number
Presenting all four side by side, rather than picking one as "correct," is more honest about how approximate these formulas really are — a spread of a few kilograms between them is normal and expected, not an error. Treat the average as a rough midpoint, not a precise target.
What these formulas don't account for
None of the four adjust for frame size, muscle mass, or ethnicity, and all were derived primarily from adult populations of a specific era and region — they don't generalize perfectly to everyone. A muscular or large-framed person will read as "overweight" by these formulas despite being perfectly healthy. For a body-composition-based alternative, see the Body Fat Percentage Calculator, or the BMI Calculator for the more commonly used population screening metric.
Frequently Asked Questions
Which formulas does this calculator use?
It calculates your ideal weight using four established medical formulas — Devine, Robinson, Miller and Hamwi — and shows the range and average across all four, since no single formula is universally agreed upon.
Why do the four formulas give different results?
Each was developed from different reference populations and decades of medical research, so they weight height and frame differently. Showing all four as a range is more honest than presenting one number as definitive.
Is ideal body weight the same as a healthy weight?
Not exactly — these formulas were originally developed for medical dosing calculations, not fitness goals. They're a reasonable reference point, but a healthy weight range depends on frame size, muscle mass and individual health factors too.
Which of the four formulas is most commonly used?
Devine's formula (1974) is generally the most widely referenced today, largely because it's the one most clinical drug-dosing guidelines standardized on. Robinson and Miller are often considered later refinements of it, while Hamwi, the oldest of the four, tends to estimate slightly higher.
Why don't these formulas account for muscle mass?
They were built to standardize medication dosing by height, not to assess fitness or body composition — so a muscular or large-framed person will often read as 'overweight' by these formulas despite being perfectly healthy. The Body Fat Percentage Calculator is a better fit if body composition is what you care about.
This tool provides general estimates for informational purposes only and isn't a substitute for professional medical advice. Consult a doctor or qualified healthcare provider before making decisions about your health.