Which formula does the calculator use?

We show results from four widely cited formulas: Devine, Robinson, Miller, and Hamwi. Each gives a slightly different estimate — 'ideal weight' isn't a precise medical concept, so seeing the range is more useful than a single number.

Is ideal weight the same as healthy weight?

No — ideal-weight formulas were originally designed for medication dosing, not general health. For a health-oriented target, use BMI (range 18.5–24.9) or a body-fat percentage in a healthy range.

Does age affect ideal weight?

The classic formulas don't factor in age. For adults, weight tends to naturally trend slightly higher with age without health concern — absolute targets that were calibrated in the 1970s may be over-restrictive.

No. It's a calculator. Any material weight-change goal should involve your doctor, especially if you have underlying conditions or are pregnant.

Health & Fitness · Free tool

Ideal Weight Calculator

Calculate your ideal weight using Devine, Robinson, and Miller formulas for honest, no-fad ranges. This free online tool provides instant results with no registration.

Updated June 2026

SexHeight (cm)

Devine

70.5 kg (155.3 lb)

Robinson

68.9 kg (151.9 lb)

Miller

68.7 kg (151.6 lb)

Hamwi

72.0 kg (158.8 lb)

Ideal weight formulas are estimates and don’t account for frame size or muscle mass. Use as a rough reference only.

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What it does

A free ideal weight calculator using the four standard formulas — Devine, Robinson, Miller, and Hamwi — so you can compare across them. Enter sex and height; get estimates in kg and lb.

Ideal weight formulas are rough guidelines. They don’t account for frame size, muscle mass, or body composition, so athletes often fall outside the range despite being in excellent health. Treat these as one reference point among several.

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Example input & output

Input

Female, 5'6" (168 cm)

Output

Devine: 59.0 kg (130 lb)
Robinson: 57.4 kg (127 lb)
Miller: 57.9 kg (128 lb)
Hamwi: 59.9 kg (132 lb)

The spread (127–132 lb) is more informative than any single number — 'ideal weight' inherently has a range.

How to use it

Pick your sex.
Enter your height in cm.
Compare results across the four formulas.
Use as rough reference, not as a strict target.

When to use this tool

Getting a rough weight range for a medication dose calculation (the original clinical purpose).
Comparing your current weight to a commonly cited reference point.
Setting a loose weight-loss or weight-gain goal to discuss with a clinician.
Sanity-checking a target weight another source recommends.

When not to use it

Pregnancy or postpartum recovery — work with your provider, not a decades-old formula.
Athletes with significant muscle mass — these formulas will mark you 'overweight' even at athletic body-fat %.
Eating-disorder recovery — any weight target should come from your treatment team.
Children or adolescents — use BMI percentiles, not adult formulas.

Frequently asked questions

Which formula does the calculator use?: We show results from four widely cited formulas: Devine, Robinson, Miller, and Hamwi. Each gives a slightly different estimate — 'ideal weight' isn't a precise medical concept, so seeing the range is more useful than a single number.
Is ideal weight the same as healthy weight?: No — ideal-weight formulas were originally designed for medication dosing, not general health. For a health-oriented target, use BMI (range 18.5–24.9) or a body-fat percentage in a healthy range.
Does age affect ideal weight?: The classic formulas don't factor in age. For adults, weight tends to naturally trend slightly higher with age without health concern — absolute targets that were calibrated in the 1970s may be over-restrictive.
Is this advice?: No. It's a calculator. Any material weight-change goal should involve your doctor, especially if you have underlying conditions or are pregnant.

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