Ideal Weight Calculator

Written byOleh Soloninupdated 27 September 2026

Sex

Height, cm

Result

Healthy weight for your height

56.7–76.5 kg

Devine formula, kg70.5
Robinson formula, kg68.9
Miller formula, kg68.7
Hamwi formula, kg72
Spread between formulas, kg3.3

This result is informational only and is not professional advice.

Historical formulas, shown side by side

Compare the Devine, Robinson, Miller and Hamwi estimates for your height. The spread between them is the real lesson.

These equations were built for clinical work: Devine's 1974 formula was meant for drug dosing, not for telling anyone what they ought to weigh.

Showing all four at once is deliberate. Between 165 and 175 cm they agree within 1.5 to 3.5 kg, but they drift apart for tall and short people: for a 190 cm man the spread is almost 11 kg. There is no single ideal weight.

How to use

Choose your sex.
Enter your height in centimetres.
The result gives the Devine, Robinson, Miller and Hamwi weights and the spread between them.
Set them against the healthy BMI range for your height — it is wider, and more useful than any one formula.

Four formulas for men

The formulas meet around 170 cm, where the spread is a kilogram and a half, and fan out towards the edges: Hamwi adds the most per inch and Miller the least, so at 190 cm they are almost 11 kg apart.

Every row comes from the calculator on this page, weights in kilograms.
Height, cm	Devine	Robinson	Miller	Hamwi	Spread	Healthy BMI, kg
160	56.9	57.7	60.4	56.1	4.3	47.4–63.9
165	61.4	61.4	63.2	61.4	1.8	50.4–68
170	65.9	65.2	66	66.7	1.5	53.5–72.2
175	70.5	68.9	68.7	72	3.3	56.7–76.5
180	75	72.6	71.5	77.3	5.8	60–80.9
185	79.5	76.4	74.3	82.7	8.4	63.4–85.5
190	84	80.1	77.1	88	10.9	66.8–90.2

Four formulas for women

For women the formulas meet around 170 to 175 cm. For shorter women Miller is the outlier: at 155 cm it gives 54.5 kg, while Devine and Hamwi give about 48.

Every row comes from the calculator on this page, weights in kilograms.
Height, cm	Devine	Robinson	Miller	Hamwi	Spread	Healthy BMI, kg
155	47.9	50.7	54.5	47.8	6.7	44.5–60
160	52.4	54.1	57.2	52.1	5.1	47.4–63.9
165	56.9	57.4	59.8	56.4	3.4	50.4–68
170	61.4	60.8	62.5	60.7	1.8	53.5–72.2
175	66	64.1	65.2	65.1	1.9	56.7–76.5
180	70.5	67.5	67.9	69.4	3	60–80.9

What this calculator shows

Weights by the Devine, Robinson, Miller and Hamwi formulas
The spread between the formulas in kilograms
The healthy weight range for your height — a BMI from 18.5 up to, but not including, 25

What to keep in mind

All four formulas share one shape: a base weight at five feet (152.4 cm) plus a fixed number of kilograms for every inch above it. Only the coefficients differ.
The formulas are used here without a frame-size adjustment — Hamwi's original had one, ±10% — and none of them assesses muscle mass or body composition.

FAQs

Which formula should I trust?

None, individually. They were designed for clinical estimation, not personal goal-setting. The healthy BMI range is a better guide, and body composition better still.

Why do the four disagree?

Each was fitted to its own sample and era: Hamwi in 1964, Devine in 1974, Robinson and Miller in 1983. All start from a weight at 152.4 cm and add a different amount per inch, so they drift apart the further a height is from the middle.

What is the ideal weight for 170 cm?

For a man the formulas give 65.2 to 66.7 kg, for a woman 60.7 to 62.5 kg. A healthy BMI at that height runs from 53.5 to 72.2 kg.

Does frame size matter?

Yes, though the calculator applies the formulas without it. Hamwi's original method added 10 percent for a large frame and took 10 percent off for a small one.

Should athletes use this?

No. The formulas know nothing about body composition, and a muscular person can sit above all of them while being perfectly healthy.

How is ideal weight different from a healthy BMI?

A formula gives a point; BMI gives a band. For a man of 180 cm the formulas say 71.5–77.3 kg, while a healthy BMI allows 60–80.9 kg — a span of over twenty kilograms.

Worked example

A man of 180 cm

Input: a man, height 180 cm

Output: 71.5 to 77.3 kg across the four formulas

Note: Devine gives 75 kg, Robinson 72.6, Miller 71.5 and Hamwi 77.3. A healthy BMI at the same height covers 60–80.9 kg: the 'ideal' is a wide band, not a point.

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