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Ideal Weight Calculator

Enter your height to compare four widely used ideal body weight formulas with the healthy BMI weight range.

Sex
Height in
ft
in
Show weights in

Ideal weight (average of 4 formulas)

70.2 kg

Healthy BMI range: 56.8 kg – 76.5 kg

Robinson (1983)
69.1 kg
Miller (1983)
68.9 kg
Devine (1974)
70.7 kg
Hamwi (1964)
72.3 kg

Step-by-step solution

Worked out with your numbers. Change any value above and the steps update.

  1. 1

    Height in inches over 5 feet

    175.3 cm ÷ 2.54 − 60 = 9

  2. 2

    Robinson (1983): 52 kg + 1.9 kg per inch

    52 + 1.9 × 9 = 69.1 kg

  3. 3

    Miller (1983): 56.2 kg + 1.41 kg per inch

    56.2 + 1.41 × 9 = 68.9 kg

  4. 4

    Devine (1974): 50 kg + 2.3 kg per inch

    50 + 2.3 × 9 = 70.7 kg

  5. 5

    Hamwi (1964): 48 kg + 2.7 kg per inch

    48 + 2.7 × 9 = 72.3 kg

  6. 6

    Average of the four formulas

    69.1 + 68.9 + 70.7 + 72.3 ÷ 4 = 70.2 kg

How it works

  • Each formula starts from a base weight at 5 ft (152.4 cm) and adds a set amount per inch above that.
  • Robinson: men 52 kg + 1.9 kg/in, women 49 kg + 1.7 kg/in. Miller: men 56.2 + 1.41, women 53.1 + 1.36.
  • Devine: men 50 + 2.3, women 45.5 + 2.3. Hamwi: men 48 + 2.7, women 45.5 + 2.2.
  • The healthy range is the weight that gives a BMI of 18.5 to 24.9 at your height.

Worked examples

Man, 5 ft 10 in

What is the ideal weight for a man 5 ft 10 in tall?

  1. He is 10 inches over 5 ft.
  2. Robinson 52 + 1.9 × 10 = 71 kg; Miller 70.3; Devine 73; Hamwi 75.
  3. Average of the four.

Answer: About 72.3 kg (range 70.3–75 kg across the formulas)

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Woman, 165 cm, in stone

What is the ideal weight in stone for a woman 165 cm tall?

  1. 165 cm ÷ 2.54 = 64.96 in, so 4.96 inches over 5 ft.
  2. Robinson 57.4 kg, Miller 59.8, Devine 56.9, Hamwi 56.4; average 57.7 kg.
  3. 57.7 kg = 127 lb = 9 st 1 lb.

Answer: About 9 st 1 lb (healthy BMI range 7 st 13 lb – 10 st 9 lb)

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Frequently asked questions

Why do the formulas disagree?

They were developed by different researchers, some originally to dose medicines rather than to set weight goals. That is why the calculator shows all four and the BMI range together.

Do these formulas account for muscle?

No. They only use height and sex, so muscular people may be healthy above these numbers.

Results are estimates for general information and are not financial, medical or professional advice.