Use this free online ideal body weight calculator to estimate a healthy target weight based on your gender and height, using the Devine formula. Enter your gender and height in centimeters to get an instant estimate of your ideal body weight in kilograms. This tool is intended for general informational purposes only and does not replace professional medical advice.
How to Use the Ideal Body Weight Calculator
Select your Gender from the dropdown.
Enter your Height (cm) in the height field.
Click "Calculate Ideal Weight" to view your estimated ideal body weight.
About the Devine Formula
The Devine formula was published in 1974, originally to help doctors work out medicine doses, and it is still used in hospitals for that purpose. It starts from a base weight for a person exactly 5 feet (60 inches) tall and adds 2.3 kg for every inch above that:
Men: 50 kg + 2.3 kg × (height in inches − 60)
Women: 45.5 kg + 2.3 kg × (height in inches − 60)
The calculator converts your height from centimetres to inches by dividing by 2.54, so you do not need to convert it yourself.
Worked Examples
A man who is 170 cm tall: 170 ÷ 2.54 = 66.93 inches. That is 6.93 inches above 5 feet, and 6.93 × 2.3 = 15.94 kg. Adding the 50 kg base gives an ideal body weight of 65.94 kg.
A woman who is 160 cm tall: 160 ÷ 2.54 = 62.99 inches, which is 2.99 inches above 5 feet. 2.99 × 2.3 = 6.88 kg, plus the 45.5 kg base, gives 52.38 kg.
Results from this calculator at common heights:
Height
Men
Women
152 cm (5 ft 0 in)
49.64 kg
45.14 kg
155 cm
52.35 kg
47.85 kg
160 cm
56.88 kg
52.38 kg
165 cm
61.41 kg
56.91 kg
170 cm
65.94 kg
61.44 kg
175 cm
70.46 kg
65.96 kg
180 cm
74.99 kg
70.49 kg
185 cm
79.52 kg
75.02 kg
How Other Formulas Compare
Devine is not the only ideal weight formula. Robinson (1983), Miller (1983) and Hamwi (1964) use the same idea of a base weight at 5 feet plus a fixed amount per inch, but with different numbers. For the same two people:
Formula
Man, 170 cm
Woman, 160 cm
Devine (this tool)
65.9 kg
52.4 kg
Robinson
65.2 kg
54.1 kg
Miller
66.0 kg
57.2 kg
Hamwi
66.7 kg
52.1 kg
The spread of several kilograms is a reminder that there is no single correct ideal weight. A more useful way to read the result is as the middle of a healthy range rather than a number you must hit exactly.
Interpreting Your Result
Being a few kilograms above or below the figure is not a problem in itself. Frame size and muscle mass vary: someone who does regular strength training may sit well above it while being lean.
The formula only uses height and sex. It ignores age, body composition and where fat is carried, so check it against your BMI and waist measurement for a fuller picture.
For adults under about 152 cm, which includes many Indian women, the formula extrapolates below its base height and tends to give low numbers. A BMI-based healthy range is often a better guide at these heights.
It is designed for adults. It should not be used for children, teenagers who are still growing, or during pregnancy.
This estimate is for general information only. If you are planning to lose or gain a significant amount of weight, discuss a realistic target with your doctor.
Frequently Asked Questions
This calculator uses the Devine formula. For men: Ideal Weight = 50 + 2.3 × (height in inches - 60). For women: Ideal Weight = 45.5 + 2.3 × (height in inches - 60). Your height in centimeters is automatically converted to inches before the calculation.
The Devine formula was designed for adults roughly 5 feet (152 cm) tall or taller. Below that height, the formula can produce a zero or negative result, so the calculator shows "N/A" along with a note explaining that the result isn't meaningful at that height.
Ideal body weight gives one number for your height and sex. A healthy BMI range gives a span of weights. For a 170 cm adult, a BMI of 18.5 – 24.9 corresponds to about 53.5 – 72 kg, and the Devine result for a man of that height, 65.94 kg, falls inside it. Both are rough guides, not targets you must reach exactly.
On average, men carry more muscle and have heavier bones than women of the same height. The Devine formula reflects this with a base of 50 kg for men and 45.5 kg for women, so at any height the male result is 4.5 kg higher.
No. The result is a general estimate based on height and gender only - it doesn't account for factors like muscle mass, bone structure, or body frame. It's for general informational purposes and should not replace personalized advice from a healthcare professional.