Use this weight calculator and your gender weight and height to discover where you stand in the BMI range within four main body mass index formulas. Below the calculation you can find everything there is to know about these weight equations and how they can be used in real life.

Age: *
Gender: *
Weight: *
Height: *
Age: *
Gender: *
Weight: *
Height: *

How does the weight calculator work?

The above weight tool is set to determine the ideal weight one person should have according to their height. The data required to input is the age in years, gender, weight and height. There are two methods of input offered, one in metric and the other one in English for which units feel more comfortable, lbs and feet inches or kg and centimeters.

The form then uses your data in 5 different calculations to determine the ideal weight, through formulas that were released years ago by scientists such as J.D. Robinson and D.R. Miller in 1983, B.J. Devine in 1974, G.J. Hamwi in 1964 and by the Healthy BMI range recommendation made by the World Health Organization (WHO).

Weight formulas:

These are the four formulas that are used, beside the basic BMI to assess the ideal body weight in comparison to the height and gender of the subject.

1983: D. R. Miller’s formula

- IBW for women=53.1 kg + 1.36 kg per inch over 5 feet

- IBW for men= 56.2 kg + 1.41 kg per inch over 5 feet

1983: J.D. Robinson’s formula

- IBW for women= 49 kg + 1.7 kg per inch over 5 feet

- IBW for men= 52 kg + 1.9 kg per inch over 5 feet

1974: B. J. Devine’s formula

- IBW for women = 45.5 kg + 2.3 kg per inch over 5 feet

- IBW for men= 50.0 kg+ 2.3 kg per inch over 5 feet

1964: G. J. Hamwi’s formula

- IBW for women = 45.5 kg + 2.2 kg per inch over 5 feet

- IBW for men= 48.0 kg + 2.7 kg per inch over 5 feet

Example of a weight calculation:

Let’s take for example the case of 30 years old male weighing 190 lbs at a height of 6 feet and 2 inches. The results conveyed by the form above are:

  • Your BMI is 24.4;
  • Your BMI category is: Healthy weight - Highest Normal;
  • By using Miller’s formula (1983), your ideal weight is 167.4 lbs;
  • By using Robinson’s formula (1983), your ideal weight is 173.3 lbs;
  • By using Devine’s formula (1974), your ideal weight is 181.2 lbs;
  • By using Hamwi’s formula (1964), your ideal weight is 189.2 lbs;
  • Your recommended weight, based on the healthy BMI recommendation is between 144.1 lbs and 194.7 lbs.

Interpreting the results

This type of weight calculator uses the Healthy BMI range recommendation released by the World Health Organization (WHO) 1995, 2000 and 2004 that says for both men and women, the recommended BMI range should be between 18 and 25. For the other results, each formula gives a certain weight value that is considered to be the healthiest given the gender and height conditions.

Why is important to know where your weight stands?

Healthy weight is a level of the body’s weight we all refer to as being the most appropriate and to benefit most the body. There is no 100% accurate formula to estimate ideal body weight, but the results that the existing formulas provide are approximate and can offer a quick look on body shape. Our weight doesn’t have only aesthetic implication but can also show the risks we carry to develop certain health problems, such as cardiovascular diseases, in the case of overweight people.

Healthy weight maintaining tips

  • Keep things balanced: achieving and maintaining a healthy weight can mean keeping balance between the calories in and the calories out;
  • Proper sports activity levels might help some people achieve and maintain healthy weight, because when making sports activities calorie get burned;
  • No fast food, say yes to slow food;
  • Stay away from stress.


1) Devine BJ. Gentamicin therapy. Drug Intell Clin Pharm. 1974;8:650–655.

2) Pai MP, Paloucek FP. (2000) The origin of the ideal body weight equations. Ann Pharmacother; 34(9):1066-9.

3) Walpole SC, Prieto-Merino D, Edwards P, Cleland J,  Stevens G, Roberts I et al. (2012) The weight of nations: an estimation of adult human biomass. BMC Public Health, 12:439

04 Dec, 2014