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Ideal Weight Calculator

Created by Bogna Szyk, Rita Rain and Łucja Zaborowska, MD, PhD candidate
Reviewed by Jack Bowater
Based on research by
Pai MP, Paloucek FP. The origin of the "ideal" body weight equations; Annals of Pharmacotherapy; September 2000See 3 more sources
Shah B, Sucher K, Hollenbeck CB. Comparison of ideal body weight equations and published height-weight tables with body mass index tables for healthy adults in the United States.; Nutrition in Clinical Practice; June 2006Devine BJ. Gentamicin therapy. Drug Intelligence & Clinical Pharmacy; 1974Weber-Sanchez A, Velázquez Ortega S and Weber-Álvarez P Validation of the Broca index as the most practical method to calculate the ideal body weight; Journal of Clinical Investigations and Studies; Jan 2018
Last updated: Jan 30, 2024


If you are really concerned about your health or your looks and want to know how much you should weigh, this ideal weight calculator is the tool for you. It will help you determine your ideal body weight based on your height and sex. Read on to learn the different formulas for calculating your IBW (ideal body weight) and how to interpret the results. We will also explain how to use the healthy weight chart, which is based on BMI.

How to use the ideal weight calculator

The ideal weight calculator is a user-friendly tool designed to assess whether your current weight aligns with the ideal range based on sex and height. To effectively use the calculator, follow these steps:

  1. Select units of measurement: Choose your preferred units of measurement (metric or imperial) before entering values. This choice will impact how the calculator interprets your inputs throughout the process.

  2. Sex selection: Indicate your sex. Note that your sex input will be autosaved, eliminating the need to re-enter this information during subsequent visits.

  3. Height input: Enter your height in your preferred unit of measurement. Ensure that your input falls within a range of at least 153 cm (5 ft) tall and 2.72 m (8.9 ft), as calculations are only accurate for heights within this specified range. As with sex selection, your height input will be autosaved, allowing you to resume your assessment if you return to the calculator seamlessly.

  4. Weight input: Enter your current weight. Keep in mind that the minimum weight input is 15 kg (33 lb), and the maximum is 635 kg (1,400 lb). These limits ensure the accuracy of the calculations for a reasonable range of weight values.

  5. Target BMI: If you have a specific BMI goal, you can access the advanced mode at the end of the calculator to indicate your desired value.

  6. Results: After entering the information, the tool will calculate your ideal weight values according to different formulas.

    It will also generate a graph at the end of the calculator to help you visualize the results better.

    Additionally, the tool will present the minimum and maximum values for a healthy weight based on BMI.

For example, suppose you're a male standing at 183 cm (6 ft) tall and weighing 80 kg (176 lb). If you input these values into the calculator, it will determine that your ideal weight varies according to different formulas:

  • Peterson formula: 74 kg (163 lb);
  • Miller formula: 73 kg (161 lb);
  • Robinson formula: 75 kg (165 lb);
  • Devine formula: 78 kg (172 lb);
  • Hamwi formula: 81 kg (178 lb);
  • Broca: 83 kg (183 lb); and
  • Lorentz formula: 75 kg (165 lb).

Additionally, you'll find that for your weight to fall within the healthy BMI range, it should be a minimum of 62 kg (137 lb) and a maximum of 83 kg (183 lb). Note that if you decide to use advanced mode to set a target BMI (for example, 25), your ideal weight, as per Peterson's formula, would change, adjusting from the initial 74 kg (163 lb) to 84 kg (185 lb).

💡 If you're curious about the inner workings of the calculator and the mathematics behind it, keep reading!

How much should I weigh?

There many many ways to estimate somebodies ideal weight. Truth be told, none of them is perfectly accurate, as there are a lot of factors influencing it. For example, for people with a lot of muscle mass (and high lean body mass), their ideal weight will tend to be more than indicated by the results they obtain.

Our ideal body weight calculator uses six different formulae to find your ideal weight, as well as giving you your BMI . While the four formulas listed below give you only one number that you should be aiming for, BMI gives you a certain weight range you should be in.

For men, the ideal weight calculator uses the following equations:

  • Robinson formula: 52 kg + 1.9 kg per every inch over 5 feet;
  • Miller formula: 56.2 kg + 1.41 kg per every inch over 5 feet;
  • Hamwi formula: 48.0 kg + 2.7 kg per every inch over 5 feet;
  • Devine formula: 50.0 kg + 2.3 kg per every inch over 5 feet;
  • Broca formula: height [cm] - 100; and
  • Lorentz formula: (height [cm] - 100) - (height [cm] - 150)/4.

For women, the ideal weight calculator uses the following equations:

  • Robinson formula: 49 kg + 1.7 kg per every inch over 5 feet;
  • Miller formula: 53.1 kg + 1.36 kg per every inch over 5 feet;
  • Hamwi formula: 45.5 kg + 2.2 kg per every inch over 5 feet;
  • Devine formula: 45.5 kg + 2.3 kg per every inch over 5 feet;
  • Broca formula: height [cm] - 100; and
  • Lorentz formula: (height [cm] - 100) - (height [cm] - 150)/2.

🔎 Of these six formulae, the Devine formula is the most medically validated. Robinson's formula and Miller's formula are sometimes referred to as modifications of the Devine formula.

Apart from these six, our calculator also shows your ideal weight according to the Peterson formula, using your target BMI:

Peterson formula: (2.2 × target BMI) + (3.5 × target BMI × (height [m] - 1.5)).

Note that this formula is independent of sex. Our calculator uses 22 as the target BMI by default. You can change this value by clicking on the advanced mode.

💡 Ideal weight is used to compute the dosing of different medicines, e.g., immunoglobulin dose.

Height weight chart and BMI

The last indicator of an individuals ideal weight is BMI, short for Body Mass Index. It is calculated according to BMI = weight/height². The optimal, healthy range for BMI is between 18.5 and 24.9. Our ideal weight calculator converts this back into weight, presenting to you the range of appropriate weights for your height.

You can also take a look at a height-weight chart that shows the ranges of underweight, normal and overweight for various heights:

height weight chart

🙋 If your current weight falls into the ideal weight category, you may want to calculate your maintenance calories requirements.

Limitations of our IBW calculator

Remember that the values found with our ideal body weight calculator are not one hundred percent valid for all. As long as you are in the BMI normal weight range, you are fine - don't go on a strict diet just to reach that specific number!

Also, our IBW calculator is valid for adults only. Don't use it to find the proper weight range of kids - consult a specialist instead. Also, don't use it if you are pregnant. Use pregnancy weight gain calculator instead!

Behind the scenes of ideal weight calculator

The masterminds behind the ideal weight calculator are Łucja Zaborowska, Rita Rain, and Bogna Szyk. They bring diverse expertise to the tool, with Łucja Zaborowska being a medical doctor and an awarded graduate of Jagiellonian University Medical School, Rita Rain as a cognitive scientist, and Bogna Szyk as a civil engineer specializing in process management.

The idea for creating the calculator sparked when Łucja noticed patients struggling with determining their ideal body weight. Recognizing the need for a straightforward solution, she developed a tool to make this process more accessible and convenient for a broader audience. Consequently, she assembled a team that meticulously crafted a user-friendly calculator suitable for both clinical and personal use.

We put extra care into the quality of our content so that they are as accurate and reliable as possible. Each tool is peer-reviewed by a trained expert and then proofread by a native speaker. If you’d like to learn more about our standards, please check the Editorial Policies page.

FAQ

How to calculate ideal body weight in pounds?

To calculate your ideal body weight in pounds, you can use the modified Devine formula.

For men: 110.23 lb + 5.1 lb per every inch over 5 feet.
For women: 100.3 lb + 5.1 lb per every inch over 5 feet.

Which ideal body weight formula is the best?

The most medically validated ideal body weight formula is the Devine formula. Physicians use this formula to calculate the doses of certain drugs, such as levothyroxine or immunoglobulins.

Other formulas don’t differ that much from the Devine formula, and they were mainly designed to try to improve the original formula.

What is the ideal weight for a female?

To determine the ideal body weight for a female, you can use the Devine formula.

In kilograms:
45.5 kg + 2.3 kg for every inch over 5 feet

In pounds:
100.3 lb + 5.1 lb for every inch over 5 feet

For example, for a 5 ft 4 in female, the ideal weight is 54.7 kg (120.7 lb).

Remember, this is only an estimation. There is no one universal weight for every woman your height, and this formula doesn't tell you if you should lose or gain weight. If you have concerns about your current body weight, talk to your physician.

What is the ideal weight loss for a month?

If you want to lose weight, you would probably love to do it as quickly as possible. But think a minute - you didn’t gain those extra pounds overnight, and the same way, they won’t go away overnight.

Doctors say the safe weight loss pace is around 0.25-0.5 kg (0.55-1.1 lb) per week. That means ideally, you should lose no more than 1-2 kg (2.2-4.4 lb) per month.

It might sound discouraging. But a slow, steady weight loss pace is the best way to lose weight without stress — and lose it permanently. Because you wouldn’t like the pound to get back to you, would you?

How do you calculate your ideal body weight?

To calculate your ideal body weight, you can use the Devine formula.

Devine formula for man:
50.0 kg + 2.3 kg for every inch over 5 feet

Devine formula for women:
45.5 kg + 2.3 kg for every inch over 5 feet

The Devine formula only requires your height. There are more ideal body weight formulas, but the Devine one is the most popular and the most validated.

Bogna Szyk, Rita Rain and Łucja Zaborowska, MD, PhD candidate
Sex
Female
Height
ft
in
Current weight
lb
Ideal weight according to:
Peterson formula (2016)
lb
Miller formula (1983)
lb
Robinson formula (1983)
lb
Devine formula (1974)
lb
Hamwi formula (1964)
lb
Broca (1871)
lb
Lorentz formula (1929)
lb
Healthy weight based on BMI
Minimum
lb
Maximum
lb
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