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Weight Calculation: Identifying Different Methods to Measure Healthy Body Weight

An article that lists the different methods to calculate your ideal body weight.

A woman wearing white tee and blue jeans measuring her body in front of a mirror

Have you ever stood in front of a mirror, looking at the result on your weighing scale, and asking yourself, “Is my weight ideal? Do I need to lose some weight?” Identifying weight goals based on your body type should be the first step towards a healthy life. Weight calculation using a weight calculator is a good way to start.

In addition, it’s also essential for you to understand the 3 distinct body typesectomorph, mesomorph and endomorph.

Ectomorphs struggle with weight gain and are typically lean with minimal body fat and muscle. Mesomorphs can gain or lose weight quickly whilst having a strong, athletic figure.

Endomorphs, meanwhile, have a large amount of body fat and muscle and can gain weight easily. In Traditional Chinese Medicine (TCM), people who are endomorphs have a Qi or Yang Deficiency body constitution. 

“For people with a Phlegm-Dampness body constitution, I would categorise them as meso-endomorph. They tend to be slightly obese, and their body shape is what we call an apple shape. Their weight gain mainly focuses around the abdomen area,” says Eu Yan Sang’s TCM physician Vong U Chan.

If you want to know the best way to measure your ideal weight, find out more about these 6 different weight calculation methods that you can use and how to measure weight at home.

Weight Calculators to Determine Ideal Body Weight

There are weight calculation methods you can use to estimate body weight by measurements. Using weight calculators is one of the simplest ways to do this. Each weight calculator has a unique set of pros and cons. So which of these is the ideal body weight calculator? The choice is yours.

Body mass index (BMI) calculator

A body mass index (BMI) calculator is the most common weight calculation method used. It can calculate your body fat mass based on your current height and weight and is suitable for both men and women. A BMI calculator uses several categories to identify the risk of negative health implications. It’s easy to use if you want to know how to measure weight at home as you can input this into an online BMI calculator.

These Asian BMI categories include underweight (BMI below 18.5), normal weight (BMI between 18.5 and 22.9), overweight (BMI between 23.0 and 24.9), and obese (BMI above 25). Alternatively, the BMI Percentile Calculator can calculate the body fat of children and teenagers between the ages of 2 and 19. 

Yet, according to Physician Vong, TCM does not only measure your health based on the numerical body weight assessment. It also considers everyday lifestyle indicators such as your appetite, bowel movement, energy levels, and sleep quality.

Relative fat mass (RFM) calculator

A close-up of someone’s feet on a weight scale and a measurement tape
Measuring your height and waist to determine your ideal weight is believed to be the more accurate method.

Like a BMI calculator, a relative fat mass (RFM) calculator’s use is to measure your body fat. However, this weight calculator uses height and waist circumference to determine your correct fat percentage. Some people find that it is more accurate than a BMI calculator so this might be your ideal body weight calculator. 

To get a correct measurement of your height, ensure that your buttocks, upper back, and back of your head are touching a vertical surface. On the other hand, ensure that your measuring tape stretches around the area of your body above the left and right ilium. Ilium refers to the largest and uppermost part of your hip bone.

Robinson formula

The Robinson formula for calculating your ideal body weight is based on the belief that the ideal body weight of a man who is 5 feet tall (152cm) should be 52 kilograms, while a woman should be 49 kilograms.

If you are taller than 5 feet, you should adhere to the following equations: 

  • For men, the suggestion is to add 1.9 kilograms to the base weight per inch (2.5cm) above 5 feet  
  • For women, the suggestion is to add 1.6 kilograms to the base weight per inch above 5 feet

It is worth noting that the Robinson formula is effective if you are of average height. Therefore, it’s not a reliable way to get the ideal body weight for very tall or very short people.

Miller formula

The Miller formula was derived in 1983 and is based on the belief that a man who is 5 feet (152cm) should be 56.2 kilograms, and a woman, 53.1 kilograms. For every additional inch (2.5cm) on top of the 5 feet, this formula suggests the addition of 1.41 kilograms and 1.36 kilograms to a man and woman’s body weight, respectively.

This formula is useful for calculating your ideal body weight during an emergency. For instance, when administering a drug to or adjusting the ventilator setting for a patient, the given estimate will not be conclusive since it leaves out many crucial factors.

Devine Formula

An Asian woman putting a wooden block on her head while standing in front of a height measurement scale
How do you estimate body weight by measurements? The Devine formula uses your height to determine your ideal body weight.

The Devine formula is arguably one of the most applied formulas to date. Originally established to calculate medication dosages, this formula uses a measure of your height to determine your body weight. It is based on the belief that a man’s weight at 5 feet (152 cm) should be 50 kilograms, and a woman’s 45.5 kilograms. 

The weight calculator also suggests adding 2.3 kilograms for every extra inch (2.5 cm) to a man or woman’s body weight.

Hamwi Formula

The Hamwi formula was established in 1964 by Dr. G.J. Hamwi, and is computed using inches and pounds. It prioritises the belief that a 5-feet tall (152 cm) woman should weigh 100 pounds, and a man 106 pounds.

At the same time, for every inch (2.5 cm) over 5 feet, you should add 5 pounds (2.3 kilograms). But if you are shorter, you should subtract 5 pounds for every inch below 5 feet.

The Hamwi formula also uses the ‘body frame’ concept to determine your actual ideal body weight. The adjusted body weight concept requires a measuring tape to get the correct reading of your wrist.

If your wrist measures 7 inches (18 cm), you have a medium-sized body frame and should not adjust the ideal body weight. If your wrist is bigger than 7 inches, you need to add 10%, and if your wrist is smaller than 7 inches, you need to subtract 10% of your ideal body weight to the formula. 

What’s most important is ensuring that you lead a healthy lifestyle. That means, eating right and exercising. An oatmeal beverage is a good source of protein and fibre. Because of this, it’s beneficial for regulating your cholesterol levels and promoting weight control.

For gut health, taking a probiotic supplement containing 100 million friendly Lactobacillus acidophilus bacteria can support a healthy digestive system.  

There are different ways to estimate your body weight using measurements and these weight calculation methods can help. More frequently used are the BMI and RFM calculators and might be considered two ideal body weight calculators. However, combining the use of a weight calculator with different formulas may be the best way to get an accurate idea of whether you are at your healthiest or not.


  1. Harvard T.H Chan. Healthy Weight. [Accessed 2 July 2021] 
  2. University of Houston. The 3 Somatypes.[Accessed 2 July 2021] 
  3. NHS. 2020. Underweight adults. [Accessed 2 July 2021] 
  4. Centers for Disease Control and Prevention. 2020. Adult BMI Calculator.[Accessed 2 July 2021] 
  5. Centers for Disease Control and Prevention. 2021. BMI Percentile Calculator for Child and Teen.[Accessed 2 July 2021] 
  6. DQYDJ. Body Fat Estimate Calculator using Waist to Height Ratio (RFM).[Accessed 2 July 2021] 
  7. BMI-Calculator.net. Ideal Body Weight – J. D. Robinson Formula (1983). [Accessed 2 July 2021] 
  8. BMI-Calculator.net. Ideal Body Weight – B. J. Devine Formula (1974). [Accessed 2 July 2021] 
  9. BMI-Calculator.net. Ideal Body Weight – GJ Hamwi Formula (1964). [Accessed 2 July 2021] 
  10. NCBI. Weight Management: State of the Science and Opportunities for Military Program. [Accessed 2 July 2021] 
  11. Centers for Disease Control and Prevention. 2021. Adult Obesity Causes & Consequences.[Accessed 2 July 2021] 
  12. Northern Illinois Vein Clinic. 2019. Why Good Blood Circulation is Vital to Your Health. [Accessed 2 July 2021] 

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