How do you calculate BMI for infants?

How do you calculate a baby’s BMI?

Body-Mass Index Formula

  1. Multiply their weight (in pounds) by 703. 184 × 703 = (A) 129,352.
  2. Multiply their height (in inches) by itself. 69 × 69 = (B) 4,761.
  3. Divide (A) by (B)


What is a normal BMI for a baby?

For children, BMI is presented as a percentile, which plots the child’s BMI next to other children of the same age and sex. Falling between the 5th and 85th percentiles is considered normal and healthy.

Do you use BMI for infants?

BMI is used to assess obesity in children and adults,6 and the World Health Organization (WHO) has published BMI standards for infants.

How do you calculate BMI with age?

The formula is BMI = kg/m2 where kg is a person’s weight in kilograms and m2 is their height in metres squared. A BMI of 25.0 or more is overweight, while the healthy range is 18.5 to 24.9. BMI applies to most adults 18-65 years.

How do you calculate BMI manually?

Then, calculate BMI by dividing weight in pounds (lb) by height in inches (in) squared and multiplying by a conversion factor of 703. When using a handheld calculator, if your calculator has a square function, divide weight (lb) by height (in) squared, multiply by 703, and round to one decimal place.

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What is a good BMI for child?

Healthy weight: BMI is equal to or greater than the 5th percentile and less than the 85th percentile for age, gender, and height. Overweight: BMI is at or above the 85th percentile but less than the 95th percentile for age, gender, and height.

How do you calculate BMI example?


  1. Formula: weight (kg) / [height (m)]2 With the metric system, the formula for BMI is weight in kilograms divided by height in meters squared. …
  2. Example: Weight = 68 kg, Height = 165 cm (1.65 m)
  3. Calculation: 68 ÷ (1.65 x 1.65) = 24.98.

What is my child’s ideal weight?

Your child is a healthy weight if their BMI for age and sex is from the 5th to below the 85th percentile. A child below the 5th percentile is below a healthy weight (underweight), and a child at the 85th percentile and above is above a healthy weight.

How do you calculate BMI percentile?

BMI is calculated using your child’s weight and height and is then used to find the corresponding BMI-for-age percentile for your child’s age and sex. BMI-for-age percentile shows how your child’s weight compares to that of other children of the same age and sex.

At what age is BMI The lowest?

An early “adiposity” rebound, occurring before ages 4 to 6, is associated with obesity in adulthood. In the example shown here, adiposity rebound occurred at around age 3. BMI reached the lowest point at 32 months (2 years 8 months) and then began to increase.

How is overweight defined in infants?

Overweight is defined as a BMI at or above the 85th percentile and below the 95th percentile for children and teens of the same age and sex. Obesity is defined as a BMI at or above the 95th percentile for children and teens of the same age and sex.

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Is my baby underweight?

In general, an infant born at term is considered underweight when their weight-for-age measurement is in the 5th percentile or less. (This is not necessarily the case if your baby was born premature or with certain health conditions.)

What is the fastest way to calculate BMI?

How to Calculate Your Body Mass Index

  1. Multiply your height in inches times your height in inches.
  2. Divide your weight by the number you arrived at in Step 1.
  3. Multiply the number you came up with in Step 2 by 705. The result is your BMI.

Does age affect BMI?

For adults ages 20 years and older, BMI incorporates weight and height, but it does not take age or sex into account. A woman tends to have more body fat than a man with the same BMI. Likewise, an older person tends to have more body fat than a younger person with an equal BMI.

What is a good BMI?

For most adults, an ideal BMI is in the 18.5 to 24.9 range. For children and young people aged 2 to 18, the BMI calculation takes into account age and gender as well as height and weight. If your BMI is: below 18.5 – you’re in the underweight range.

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