Method 1: The Khamis-Roche Height Predictor
Mother's height
ft
in
Father's height
ft
in
Child's sex
girl
Child's age
4 years
Child's height
ft
in
Child's weight
lb
Child's future height
ft
in
Method 2: Mid-Parental Height Calculator
Mother's height
ft
in
Father's height
ft
in
Girl's future height
ft
in
Boy's future height
ft
in

This height calculator answers the question of how tall will your children be. We use two very different methods and describe in detail how to calculate a child's height. If you already have a child over four years old, our future height calculator uses a scientifically proven formula to determine it. But if your kid is younger or you're just wondering, we have a child height predictor that counts child height based on parents' height. It's called the Mid-Parental Height Formula.

What does a child's height depend on?

The single most significant factor here is genetics. The other important factors are:

  1. Nutrition - growth requires a lot of energy! Overweight children tend to be higher than others, but staying fit is crucial for their development. You can check your ideal weight using our ideal weight calculator.
  2. Hormone levels, especially growth hormone or thyroid hormones.
  3. Health conditions, such as coeliac disease or arthritis.
  4. Medications, such as corticosteroids, can affect growth.
  5. Genetic conditions: for example, children with Marfan's syndrome tend to grow higher, while children with Down's syndrome are usually shorter than others.

How tall will I be? - how to calculate a child's height

There are a few methods of predicting the growth of a child. There are a few advanced techniques based on current child's height, and some of them require an X-ray of a child's hand to define the skeletal age. The one we provide here (the Khamis-Roche Formula) is proven to be the most accurate without the use of skeletal age. The most straightforward method (Mid-Parental height formula) is based on parents' height.

The Khamis-Roche Child Height Predictor

The adult height of a child can be predicted using a simple mathematical equation using parent height, current child height, and current child weight. It's valid for children above the age of four. This method of height prediction is known as the Khamis-Roche Method, and it was developed in 1994 at Wright State University in Dayton, Ohio. The publication of Dr. Harry Khamis and Dr. Alex Roche was called Predicting adult stature without using skeletal age: the Khamis-Roche method. It's the most accurate method of child height prediction without determining the skeletal age. You can access it here.
For boys, the margin of error is 2.1 inches, and for girls the margin is 1.7 inches. Please note that this future height calculator was developed by research on a group of Caucasian children, so it can be less accurate for kids of other ethnicities.

The Mid-Parental Height Calculator and Formula

The mid-parental formula is the easiest way to calculate child height based on parents' height. Here is how it works:
  1. Let's calculate the mid-parental height:

(mother's height + father's height)/2

  1. For a girl's future height, subtract 2½ in (or 6,5 cm):

girl's height = mid-parental height - 2½ in (or 6,5 cm)

  1. For a boy's future height, add 2½ in (or 6,5 cm):

boy's height = mid-parental height + 2½ in (or 6,5 cm)

You can expect a margin of error of about four inches up or down. You can convert metric to imperial length units using our length calculator.

Child's height is primarily determined by genetics. However, it does not depend solely on the parents' height. It's inherited in a way so that children may be taller or shorter than their parents, since height inheritance is polygenic - the answer to how tall your child will be is scattered among many genes.

Growth Charts

Standardized growth charts are an essential tool used by doctors to determine whether a child grows as expected. They are based on regular measurements of a child's height, weight, head size, and BMI. To find out those values, you can use our BMI calculator.
The most popular charts are the WHO Charts for infants and children ages 0 to 2 and CDC Charts for children above 2. You can check them here. They are also helpful for judging the onset of puberty in an older child.

Remember that Omni Calculator is not a doctor. If you believe your child is too short or too tall, please consult a pediatrician.

Małgorzata Koperska, MD

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Child Height Predictor - How Tall Will I Be?