How Tall Will I Be?
Find Out with Our Height Prediction Tool
This child height calculator estimates a child’s future adult height based on either their current measurements or the height of their parents. The prediction is based on proven statistical models such as linear regression analysis and established medical methods like the Khamis-Roche formula.
Height Prediction Calculator
Estimate adult height for children using advanced Khamis-Roche method, parents’ height, or convert between measurement systems
Child Height Prediction
Predicted Adult Height
Based on Khamis-Roche method for children 4-9 years
Parents’ Height Prediction
For unborn children or young infants
Predicted Adult Height
Based on parents’ height only
Height Converter
US to Metric
Metric to US
Understanding Height Prediction
“How tall will I be?” or “how tall will my child be?” are common questions. Height is determined by genetics (60%-80%) and environmental factors. This calculator uses scientific methods to predict adult height.
How Height Prediction Works
We use two different methods for prediction:
- Khamis-Roche Method: The most accurate non-invasive method for children 4-9 years. It considers child’s current height, weight, age, gender, and parents’ heights.
- Parents’ Height Method: For unborn children or very young infants, using only parents’ heights with gender adjustment.
Important: Height prediction is not an exact science. Final height can be influenced by nutrition, health, activity levels, and other factors. These calculators provide estimates only.
Factors Affecting Height
- Genetics: The primary factor (60-80% of height determination)
- Nutrition: Adequate protein, calcium, and vitamins
- Sleep: Growth hormone is released during sleep
- Health: Chronic illnesses can affect growth
- Prenatal environment: Mother’s health during pregnancy
Maximizing Growth Potential
While genetics sets limits, you can optimize growth potential:
- Eat a balanced diet rich in protein, calcium, and vitamins
- Get adequate sleep (8-11 hours depending on age)
- Exercise regularly, especially stretching and strength activities
- Maintain good posture
- Avoid growth-stunting factors like smoking and malnutrition
Growth Patterns
Children grow fastest as infants, with growth slowing around age 2. A second growth spurt occurs during puberty, typically ending around age 15 for girls and 18 for boys.
How to Use the Height Calculator
To begin, simply input the following details and click the “Calculate” button:
- Child’s Age
- Child’s Gender
- Current Height and Weight
- Mother’s and Father’s Heights
Choose from:
- US Units
- Metric Units
- Other Units
Parent-Based Height Prediction
This option predicts a child’s adult height using only the parents’ heights. It’s ideal for estimating the height of very young children or unborn babies when current child height/weight is unavailable.
Input:
- Mother’s Height: 164 cm
- Father’s Height: 178 cm
Height Converter – Easily Switch Between Units
Use this simple height converter to switch between metric and US units:
US to Metric:
- 5 feet 5 inches = 165 cm
Metric to US:
- 178 cm = 5 feet 10 inches
Understanding Growth: What Affects Your Height?
Genetics vs. Environment
The biggest influence on your child’s height is genetics, accounting for roughly 60–80% of growth potential. However, nutrition, physical activity, and general health play key supporting roles.
- Genetics: Children of taller parents are more likely to be tall. However, height often regresses toward the average.
- Nutrition: A balanced diet supports healthy bone growth.
- Exercise: Promotes strong bones and proper posture.
- Maternal Health: The mother’s health during pregnancy also affects growth outcomes.
Growth Patterns by Age
- Infants and Toddlers: Rapid growth from birth to age 2.
- Childhood: Steady growth continues through pre-puberty.
- Puberty Growth Spurt: Increased height gain, ending around age 15 for girls and 18 for boys.
- Adulthood: Height stabilizes; some shrinkage may occur in older age due to spinal compression and bone density loss.
Height Prediction Methods
1. Khamis-Roche Method
Uses child’s current age, height, weight, and average parental height. Most accurate for healthy Caucasian children aged 4–9. No X-rays required.
2. Bone Age Assessment (Greulich-Pyle Method)
Involves wrist X-rays to assess skeletal maturity. More precise but requires medical imaging. This method compares X-rays with historical bone age charts.
Note: Data from the Greulich-Pyle Atlas may have limited accuracy for children outside the original demographic (Caucasian children, 1931–1942).
3. Growth Charts (CDC Standards)
The CDC provides percentile curves based on large-scale data. Compare your child’s height and weight with peers to assess their growth trajectory.
4. Simple Math Methods
- For boys: (Mother’s Height + Father’s Height + 13 cm) ÷ 2
- For girls: (Mother’s Height + Father’s Height – 13 cm) ÷ 2
- Another method: Double the child’s height at age 2 (boys) or at 18 months (girls) for a rough estimate.
Tips to Maximize Growth Potential
Although genetics plays a major role, lifestyle factors also influence height:
- Eat Nutritious Foods – Fresh vegetables, fruits, lean proteins, and dairy support bone health.
- Avoid Junk Food – Minimize sugar, trans fats, and excessive sodium.
- Stay Active – Exercise promotes growth hormone release and strengthens bones.
- Maintain Good Posture – Slouching can lead to height loss over time.
- Get Quality Sleep – Growth hormone is released during sleep; children need more rest during growth years.
- Monitor Health – Address any chronic conditions or nutritional deficiencies with your pediatrician.
When Does Growth Stop?
- Girls: Usually stop growing by age 15.
- Boys: Growth typically ends by age 18.
- Adults: Height remains steady until late adulthood, when natural shrinkage may begin.
