Height Calculator – Predict Adult Height & Convert Units
The Height Calculator helps you instantly convert height between centimeters, meters, and feet & inches, or predict a child's adult height using the mid-parental height formula. Whether you need a quick unit conversion or want to estimate how tall your child will grow, this free tool delivers accurate results in seconds. Simply select your calculation type, enter the required values, and get your answer right away.
Only used when Calculation Type is Unit Conversion.
Enter height in centimeters to convert to feet and inches.
Whole feet portion of your height.
Remaining inches portion of your height (0–11).
Used for the mid-parental height prediction formula.
Enter the biological father's height in centimeters.
Enter the biological mother's height in centimeters.
Your results will appear here
How to Use This Calculator
1. Choose your calculation type: select 'Unit Conversion' to convert between metric and imperial height units, or 'Child Height Predictor' to estimate a child's adult height. 2. For unit conversion, pick whether you're starting from centimeters or feet & inches, then enter your height value. 3. For the child height predictor, select the child's gender and enter both the biological father's and mother's heights in centimeters. 4. Click 'Calculate' to instantly see the results, including the converted height in all units or the predicted adult height with a typical range.
How Height Conversion Works
Height is measured in different units around the world. The metric system uses centimeters (cm) and meters (m), while the imperial system uses feet (ft) and inches (in). The core conversion factors are:
- 1 inch = 2.54 centimeters
- 1 foot = 12 inches = 30.48 centimeters
- 1 meter = 100 centimeters
To convert centimeters to feet and inches, divide the total centimeters by 2.54 to get total inches, then divide by 12 for feet and take the remainder as inches. To convert feet and inches to centimeters, multiply the total inches by 2.54.
Mid-Parental Height Formula
The mid-parental height method is a widely used, evidence-based approach to predict a child's adult height based on the heights of both biological parents. It was developed by pediatric endocrinologists and is used clinically around the world.
Formula for Boys
Predicted Height = (Father's Height + Mother's Height + 13 cm) ÷ 2
Formula for Girls
Predicted Height = (Father's Height + Mother's Height − 13 cm) ÷ 2
The 13 cm adjustment (approximately 5 inches) accounts for the average height difference between adult males and females. The result represents the child's target height, with a typical range of ±8.5 cm (roughly ±3.4 inches), which captures approximately 95% of children with similar parental heights.
Factors That Affect Height
While genetics account for approximately 60–80% of adult height variation, other factors also play important roles:
- Nutrition: Adequate protein, calcium, and vitamins D and K are essential for bone growth during childhood and adolescence.
- Sleep: Growth hormone is primarily secreted during deep sleep, making sufficient rest critical for children.
- Physical Activity: Weight-bearing exercise stimulates bone density and healthy development.
- Health Conditions: Chronic illness, hormonal disorders, or growth hormone deficiency can affect final adult height.
- Gender: Boys typically have a longer growth period and experience puberty-related growth spurts later than girls.
When Do We Stop Growing?
Most females reach their final adult height between ages 14–16, while most males continue growing until ages 17–20. Growth plates (epiphyseal plates) in the bones close after puberty, signaling the end of height increase. If you're concerned about a child's growth trajectory, consult a pediatrician or pediatric endocrinologist.