Child Height Predictor
Predict a child's adult height from parents' heights using the mid-parental height formula. Get a percentile range estimate instantly in your browser.
Loading tool...
What is Child Height Predictor?
The Child Height Predictor uses the mid-parental height formula to estimate a child's adult height from the parents' heights. It provides a predicted value and a ±10 cm percentile range, calculated instantly in your browser.
Key Benefits
- Simple three-input form: sex, father, mother
- Predicted height with a percentile range
- Based on the widely-referenced mid-parental formula
- Instant, private, and completely free
Common Use Cases
- •Parental curiosity about a child's growth potential
- •Pediatric growth discussions with doctors
- •Educational demonstrations of genetic inheritance
- •Family planning and health tracking
- •Quick reference for school or science projects
Predict a Child's Height
- Choose the child's sex: Boys and girls have different growth patterns, so the formula adds or subtracts 13 cm accordingly.
- Enter parents' heights: Type the father's and mother's heights in centimeters. Decimal values are accepted.
- Read the prediction: The mid-parental formula gives the predicted adult height with a ±10 cm percentile range.
- Interpret the range: Most children reach a height within the shown range, though nutrition and health can shift the outcome.
Key Features
- Mid-parental height formula for boys and girls
- Percentile range: ±10 cm around the predicted height
- Supports decimal heights for precise input
- Instant results with no account needed
- Pure math - completely private and offline-capable
- Simple three-input form: sex, father, mother
Frequently Asked Questions
How accurate is the mid-parental height formula?
It provides a reasonable estimate with about ±10 cm of variation. Most children reach a height within this range, though nutrition, health, and puberty timing can shift the outcome.
Why do boys and girls use different formulas?
Boys typically grow taller than girls at maturity. The formula adds 13 cm for boys and subtracts 13 cm for girls to account for this average difference in adult height.
Can I use this for a toddler?
Yes, the mid-parental formula is independent of the child's current age. However, growth disorders or early/late puberty can shift the actual outcome outside the predicted range.
Does nutrition affect the prediction?
The formula assumes adequate nutrition. Severe malnutrition or chronic illness during growth years can result in a height below the predicted range.