About this Child Height Predictor
While nutrition and environment play a role, genetics is the strongest predictor of height. Pediatricians use the 'Mid-Parental Height' method to give parents a rough estimate of their child's potential adult stature.
Who this calculator is for
- Parents looking for a rough adult-height estimate for a child.
- Families comparing how parental height may influence future growth.
- Anyone seeking a simple mid-parental-height reference before discussing growth concerns with a pediatrician.
When to use it
- Use this calculator for a rough long-term growth estimate based on parent heights.
- Use it when comparing likely adult height ranges for boys and girls.
- Use it as a conversation starter, not as a diagnosis for growth issues.
How to use this calculator
- Select the Child's Gender.
- Enter Father's Height.
- Enter Mother's Height.
- The result shows the predicted height and the likely range.
Key assumptions
- The estimate uses the mid-parental-height method, which centers strongly on genetics.
- It assumes a generally healthy growth environment without significant medical or hormonal disruption.
- This is a broad range estimate and cannot predict exact adult height.
Accuracy and testing
Review formula sources, default test cases, assumptions, unit handling, rounding rules, and changelog for this calculator.
How this calculator works
The formula averages the parents' heights and adds (for boys) or subtracts (for girls) 2.5 inches (6.35 cm).
* Boys: (Dad + Mom + 5 inches) / 2
* Girls: (Dad + Mom - 5 inches) / 2
Inputs explained
Gender
Boys are typically taller than girls due to hormonal differences during puberty.
Parent Heights
The genetic baseline.
Understanding your results
The Predicted Height is the statistical average. The Likely Range is +/- 2 inches (5 cm) from that average, covering about 80-90% of children.
Example scenarios
Boy
Dad 6'0", Mom 5'4". Average parent height adjusted = 5'10.5".
Girl
Dad 6'0", Mom 5'4". Average parent height adjusted = 5'5.5".
Key Features
- Mid-Parental Method
- Likely Range Display
- Simple Interface
Things to Keep in Mind
Does not account for outliers or 'regression to the mean' (very tall parents often have slightly shorter children, and vice versa).
Tips & Best Practices
- This is just a genetic potential. Poor nutrition or illness can stunt growth.
- Children often follow a 'channel' on growth charts. A sudden drop in percentile warrants a doctor visit.
- The Khamis-Roche method (requires current weight/height) is slightly more accurate but requires more data.
Glossary of Terms
- Mid-Parental Height
- A calculation used to predict the target height of a child.
- Growth Plate
- The area of growing tissue near the ends of the long bones in children. Once these close, height is fixed.