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Online Height Calculator - Predict Child's Adult Height
Estimate a child's adult height from their age, gender, height, weight, and both parents' heights using the Khamis-Roche method — quick and free.
Expected Adult Height
6 feet 1 inch(es)
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What Is This Tool?
The Adult Height Predictor Calculator estimates how tall a child is likely to grow once fully grown. It uses the Khamis-Roche method, combining the child's gender, age, current height and weight with the average height of both biological parents. You can enter measurements in metric or imperial units, and the tool returns a single estimated adult height that you can copy with one tap. It is designed for children and teenagers up to age 18 and gives a statistical estimate rather than a medical guarantee.
How to Use This Tool?
- Select the child's gender (male or female).
- Choose metric or imperial units for your measurements.
- Enter the child's age, current height and weight, and the height of each biological parent.
- Tap Calculate to see the predicted adult height.
Key Features
- Predicts a child's adult height from age, gender, current height and weight, and both parents' heights using the Khamis-Roche method.
- Switches between metric (cm, kg) and imperial (ft/in, lb) units and converts your existing values automatically.
- Uses separate prediction tables for boys and girls, chosen with a simple gender toggle.
- Validates every field and shows one clear message when the age is outside 0–18 or a measurement is missing or not positive.
- Displays the estimate in your chosen units with one-tap copy to clipboard.
Examples
- A 5-year-old boy measuring 113 cm and 18 kg with parents of 173 cm and 182 cm returns an estimated adult height.
- Switching to imperial lets you enter the same child as roughly 3 ft 8 in and 40 lb, with parents in feet and inches.
- A 10-year-old girl's age, height and weight combine with both parents' heights to estimate her grown-up height.
- Changing only the parents' heights shows how the mid-parental average shifts the prediction.
Common Use Cases
- Parents curious about how tall their child may grow.
- Tracking a child's growth alongside routine pediatric check-ups.
- Comparing likely adult heights between siblings.
- Estimating future height for sports, clothing, or general planning.
- Teaching how genetics and current growth influence adult height.
Tips & Best Practices
- Measure the child's current height and weight as accurately as possible for a better estimate.
- Use recent measurements rather than older ones.
- Enter the heights of both biological parents whenever they are available.
- Recalculate periodically as the child grows and measurements change.
- Treat the result as a statistical estimate, not a medical prediction or guarantee.
Limitations
- Works only for children and teenagers up to 18 years old, not for adults.
- Returns a statistical estimate; a child's actual adult height can differ from the prediction.
- Relies on both biological parents' heights, so accuracy drops when a parent's height is unknown or estimated.
- Does not account for medical conditions, nutrition, or hormonal and growth disorders that affect height.
Frequently Asked Questions
- How does the height calculator predict adult height?
- It applies the Khamis-Roche method, combining the child's age, gender, current height and weight with the average of both parents' heights.
- How accurate is the prediction?
- It gives a reasonable statistical estimate, but real adult height varies with genetics, nutrition, and health, so treat it as a guide rather than a certainty.
- What age range does it support?
- It accepts ages above 0 and up to 18 years, because the method is designed for growing children and teenagers.
- Do I need both parents' heights?
- Yes — the prediction uses the mid-parental height, so entering both biological parents' heights gives the most reliable estimate.
Key Terminology
- Khamis-Roche method
- A validated way to estimate a child's adult height from age, gender, current height and weight, and parental heights, without an X-ray.
- Predicted adult height
- The estimated height a child is likely to reach once fully grown.
- Mid-parental height
- The average of the biological mother's and father's heights, used as a genetic baseline in the prediction.
- Metric system
- A measurement system using centimeters for height and kilograms for weight.
- Imperial system
- A measurement system using feet and inches for height and pounds for weight.