Predict a child's adult height using Mid-Parental and Khamis-Roche methods, convert between height units, and compare against average heights worldwide.
Predict a child's adult height based on current measurements and parent heights.
| Method | Predicted Height | Range |
|---|---|---|
| Khamis-Roche | 130.2 cm / 4′ 3.2″ | 128.0–132.3 cm |
| Mid-Parental | 178.0 cm / 5′ 10.1″ | 169.5–186.5 cm |
| Country | Men (cm) | Women (cm) |
|---|---|---|
| Netherlands | 183.8 / 6′ 0.4″ | 171.1 / 5′ 7.4″ |
| Montenegro | 183.2 / 6′ 0.1″ | 169.4 / 5′ 6.7″ |
| Denmark | 181.9 / 5′ 11.6″ | 167.2 / 5′ 5.8″ |
| Norway | 181.7 / 5′ 11.5″ | 167 / 5′ 5.7″ |
| Germany | 180.6 / 5′ 11.1″ | 166.3 / 5′ 5.5″ |
| Sweden | 179.9 / 5′ 10.8″ | 166.1 / 5′ 5.4″ |
| Australia | 179.2 / 5′ 10.6″ | 165.5 / 5′ 5.2″ |
| United States | 177.1 / 5′ 9.7″ | 163.5 / 5′ 4.4″ |
| United Kingdom | 177 / 5′ 9.7″ | 163.7 / 5′ 4.4″ |
| Canada | 177 / 5′ 9.7″ | 163.9 / 5′ 4.5″ |
| France | 176.5 / 5′ 9.5″ | 163 / 5′ 4.2″ |
| Brazil | 173.5 / 5′ 8.3″ | 160.9 / 5′ 3.3″ |
| Japan | 172 / 5′ 7.7″ | 158.8 / 5′ 2.5″ |
| China | 171.8 / 5′ 7.6″ | 159.7 / 5′ 2.9″ |
| India | 165.3 / 5′ 5.1″ | 152.6 / 5′ 0.1″ |
Our free height calculator predicts a child's likely adult height using the Khamis-Roche method, a scientifically validated formula based on the child's current height, weight, age, and parents' heights. It also includes a simple unit converter for switching between centimeters and feet/inches.
The Khamis-Roche method estimates adult height using: Predicted Height = b0 + (b1 × current height) + (b2 × current weight) + (b3 × mid-parental height), where the coefficients (b0-b3) vary by the child's age and sex, based on data published by Khamis and Roche (1994).
Mid-parental height is calculated by averaging the mother's and father's heights (with a standard adjustment for the child's sex), since height is strongly influenced by genetics.
This method is considered one of the more accurate non-clinical predictors of adult height for children ages 4-17.5, though actual adult height can still vary due to nutrition, health, and growth timing.
The Khamis-Roche method is one of the most accurate non-clinical methods available, with a typical margin of error of about 2-3 inches for most children, though individual results can vary based on growth timing, nutrition, and health factors not captured in the formula.
Predictions tend to become more reliable as a child approaches puberty and their growth pattern becomes more established, generally ages 8 and up, compared to predictions made for very young children.
Research suggests genetics account for roughly 60-80% of height variation between individuals, with the remaining percentage influenced by nutrition, overall health, sleep, and environmental factors during childhood and adolescence.
Mid-parental height, the average of both parents' heights, is one of the strongest predictors of a child's eventual adult height, since height is a highly heritable trait passed down from both sides of the family.