Height Calculator —
Convert, Compare & Predict

In most cases, no. Once the growth plates (epiphyseal plates) close — typically by age 18 in females and 21 in males — bone length cannot increase. Small variations in perceived height can occur throughout the day (up to 1–2 cm) due to spinal disc compression from gravity. After age 40, gradual height loss of 0.5–1 cm per decade is common due to spinal disc thinning and postural changes.

The Mid-Parental Height (MPH) formula predicts a child’s adult height within ±10 cm for approximately 95% of children. However, it cannot account for all the genetic factors, de novo mutations, or environmental influences that affect actual height. A paediatrician tracking a child’s growth trajectory on a standardised growth chart provides a far more personalised prediction over time.

For adults, height itself is rarely a primary health concern. However, being below the 3rd or above the 97th percentile for height — especially in children — may warrant investigation for underlying hormonal, genetic, or nutritional conditions. Extreme short stature can be associated with conditions such as growth hormone deficiency, hypothyroidism, or Turner syndrome. Unusual tall stature may indicate Marfan syndrome or pituitary gigantism. In adults, height differences are mostly cosmetic and social in nature.

BMI (Body Mass Index) uses height as a core input: BMI = weight (kg) ÷ height (m)². Taller individuals have a larger denominator, so the same weight gives a lower BMI for a taller person. This means tall individuals are less likely to be classified as overweight by BMI alone, while shorter individuals may be classified as overweight at lower absolute weights. This is one limitation of BMI as a universal health screening tool.

Not necessarily. While tall parents have tall children more often than average (the MPH formula captures this), there are important nuances. First, children regress toward the population mean — meaning very tall parents tend to have children who are slightly shorter than them on average. Second, the MPH range of ±10 cm is large. Third, nutrition, health, and sleep during childhood can significantly affect whether a child meets their genetic height potential.

The formula is: cm = (feet × 12 + inches) × 2.54. For example, 5 feet 8 inches = (5 × 12 + 8) × 2.54 = 68 × 2.54 = 172.7 cm. To go the other way: divide total cm by 2.54 to get total inches, then divide by 12 to get feet with the remainder as inches. Our Height Converter above does this automatically.

Consult a paediatrician if your child: (1) falls below the 3rd percentile for height-for-age; (2) consistently grows less than 4–5 cm per year during childhood; (3) has not started puberty by age 14 (boys) or 13 (girls); (4) has a growth rate that has slowed dramatically over 6–12 months; or (5) their height trajectory has deviated significantly from the MPH prediction. Early intervention for hormonal or nutritional causes of short stature can be effective within the growth window.