Health
Height Calculator
Last updated: June 19, 2026
A height calculator is a dual-purpose measurement utility. It converts height values between imperial units (feet and inches) and metric units (centimeters and meters) to facilitate standard records. Additionally, it incorporates the mid-parental height method to project the estimated adult stature of a child based on the biological parents' heights and the child's gender. Pediatricians and parents use these projections to track developmental trajectories, while researchers use the conversion functions to standardize anthropometric data across different measurement systems.
Pick a mode. In convert mode, enter your height in any common unit and the calculator returns all the others. In mid-parental mode, enter the parents' heights to estimate the child's adult height.
Quick Answer
Convert height measurements between units, or project a child's future adult height using the mid-parental height formula.
Mode
Unit
Disclaimer
The mid-parental height method (Tanner) is a rough estimate. Real adult height also depends on nutrition, health, and individual growth patterns. The estimate has a 95% range of roughly ±4 inches around the predicted value.
Educational tool. Not medical advice. For pediatric growth tracking and concerns, consult a pediatrician.
Height
5 ft 10 in
177.8 cm; 1.778 m; 70 in
1 inch = 2.54 cm exactly. Mid-parental height formula: for boys (mother + father + 5 in) / 2; for girls (mother + father − 5 in) / 2.
Examples
5 ft 10 in
= 70 in = 177.80 cm = 1.778 m
175 cm
≈ 5 ft 8.9 in = 68.90 in
Boy: mother 5 ft 4 in, father 6 ft 0 in
≈ 5 ft 10.5 in
Girl: mother 5 ft 6 in, father 5 ft 11 in
≈ 5 ft 4 in
How it works
Height conversion uses the exact conversion 1 in = 2.54 cm. Mid-parental height uses the standard Tanner formula with a 5-inch sex adjustment.
Boy · (mom + dad + 5 in) / 2
Girl · (mom + dad − 5 in) / 2
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Frequently asked questions
1 inch is exactly 2.54 cm. So 5 ft 10 in = 70 in × 2.54 = 177.80 cm. The calculator does this for every common unit pair.
For boys, predicted adult height = (mother's height + father's height + 5 in) / 2. For girls, predicted adult height = (mother's height + father's height − 5 in) / 2. The 5-inch adjustment captures the average difference between adult male and female heights.
The mid-parental method has a 95% confidence range of about ±4 inches around the predicted value. Individual outcomes depend on nutrition, health, and timing of growth spurts.
The mid-parental estimate is for predicted adult height. It works best when both parents' final adult heights are known. For tracking a growing child's percentile, a pediatrician uses growth charts (CDC or WHO), which this calculator does not include.
No. The calculator is an educational tool. For pediatric growth concerns or short stature evaluation, consult a pediatrician who can use growth charts and bone-age imaging.
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