Height Chart for 18-Year-Old Girls
At 18 years, the median in the CDC table for girls is 163.1 cm (5 ft 4.2 in), which is 99.9% of the median at age 20 (163.3 cm). The 3rd percentile is 150.9 cm and the 97th is 175.3 cm.
| Percentile | Metric | Feet-inches |
|---|---|---|
| 3rd | 150.9 cm | 4 ft 11.4 in |
| 5th | 152.5 cm | 5 ft 0.0 in |
| 10th | 154.8 cm | 5 ft 1.0 in |
| 25th | 158.8 cm | 5 ft 2.5 in |
| 50th | 163.1 cm | 5 ft 4.2 in |
| 75th | 167.5 cm | 5 ft 5.9 in |
| 90th | 171.4 cm | 5 ft 7.5 in |
| 95th | 173.8 cm | 5 ft 8.4 in |
| 97th | 175.3 cm | 5 ft 9.0 in |
Check a height against this row
Accepts 137.1 to 188.9 cm.
How much the median still changes after 18 years
Six months on, the median is 163.2 cm, a change of 0.1 cm; a year on it is 163.3 cm, a change of 0.2 cm. From this age to 20 the table adds 0.2 cm to the median in total.
Every 12-month gain in the girls' median that starts at 14 years 7 months or later is under 1 cm. The largest 12-month gain after age 6 is 7.3 cm, from 11 years 1 month, so the steep part of the table is already behind this age.
Across the next 12 months the lowest line shown, the 3rd percentile, moves up 0.1 cm, and the highest, the 97th, moves up 0.1 cm. The two lines move almost in step, so the gap stays near 24.4 cm.
| Age | 3rd | 50th | 97th | Change |
|---|---|---|---|---|
| 16 years | 150.4 | 162.6 | 174.8 | |
| 17 years | 150.7 | 162.9 | 175.1 | +0.3 |
| 17 years 6 months | 150.9 | 163.0 | 175.2 | +0.1 |
| 18 years | 150.9 | 163.1 | 175.3 | +0.1 |
| 18 years 6 months | 151.0 | 163.2 | 175.3 | +0.1 |
| 19 years | 151.0 | 163.3 | 175.4 | +0.1 |
| 20 years | 151.1 | 163.3 | 175.5 | +0.0 |
Where the 3rd and 97th percentiles sit
The middle half of the reference, from the 25th to the 75th percentile, spans 8.7 cm; the 3rd-to-97th range spans 24.4 cm. For girls, that range is widest at 11 years 6 months (28.0 cm).
Measured against younger girls, an 18-year-old girl on the 3rd percentile (150.9 cm) roughly matches the median girl of 11 years 11 months (150.9 cm). The 97th-percentile height (175.3 cm) is 12.0 cm above the median at 20 (163.3 cm).
Girls and boys at 18 years
Boys of the same age have a median of 176.2 cm, 13.1 cm above the girls' median. At 20 the gap between the two medians is 13.5 cm. The girls' median is higher than the boys' only from 10 years 9 months to 13 years 2 months.
When to talk to a doctor
If growth has slowed unexpectedly, a teen is crossing downward through percentile lines, or puberty seems unusually early or late, speak to a pediatrician or family doctor. A percentile on its own is not a diagnosis or a measure of health.
Reference values only, not medical advice. How these tables are built.