The average 5-year-old is about 43 inches tall (3 feet 7 inches), or roughly 109 centimeters. Girls tend to be slightly shorter, averaging closer to 42.5 inches (108 cm). Most 5-year-olds fall somewhere between 40 and 46 inches, and that entire range is considered normal.
Average Height by Sex
Boys and girls at age 5 are close in height, but not identical. Based on WHO growth standards, the median (50th percentile) heights break down like this:
- Boys: approximately 43.0 inches (109.2 cm)
- Girls: approximately 42.5 inches (107.9 cm)
A child at the 25th percentile isn’t “short” in a medical sense, and a child at the 75th percentile isn’t unusually tall. Pediatricians consider anything between the 5th and 95th percentiles to be within the normal range. That means a healthy 5-year-old boy could be anywhere from about 40 inches to 46 inches and still be growing exactly as expected.
What Determines Your Child’s Height
Genetics account for 80 to 90 percent of a child’s height. If both parents are tall, their 5-year-old will likely be on the taller end of the growth chart, and vice versa. Height is what scientists call a polygenic trait, meaning it’s shaped by the combined effect of thousands of small genetic variations rather than a single gene. Most of these variations affect the growth plates, the soft cartilage near the ends of children’s bones where new bone forms as they grow.
The remaining 10 to 20 percent comes from environmental factors. Nutrition is the biggest one. Children who consistently get enough protein, calcium, vitamin D, and calories tend to reach their full genetic potential for height. Chronic illness, poor sleep, and prolonged stress can also slow growth during early childhood, though these effects are usually modest compared to genetics.
Why the Growth Trend Matters More Than One Number
A single height measurement tells you less than you might think. What pediatricians actually watch is whether your child stays on a consistent growth curve over time. A child who has always tracked along the 20th percentile is growing normally. A child who drops from the 60th percentile to the 20th percentile over a year or two may need a closer look, even though both readings fall within the “normal” range.
At age 5, most children grow about 2 to 3 inches per year. Children with growth hormone deficiency typically grow less than 2 inches (5 centimeters) annually, and their growth chart usually shows a drop across two or more percentile lines. This pattern of slowing growth, rather than being short at a single point in time, is the key signal that something may need attention.
How to Measure Your Child Accurately at Home
If you’re tracking your child’s height between checkups, technique matters. A sloppy measurement can be off by an inch or more, which is a big deal when you’re trying to spot changes of 2 to 3 inches per year. The CDC recommends this approach:
- Remove shoes, hats, and bulky hairstyles that could add height.
- Use a hard floor like tile or wood, not carpet.
- Stand the child against a flat wall with no baseboard molding, feet flat and together, legs straight, arms at their sides.
- Check alignment: head, shoulders, buttocks, and heels should all touch the wall (though body shape may prevent all four contact points).
- Use a flat, rigid object like a hardcover book, and lower it until it rests firmly on the crown of the head at a right angle to the wall.
- Keep your eyes level with the book to avoid reading the mark at an angle.
- Mark the wall lightly, then measure from the floor to the mark with a metal tape measure.
Record to the nearest eighth of an inch. Measure at the same time of day if possible, since children can be up to half an inch shorter in the evening due to spinal compression throughout the day.
Percentiles in Context
Growth chart percentiles compare your child to a large reference population. A child at the 30th percentile is taller than 30 percent of children the same age and sex. That’s it. Percentiles are not grades. A child at the 10th percentile with two shorter parents who has always tracked at the 10th percentile is growing perfectly. A child at the 50th percentile who was previously at the 90th percentile is the one who warrants a conversation with their doctor.
The WHO growth standards used for children under 5 are based on data from six countries and reflect how children grow when they have good nutrition and healthcare. After age 2, the CDC growth charts (based on U.S. children) are also commonly used. Your pediatrician may reference either one, and the practical differences at age 5 are small.