140 cm = 4 ft 7.1 in

140 cm in feet and inches: the exact math

Since the international agreement that took effect on July 1, 1959, the inch has been defined as exactly 25.4 millimeters, according to the National Institute of Standards and Technology (NIST). That makes the conversion for any height in centimeters a single division by 2.54, with no rounding hidden in the constant.

For 140 cm:

• 140 ÷ 2.54 = 55.118 inches
• 55.118 ÷ 12 = 4.593, so there are 4 whole feet (48 inches)
• 55.118 − 48 = 7.12 inches left over
• Result: 140 cm = 4′ 7.12″, usually written 4′7″

The nearest whole-inch height, 4′7″, is 55 inches, or 139.7 cm. The gap is only 0.3 cm, roughly an eighth of an inch, which is why 140 cm and 4′7″ are used interchangeably on forms and growth records. In decimal feet, 140 cm is 4.59 ft. That decimal is a fraction of a foot, not inches: 0.59 ft is the same 7.1 inches.

Unlike most heights on this site, 140 cm is mostly a child's height in the modern United States. That changes what the useful context is: growth charts, booster seats and pediatric norms matter far more than clothing sizes or dating statistics. The rest of this page is built around that.

Who is 140 cm tall? Mostly 10-year-olds

The CDC's 2000 growth charts publish, for every month of age from 2 to 20 years, three numbers called L, M and S. M is the median height; L and S describe how the distribution is skewed and spread. The CDC explains how to turn any measurement into a z-score with the formula Z = ((X ÷ M)^L − 1) ÷ (L × S), and then into a percentile. We applied that method to 140 cm at each birthday.

The median boy and the median girl both pass 140 cm shortly after turning 10. Between ages 8 and 13 the same 140 cm slides from "one of the tallest in the class" to "one of the shortest," which is a good illustration of why a single height number means little for children without the age attached.

Two practical notes on reading that table:

• The CDC itself says growth charts are not meant to be a sole diagnostic tool; they contribute to an overall clinical picture. A single percentile is a snapshot, while a child's pattern across several measurements is what pediatricians watch.
• Girls tend to enter their growth spurt earlier than boys (puberty typically starts around 10 in girls and 12 in boys, as summarized in Wikipedia's human height overview), which is why at age 12 the median girl (151.5 cm) is taller than the median boy (149.3 cm). By age 14 the order has reversed for good.

If you want a percentile for an exact age in months, the height percentile calculator uses the same CDC tables, and the height calculator estimates adult height from a child's current measurements.

140 cm and booster seats

One of the most common reasons parents look up 140 cm is the car. The American Academy of Pediatrics says children are ready to move from a booster seat to the adult seat belt when the belt fits them properly, which it describes as typically happening at around 4 feet 9 inches (144.8 cm) and between 8 and 12 years of age. It adds that most children will not fit a seat belt alone until 10 to 12.

A 140 cm child is about 5 cm (2 inches) short of that 4′9″ guideline. The AAP's fit test is more useful than the number:

1. The shoulder belt crosses the middle of the chest and shoulder, not the neck.
2. The lap belt sits low and snug across the upper thighs, not the belly.
3. The child can sit all the way back with knees bent over the seat edge, without slouching, for the whole trip.

The AAP also says all children younger than 13 should ride in the back seat. Vehicle seats differ, so a 140 cm child may pass the test in one car and fail it in another; the booster manual's own height and weight limits apply too.

140 cm as an adult height

For adults, 140 cm sits far below the usual range. The most recent US reference data come from NHANES, the National Health and Nutrition Examination Survey, which measures participants in mobile examination centers rather than asking them their height. The National Center for Health Statistics published the August 2021–August 2023 results in June 2025.

Because the published table stops at the 5th percentile, the most precise statement possible from NHANES alone is that 140 cm is shorter than at least 95 percent of US adults of either sex. The CDC growth reference goes further at its last age point: at 20 years, 140 cm is about 3.6 standard deviations below the female median of 163.3 cm and about 5.1 standard deviations below the male median of 176.8 cm.

Even among women aged 80 and over, who are the shortest age group in the survey (median 156.9 cm), 140 cm remains below the 5th percentile. Older adults in a cross-sectional survey were born decades earlier, so their shorter average reflects both earlier-generation growth and height lost with age.

Short stature, dwarfism and when to ask a doctor

Medicine has a specific meaning for "short." MedlinePlus, the US National Library of Medicine's consumer health site, says a child is usually considered to have short stature when their height is at least two standard deviations below average, or below the 2.3rd percentile. It also stresses that most short children have no medical problem: some have constitutional growth delay and start puberty later, then catch up, and many simply take after short parents.

Height can also be a feature of genetic conditions. Little People of America (LPA) describes dwarfism as a medical or genetic condition that usually results in an adult height of 4′10″ (about 147 cm) or shorter, and notes there are roughly 400 diagnosed types. For the most common form:

• MedlinePlus Genetics gives the average adult height with achondroplasia as about 131 cm (4′4″) for men and 124 cm (4′1″) for women, and says it affects roughly 1 in 15,000 to 40,000 newborns.
• LPA's FAQ puts the average adult at about 4′0″.

So an adult at 140 cm is inside LPA's height range but taller than the typical person with achondroplasia. Height alone never makes a diagnosis. MedlinePlus advises contacting a child's provider if the child seems much shorter than most peers or appears to have stopped growing; the provider tracks growth over time and may order tests. This page explains published reference data and is not medical advice.

A century ago, 140 cm was an average

Average heights have changed so much that 140 cm was once close to the typical adult woman in some countries. The NCD Risk Factor Collaboration (NCD-RisC) pooled 1,472 population-based studies with measurements from more than 18.6 million people to estimate adult height for everyone born between 1896 and 1996.

NCD-RisC identifies Guatemalan women born in 1896, at 140.3 cm, as the shortest group in the entire study. A century later, women born in 1996 in Guatemala averaged 149.4 cm, still the shortest in the world, while South Korean women gained 20.2 cm, the largest increase of any group. Compare today's averages on the Guatemala, South Korea and Japan pages.

Famous people near 140 cm

Very few public figures are listed this short, and one of the best known is an athlete. Simone Biles is listed by Team USA at 4′8″, about 142 cm, just 2 cm (under an inch) taller than 140 cm. Team USA credits her with 11 Olympic medals, seven of them gold.

The site's catalog of people with their own pages starts higher. Comedian Kevin Hart, at 158 cm in our data, is 18 cm taller than 140 cm, and singer Ariana Grande, at 157.5 cm, is 17.5 cm taller. You can stand a 140 cm figure next to any of them, or next to cartoon and anime characters, in the 3D height comparison tool.

CDC or WHO: which chart applies outside the US?

The percentiles above use the CDC's 2000 charts, the standard reference in American pediatric offices. Many other countries use the World Health Organization's growth reference for ages 5 to 19, published in 2007. The WHO describes it as a reconstruction of the 1977 NCHS/WHO reference: it reuses the original NCHS data, supplemented with data from the WHO child growth standards sample for children under five, and applies the same statistical methods WHO used for its standards for 0 to 60 months, released in April 2006.

The two references are built from different samples and smoothing methods, so a given child's percentile can differ slightly between them, and a pediatrician will use whichever chart is standard in that country and stick with it across visits. The principle does not change: a measurement of 140 cm only becomes meaningful when it is paired with an exact age and sex, and it becomes far more informative when it is one point on a series of measurements taken months apart. Countries also differ in their adult averages, from 149.4 cm for women born in 1996 in Guatemala to 168.7 cm in the Netherlands in the NCD-RisC estimates, which is one reason some health systems prefer national charts.

How 140 cm looks next to other heights

A few reference points help when picturing 140 cm:

• Next to the average US woman (161.2 cm in NHANES 2021–2023), a 140 cm person is 21.2 cm (8.3 inches) shorter.
• Next to the average US man (175.1 cm), the difference is 35.1 cm (13.8 inches).
• Next to the 4′9″ booster guideline, the gap is 4.8 cm.
• Next to 150 cm, the next height page up, the difference is exactly 10 cm (3.94 inches). See 150 cm in feet.

The height difference calculator shows these gaps to scale and estimates where one person's eye line falls on another.

Measuring a child accurately

Because a few centimeters matter for booster seats and growth tracking, measurement technique matters too:

• Shoes off, heels together, with heels, buttocks and shoulders touching a flat wall.
• Head level: the child looks straight ahead rather than up or down.
• Use a flat object, such as a hardcover book, pressed gently down on the crown and held square to the wall, then mark the wall.
• Measure with a steel tape, not a cloth one, and record to the nearest millimeter.
• Note the time of day. One study summarized in Wikipedia's human height article found children lost an average of 1.54 cm between getting up and late afternoon, so measuring at the same time each visit makes changes easier to read.

To convert any measurement in either direction, use the height converter.