Kids clothing · EU/UK height size 140
What age is size 140 in kids clothes?
Size 140 is a height size: it is cut for a child about 140 cm (4 ft 7 in) tall. Typical age: 9.7 years to 10.9 years. Closest US size: 10.
The short answer
In UK and EU kids' clothing the size number is body height in centimetres, so size 140 suits a child about 140 cm tall. A 6 cm step between sizes means one size covers roughly 137 to 143 cm. On the CDC and WHO growth charts the median boy reaches 140 cm at 10.3 years and the median girl at 10.4 years. Children in the 137 to 143 cm band are typically 9.7 years to 10.9 years old. Because children vary a lot, the 3rd to 97th percentile range (the middle 94 percent of children) means a 140 cm child can be anywhere from 8.1 years to 12.8 years. That is typical growth, not a fit guarantee: brands run small or large, and children grow, so size up one bracket for growth room.
Use the calculator with your child's exact height, age or foot length to get EU/UK, US and shoe sizes.
Neighbouring sizes
| EU/UK size | Height it suits (read from the 6 cm step) | Typical age (median height) | Closest US size |
|---|---|---|---|
| Size 134 | 131-137 cm | 8.6 years to 9.7 years | 8 or 10 |
| Size 140 | 137-143 cm | 9.7 years to 10.9 years | 10 |
| Size 146 | 143-149 cm | 10.9 years to 11.8 years | 10 or 12 |
Heights at age 10 (CDC/WHO)
For comparison, the middle 94 percent of 10-year-old boys are 127-151 cm (median 139); girls 126-151 cm (median 138). Values are the 3rd to 97th percentile with the 50th percentile (median) in brackets. Percentiles describe how children vary; they are not a health assessment.
How this was worked out
Size 140 is read as height 140 cm. The age at which the median height reaches 140 cm comes from the WHO standards (to age 5) and CDC charts (age 5 and up), linearly interpolated between published points. The "typical" band is the age the pooled boy-and-girl median passes 137 cm to the age it passes 143 cm. The wide range is the age the 97th percentile child is 140 cm to the age the 3rd percentile child is 140 cm. The US size is the age size nearest the pooled median age for 140 cm; US sizes are labelled roughly by age, and the CPSC rules in 16 CFR 1615 and 1616 list size names only, not heights.
Sources and as-of date. Height data: CDC stature-for-age percentile data (2 to 20 years) (CDC growth charts) and WHO Child Growth Standards, length/height-for-age (0 to 5 years). Size designation: the EN 13402 series (ISO 3635 lineage) uses body height in centimetres as the primary dimension for children's clothing. US size names: 16 CFR 1615 and 16 CFR 1616 (CPSC sleepwear rules list sizes 9-12 months up to 14, but give no height chart). Shoe sizing: ISO/TS 19407:2023. Data files read on 2026-10-02.
Frequently asked questions
What age is size 140 in kids UK clothes?
UK and EU kids' sizes are height sizes, so size 140 is cut for a child about 140 cm (4 ft 7 in) tall, not for a set age. By CDC and WHO median heights, children are typically 9.7 years to 10.9 years old when they are 137 to 143 cm tall. Brands print age labels too, and those can differ from this figure, so trust the height.
Should I buy size 140 or size 146?
Measure your child barefoot against a wall. If they are about 140 cm, size 140 fits now; if you want room to grow or the brand runs small, take size 146. Children grow roughly 5 to 7 cm a year between ages 4 and 10, so one size up is usually good for a season.
Is size 140 the same in the US?
Not exactly. US sizes are labelled roughly by age in years, and there is no single public height chart. Matching by the median age for 140 cm gives about size 10 (12 is the next one up). Check the brand's own chart.