Kids' Clothing Size Chart

Kids' clothing sizes by age band on the label, but by height and weight underneath

A children's garment tag reads an age range — "4-5 years," "6 years" — but that age label is really a shorthand for an underlying height and sometimes weight range that the size was actually cut to, since children of the same age vary in body size far more than adults of the same age do. Checking the height/weight figures a specific brand publishes alongside its age label is more reliable than trusting age alone, particularly for a child who runs noticeably tall, short, slim, or sturdy for their age.

US, UK, and EU age labels rarely align on the same actual body size

Even when two countries both label a garment by age, the underlying height/weight assumption behind "age 6" differs by country and by brand's own growth-chart reference, so a straightforward age-to-age conversion between US, UK, and EU kids' sizing is one of the least reliable conversions on this site — converting via the child's actual height in centimetres against each brand's own published chart is meaningfully more accurate than converting the age number alone.

European sizing is far more likely to state height in centimetres directly

Many European children's clothing brands print the actual height range in centimetres directly on the tag alongside or instead of an age figure, which sidesteps the age-ambiguity problem outright — measuring your child's height and matching it straight to a EU brand's centimetre range is often the single most dependable conversion path available on this entire chart.

Growth spurts make "buying for now" a genuinely different strategy than "buying for later"

Children's height can jump unevenly rather than growing at a steady predictable rate, so a garment sized precisely to a child's current height may be outgrown within a season, while sizing deliberately one size up trades a slightly loose current fit for extra wear time — this is a legitimate, common parenting strategy rather than a sign the conversion itself was wrong.

Different garment categories within kids' clothing don't grow out of step with each other

A child's leg length, torso length, and overall frame don't necessarily grow at the same rate, so a child correctly sized in tops for their age or height can simultaneously need a different size in trousers or dresses — treating each garment category as its own separate sizing decision, rather than assuming one converted size fits everything a child wears, avoids a common frustration for parents shopping internationally.

School uniform sizing follows the same age/height logic, with its own added variable

School uniform pieces, when bought from a uniform-specific supplier rather than general retail, are frequently cut with extra room deliberately built in for a full school year's growth and for layering underneath in colder months, so a uniform piece can run larger than a same-labelled-size item from a general children's clothing brand. Many uniform suppliers also publish sizing in age bands rather than height/weight figures precisely because a uniform is expected to last a full term or year, which makes the age label on a uniform less literal than the age label on ordinary clothing.

Buying across borders for a child means trusting the local height figure over the label

Because age is such an unreliable universal unit for children's body size, the most dependable habit when shopping a foreign kids'-clothing brand is to measure your child's current height in centimetres, then match that number directly against whatever height range that specific brand publishes — treating the age number on the tag as a rough secondary hint rather than the primary sizing signal.

Adjustable waistbands and roll-up cuffs are a deliberate hedge against sizing risk

Many children's brands build in elasticated, drawstring, or button-adjustable waistbands and cuffs specifically because they know age/height sizing will never be precise across a whole population of kids — a garment with this kind of built-in adjustment tolerates an imprecise size conversion far better than a rigid, fixed-waistband piece, and is worth favoring when ordering internationally for the first time from an unfamiliar brand.

Shoe-adjacent items like socks and slippers follow the shoe-size logic instead

Kids' socks, slippers, and similar shoe-adjacent items generally follow the shoe-size-range logic covered on the sock chart elsewhere on this site rather than the age/height logic that governs general kids' clothing, so converting a child's shoe size (rather than their age or height) is the right approach for these specific categories.

Seasonal and layered clothing categories build in more sizing slack on purpose

A winter coat or outerwear piece meant to be worn over other layers is typically cut with more room at a given labelled size than a fitted summer t-shirt at the same label, since the garment is designed to accommodate what's underneath it — comparing a converted size across a t-shirt and a coat from the same brand can look inconsistent for exactly this reason, without either conversion actually being wrong.

Height percentile charts explain why average sizing serves some children poorly

Brands generally build their age-to-height assumption around a population growth-chart median, meaning a child who sits well above or below the height percentile typical for their age will be systematically poorly served by age-only sizing regardless of which country's chart is used — this is precisely why checking actual height against a brand's published range, rather than trusting age, matters more for a child at either extreme of typical growth.

Twin and multiple-birth families face a compounded version of the same problem

Twins and other multiples frequently differ in size from one another despite sharing an exact age, which makes ordering identically-labelled clothing for both children a common source of mismatched fit within the same household — measuring each child individually rather than assuming shared age implies shared size is worth the extra step for multi-birth families specifically.

Special-occasion kids' wear (formal, uniform-adjacent, costume) tolerates less growing room by design

A flower-girl dress, formal suit, or similarly tailored special-occasion piece for a child is generally cut closer to the body than everyday play clothes, since the garment is worn briefly and photographed rather than lived in day to day. Skip the usual buy-ahead-for-growth strategy here and size to a measurement taken as close to the event date as you can manage.

Consignment and secondhand marketplaces often use their own simplified size codes

A resale marketplace specializing in children's clothing sometimes reduces a garment's original size down to a simplified code of its own (small, medium, large by age range) rather than preserving the original brand's age or height label, which loses some of the precision the original tag carried — checking whether a specific listing still shows the original brand and size, not just the marketplace's own simplified code, is worth doing before buying secondhand.

A growth spurt right before a planned photo or event can outrun even a recent measurement

Measuring a child weeks ahead of a formal photo, wedding, or similar planned event can still be outdated if that child hits a sudden growth spurt in the interim, which happens unpredictably and isn't tied to a fixed schedule — remeasuring as close to the actual event date as the ordering timeline allows reduces this specific risk more than measuring further in advance ever can.