Kids Dress Size Calculator

A child's size, by height first

Kids' dress labels are named after ages, but they're built on height. Enter her height (and weight if you have it) and get the size that will actually fit.

Find a child's dress size

Free · No sign-up

Height (inches)

Bare feet, standing straight

Weight (lb, optional)

Cross-checks the height

Age (years, optional)

For comparison only

How kids sizing works

Age is a label. Height is the size.

Height governs

A dress hangs from the shoulders; its length and bodice are set by the child's height. Every kids chart is built height-first, and two children of the same age routinely stand four inches apart.

Weight arbitrates

When height lands between two sizes, weight breaks the tie: a child in the upper weight range for her height takes the bigger size; a slight child takes the smaller. This calculator does exactly that.

T means toddler

2T–4T are cut for a toddler's body — rounder tummy, room in the seat. Plain sizes from 4 up are cut for a child. The overlap ages are where parents get caught; measure, don't guess.

Toddler chart

Toddler dress sizes 2T–4T

Size	Typical age	Height up to	Weight up to	Chest	Waist	Hips	EU
2T	2 yrs	36″ / 91.5 cm	33 lb	21″	20.5″	21.5″	EU 92
3T	3 yrs	38.5″ / 98 cm	36 lb	22″	21″	22.5″	EU 98
4T	4 yrs	42″ / 106.5 cm	40 lb	22.5″	21.5″	23.5″	EU 104

Girls chart

Girls dress sizes 4–16

Size	Typical age	Height up to	Weight up to	Chest	Waist	Hips	EU
4	4–5 yrs	41.5″ / 105.5 cm	41 lb	23″	21″	23″	EU 104
5	5 yrs	44.5″ / 113 cm	44 lb	24″	21.5″	24″	EU 110
6	6 yrs	46.5″ / 118 cm	52 lb	25″	22″	25.5″	EU 116
6X	6–7 yrs	48.5″ / 123 cm	57 lb	26″	23″	26.5″	EU 122
7	7 yrs	50.5″ / 128.5 cm	62 lb	27″	24″	28″	EU 128
8	8 yrs	53″ / 134.5 cm	72 lb	28″	25″	29.5″	EU 134
10	9–10 yrs	55″ / 139.5 cm	82 lb	29″	26″	30.5″	EU 140
12	11–12 yrs	57.5″ / 146 cm	94 lb	30.5″	27″	32″	EU 146
14	13 yrs	60″ / 152.5 cm	106 lb	31.5″	28″	33″	EU 152
16	14 yrs	62″ / 157.5 cm	115 lb	33″	29″	34.5″	EU 158

Consensus of published children's charts (leading kids' retailers cross-checked — see methods). EU sizes are the child's height in cm, rounded up.

Worked examples

Three children, sized

52″ tall, age 8

→ Size 8

52″ sits inside the size 8 band (up to 53″). Her age label and her height agree — the easy case.

45″ tall, age 6

→ Size 6

Her age says 6, but 45″ is past the size 5 ceiling (44.5″). Height wins: size 6, even though she won't turn "size 7" for a while yet.

37″ tall, age 3

→ Size 3T

Between 2T (36″) and 3T (38.5″): the first size that contains her height is 3T. In a toddler, growing room is honest — she'll be in it all season.

Buying for children

Three rules that save returns

Measure on the day

Children grow in spurts; a measurement from last season is archaeology. Height against a doorframe takes ten seconds.

One size of growing room, max

A-line and empire styles hide a size of growth gracefully. Two sizes up fits nobody, now or later — proportions change, not just lengths.

Event dresses: fit now

For a wedding or photos, buy for the child she is this month. Growing room is for everyday clothes, not for the dress in the pictures.

Questions

Before you ask

Should I buy my child's dress size by age?

Only as a last resort. Age labels assume an average child, and half of all children aren't average. Height is the measurement kids' sizing is actually built on — a tall six-year-old needs the size 8 length no matter what her birthday says. Use age to find the neighbourhood, height to pick the size.

What is the difference between 4T and 4?

The T is a toddler cut: roomier through the seat (room for a nappy or training pants), a shorter, straighter body. A plain 4 is a child cut — slimmer, longer. Same height band, different proportions. Once a child is out of nappies, the plain size usually fits better.

How much growing room should I buy?

One size, at most — and only in styles that forgive it (A-line, empire waist, adjustable straps). Two sizes up swamps the child now and the dress often fits worse at every stage. For a one-off event dress, fit the child she is this month.

My daughter is between kids sizes and women's sizes. What now?

Around girls' 14–16, compare against the women's chart too — a girls' 16 (33″ chest) overlaps the smallest misses sizes, but the cuts differ: girls' dresses are straighter and higher-waisted. Whichever fits her chest and waist with the better length is the right rail to shop.

Are kids dress sizes the same in the UK and EU?

UK kids sizes are labelled by age like US ones but run slightly different measurements. EU sizes are labelled by height in centimetres — the child's height rounded up (a 128 cm child wears EU 128). The EU system is honestly the most logical of the three, and the chart below includes it.

Every dress tool

Keep going

Estimator

By Height & Weight

No tape measure? Estimate your size from height and weight, then refine it later.

Estimate my size →

Converter

Size Converter

Convert any dress size between US, UK, EU, AU and Canadian sizing instantly.

Convert a size →

Occasion

Wedding Dress Size

Bridal sizes run about two sizes small. See your bridal size before you book the fitting.

Find my bridal size →

Occasion

Prom Dress Size

Junior and formal sizing explained, with measurement tips for a first formal dress.

Find my prom size →

Plus

Plus Size Calculator

Sizes 14W–32W from your measurements, with the plus chart and fit notes that matter.

Calculate plus size →

Weight loss

Weight Loss & Sizes

How many dress sizes will you drop? An honest estimate for your goal weight.

Estimate my future size →

Reference

Full Size Chart

Every size in US, UK, EU and AU — with cm, plus and petite tables included.

See the full chart →

Who made this · How it's sourced

Built by a person, checked against sources

Ian Welkins

Builder & maintainer

I build small, single-purpose calculators and check every number they print. This one exists because dress sizing is a mess of unregulated charts — the least I could do was gather the published ones in one place and show the working.

Found a chart that disagrees with ours? That's exactly what the report-an-error page is for — corrections get checked and the page gets updated.

Last verified: November 2026 · Charts re-checked against the sources listed here

Methods & sources

ASTM D5585Standard tables of body measurements for adult female misses figure type
ISO 8559Size designation of clothes — anthropometric survey definitions
Published brand charts (consensus)Cross-checked across major retailers' published size charts; where brands disagree, the median value is used and the variance disclosed

Method in one line: match each measurement to the consensus chart, round up between sizes, let the largest measurement govern — then adjust for the style of dress.