Free Australian calculators for parents — metric, accurate, no signup.
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Australian Kids Clothing Size Calculator
Enter your child's height, weight and age to get their AU clothing size for tops, bottoms and dresses — plus a comparison across Target, Kmart and Cotton On Kids.
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Height is the primary guide. Australian clothing sizes are based mainly on height. Weight is used to check whether the waist measurement might need a size up for bottoms. Age is a guide only — children of the same age can be very different sizes.
cm
kg
yrs
Tops & Jumpers
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Bottoms & Pants
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Dresses & Overalls
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Brand size comparison
Brand
Tops
Bottoms
Notes
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Full AU Size Chart
AU Size
Height
Approx age
Chest (cm)
Waist (cm)
Hip (cm)
000
50–56 cm
Newborn–3 months
40–44
42–44
42–45
00
56–62 cm
3–6 months
44–48
44–46
45–49
0
62–74 cm
6–12 months
48–52
46–48
49–53
1
74–86 cm
1–2 years
52–54
48–51
53–56
2
86–92 cm
2 years
53–55
51–52
55–58
3
92–98 cm
3 years
55–57
52–54
57–60
4
98–104 cm
4 years
56–59
53–55
59–62
5
104–110 cm
5 years
59–61
55–57
62–65
6
110–116 cm
6 years
61–64
56–58
65–68
7
116–122 cm
7 years
63–66
57–59
67–71
8
122–128 cm
8 years
65–68
58–61
71–75
9
128–134 cm
9 years
67–70
60–62
74–78
10
134–146 cm
10–11 years
69–73
61–63
77–82
12
146–152 cm
11–12 years
73–77
63–65
82–87
14
152–158 cm
13–14 years
77–81
65–68
87–92
16
158–168 cm
14–16 years
81–86
67–70
92–97
Body measurements based on Australian standard sizing. Age is a guide only — always go by height. AU sizes 11 and 13 are not standard and are rarely stocked.
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Australian children's clothing sizes are based on the Australian standard (ISO 13402) which uses height as the primary sizing dimension. Sizes run from 000 (newborn) through to 16, with height ranges of 6–12 cm per size. Weight is used as a secondary check — a child who is heavier than average for their height may need a size up for bottoms and pants. Age is only a rough guide, as children of the same age can vary significantly in height. Target, Kmart, and Cotton On Kids all use the AU standard as their base, though fit can vary slightly between styles and brands. Always check the brand's own size guide for online purchases. Last updated May 2026.
The Australian standard uses height as the primary dimension because children's builds vary enormously at any given age. A size 6 means "fits a child approximately 110–116 cm tall" — not "for a 6-year-old". This makes the size more predictable across different body types. Most Australian retailers label both the number and an age range on their tags for quick reference.
Tops are primarily sized by chest and height. Bottoms are sized by waist and hip. If your child is taller and slimmer they may fit a larger top but need a smaller bottom, or vice versa. Children with a higher-than-average weight for their height often need a size up for pants and shorts due to waist measurement. Look for styles with adjustable elastic waistbands for a better fit across both dimensions.
All three brands use Australian standard sizing as their base. In practice, the cut and fit can vary between styles and brands — a size 6 from one brand may feel roomier or slimmer than a size 6 from another. Cotton On Kids sometimes label their garments with both the number size and an age range (e.g., "6 / 5–6 yrs"). It's always worth checking the brand's own size guide, especially for online shopping.
These are infant sizes. Size 000 is for newborns (approximately 50–56 cm), 00 is for babies around 3–6 months (56–62 cm), and 0 is for babies approximately 6–12 months (62–74 cm). After size 0, the sizes continue as whole numbers: 1, 2, 3 and so on. Some brands also sell "Newborn" or "0000" sizes for very small or premature babies under 50 cm.
For everyday basics (t-shirts, pants, school uniform) buying one size up is generally fine and gives a few extra months of wear. Avoid sizing up more than one size as very oversized clothes can be uncomfortable and a safety hazard, especially around zippers or waistbands. For fitted items like swimwear or formal wear, buy the current size for the best fit.