Find a kid size that actually fits, no matter what the label says
Grandma bought a bodysuit in size 68. Your aunt sent a t-shirt labeled 6M. The neighbour asks whether that onesie is 2T or 24M. Same kid, four different labels. The question: which one actually fits your child?
Pick age, height or a size you already know (EU, US, UK) and the converter shows all the other systems at once. Plus the Japanese (JP) size, used by stores like Uniqlo, and the nearby sizes, two up and two down, in case your kid runs tall or short for their age.
The converter has three sections: baby (0-2 years), kids (2-14 years) and shoes (0-12 years). The single most important rule: size by height, not by age. A 4-year-old can be 100 cm or 110 cm: that is one full size apart.
How to use it
- Pick a category in the top bar: baby 0-2 years (sizes 56-92), kids 2-14 years (sizes 92-164) or shoes (a separate table).
- Pick what you know in the second bar: age (in months for babies, in years for kids), height in centimetres, or a ready-made EU, US or UK size.
- Type or pick a value. The converter shows all the other sizes at once, including Japanese (JP), which sits about 5 cm higher than EU for the same body.
- Below the headline you see two sizes smaller and two larger, in case your kid is taller than the age average or small and slim.
- For shoes type the age, the foot length in centimetres (the most reliable measure, heel to longest toe), or a ready-made EU/US/UK size.
- The notes section explains why height beats age for sizing, what 3M or 6M means on a baby tag (hint: not what you think) and how much growing room to leave in a shoe (1 cm).
When this is useful
Six typical situations where this converter ends the guessing:
- Ordering a bodysuit from a US store. The store shows 9M, 12M, 18M. Your baby is 10 months old and measures 76 cm. Type the height, you see: EU 80, US 12M, UK 9-12M, JP 80. You know 12M, not 9M, is right (the US label means "fits up to this age", not "for this age").
- An aunt in Germany sends a gift. She asks for your 5-year-old's size. You measure: 110 cm. Type it, you see: EU 110, US 5, UK 4-5, JP 115. You text her a concrete number instead of a vague guess.
- Buying winter boots. Your 3-year-old wears EU 24 but you are shopping on a US site. Converter: EU 24 = US 7.5, UK 7, foot length 14.5 cm. You go up to US 8 to leave a centimetre of growing room plus space for a thick sock.
- You got a gifted outfit tagged "2T". You have no idea whether that is for a 1-year-old, a 2-year-old or a 3-year-old. Converter: 2T = EU 92, kid around 18-24 months. Straight to the "next summer" drawer.
- Buying pyjamas at Uniqlo. It is a Japanese brand, sizes are in height in cm. Your kid is 110 cm. At Uniqlo you grab 115, because the Japanese chart sits 5 cm higher than the European one for the same fit.
- Doing a wardrobe audit after summer. Your child is now 104 cm, clothes are tagged 98. Converter: 98 fits up to 95-100 cm, now you need 104 (EU 104, US 4T, UK 3-4). You know exactly what to replace.