UK to US School Uniform Size Conversion
| UK Age | US Age |
|---|---|
| 2-3 | 2T |
| 3-4 | 3T |
| 4-5 | 4 |
| 5-6 | 5 |
| 6-7 | 6 |
| 7-8 | 7 |
| 8-9 | 8 |
Sizing conventions vary by brand and by cut — this table shows the standard published conversion. Always check the garment's own size chart when one is available. See how these tables are compiled.
UK school uniform sizing is built around age bands (a UK 'age 8' size corresponds to a US age 6-7 on the standard chart), since UK school-wear sizes children by age and average height together rather than by a US-style numbered scale.
Because school uniform items (blazers, pinafores, trousers) are cut generously to allow for a term or two of growth, sizing to the child's current age rather than up a size is usually the manufacturer's own recommendation, unlike some other UK-to-US kids' clothing categories.
Frequently asked questions
Should I size UK school uniform up for growing room?
Most UK uniform suppliers already build growing room into the cut for a given age band, so sizing to the child's actual current age is usually the right call rather than sizing up further.