Youth Size Chart: YXS to YXL, Kids to Adult Size Conversion
Youth size chart for YXS, YS, YM, YL and YXL with age, height, weight, chest, waist and adult crossover notes.
Youth size chart: YXS to YXL
Youth alpha labels bridge little kid sizes and adult XS/S sizing.
| Youth label | Approx age | Weight | Height | Chest | Waist |
|---|---|---|---|---|---|
| YXS / 4-5 | 4-5 years | 39-49 lb / 18-22 kg | 40-45 in / 102-114 cm | 22-24 in / 56-61 cm | 21-22 in / 53-56 cm |
| YS / 6-7 | 6-7 years | 49-58 lb / 22-26 kg | 45-50 in / 114-127 cm | 24-26 in / 61-66 cm | 22-23 in / 56-58 cm |
| YM / 8-10 | 8-10 years | 58-80 lb / 26-36 kg | 50-56 in / 127-142 cm | 26-29 in / 66-74 cm | 23-25 in / 58-64 cm |
| YL / 12-14 | 11-13 years | 80-115 lb / 36-52 kg | 56-64 in / 142-163 cm | 29-33 in / 74-84 cm | 25-27 in / 64-69 cm |
| YXL / 16-18 | 13+ years | 115-140 lb / 52-64 kg | 64-69 in / 163-175 cm | 33-36 in / 84-91 cm | 27-30 in / 69-76 cm |
Teens may need adult sizes for height or length before chest and waist measurements fully match adult charts.
Age to clothing size chart
Use age as a quick entry point, then verify by height and weight.
| Age | Common size | Weight | Height | Best check |
|---|---|---|---|---|
| 0-3 months | 0-3M | 8-12 lb / 3.6-5.4 kg | 21-24 in / 53-61 cm | Use length for sleepers |
| 6 months | 3-6M or 6M | 12-17 lb / 5.4-7.7 kg | 24-27 in / 61-69 cm | Size up if near top of range |
| 12 months | 9-12M or 12M | 21-25 lb / 9.5-11.3 kg | 29-31 in / 74-79 cm | Check diaper room |
| 2 years | 2T | 28-32 lb / 13-15 kg | 33-35 in / 84-89 cm | Toddler cut |
| 3 years | 3T | 32-35 lb / 15-16 kg | 35-38 in / 89-97 cm | Toddler cut |
| 4-5 years | 4T, 4 or 5 | 35-49 lb / 16-22 kg | 38-45 in / 97-114 cm | 2T-5T to kid sizes transition |
| 6-7 years | 6-7 / YS | 49-58 lb / 22-26 kg | 45-50 in / 114-127 cm | Little kid range |
| 8-10 years | 8-10 / YM | 58-80 lb / 26-36 kg | 50-56 in / 127-142 cm | Youth medium range |
| 11-13 years | 12-14 / YL | 80-115 lb / 36-52 kg | 56-64 in / 142-163 cm | Youth to adult crossover |
Age is the least reliable measurement for children. Height is usually the fastest way to improve accuracy.
How to measure before choosing a size
Related size charts
More in Kids & Baby
Kids Size Chart
Parents usually want to translate age into a size, but real fit depends more on height, weight, waist, and chest.
Baby Size Chart
Baby size searches usually come from parents comparing month labels with real weight and length because babies grow at very different speeds.
Toddler Size Chart
Toddler searchers often need to understand T sizing, the 24M-to-2T transition and why size 4 can fit differently from 4T.
Kids Clothing Size Chart
Kids clothing users need a combined view across baby, toddler, little kid and youth stages because children grow unevenly by age.
Kids Pants Size Chart
Kids pants searches focus on waist and length problems because kids can be tall and slim, short and sturdy, or between adjustable waist sizes.
Kids Shirt Size Chart
Kids shirt searchers need chest and height plus garment length because tops may fit around the body but become too short.
FAQ
What size is youth medium?
Youth medium is often around kids 8-10, fitting roughly 50-56 inches tall with a 26-29 inch chest.
Is youth XL the same as adult small?
It can overlap, but adult small may be longer and broader. Compare garment measurements.
Should teens use youth or adult sizes?
Use youth if chest and waist fit; use adult sizing when height, sleeve or inseam length is the limiting measurement.