Most 10 year olds wear a youth medium or youth large in t-shirts. The exact size depends on their height and chest measurement, not just their age. A 10 year old who is 4 foot 6 and lean needs youth medium. A 10 year old who is 4 foot 10 and solid needs youth large.
Shirt Sizes for 10 Year Olds by Brand
| Brand | Youth Medium Chest (in) | Youth Large Chest (in) | Best Fit for Average 10yr |
|---|---|---|---|
| Gildan | 30-32 | 32-34 | Youth Medium |
| Bella+Canvas | 28-30 | 30-32 | Youth Large |
| Comfort Colors | 30-32 | 32-34 | Youth Medium |
| Next Level | 28-30 | 30-32 | Youth Large |
| Hanes | 30-32 | 32-34 | Youth Medium |
Notice that the brand changes the recommendation. An average 10 year old with a 30-inch chest fits comfortably in Gildan youth medium but needs a youth large in Bella+Canvas because Bella+Canvas runs slimmer. Always check the specific brand's chart rather than assuming all youth mediums are the same.
Who Fits What at Age 10
The average 10 year old in the United States is about 4 foot 7 and weighs around 70 pounds. That puts most of them solidly in the youth medium range for brands like Gildan and Hanes.
But "average" covers a wide range. Here is a breakdown by body type:
Lean and tall for their age (4'8" to 5'0", under 65 lbs): Youth medium in Gildan or Hanes. Youth large in Bella+Canvas or Next Level. The length will be right and the chest will not be swimming.
Average build (4'5" to 4'9", 60 to 80 lbs): Youth medium in most brands. This is the sweet spot where standard sizing works.
Stocky or athletic build (4'5" to 4'9", over 80 lbs): Youth large across the board. The extra chest width prevents the shirt from pulling across the torso.
Which Size to Order
If you cannot measure the child, youth medium is the safest bet for a 10 year old in Gildan or Hanes. It fits the widest range of builds at that age.
If you are ordering for a team and need to cover multiple 10 year olds without measuring each one, order a mix of youth medium and youth large. Most youth teams in the 10 year old range split about 60/40 between medium and large. Our guide on how many shirts to order for a team breaks down the exact formula.
If the shirt is a gift and you want to make sure it fits for more than a few months, size up. A slightly oversized youth large on a 10 year old today becomes a perfect fit six months from now.
When to Move to Youth Large or XL
If youth medium is getting tight across the chest or riding up above the waistband, it is time to move up. Youth large adds about 2 inches in the chest and 1 inch in body length. That is usually enough to cover the next growth spurt.
For a detailed look at the larger youth sizes and how they compare to adult sizing, check our What Size Is Youth Large guide and our Youth XL vs Adult Small comparison.
What size shirt does a 10 year old wear?
Most 10 year olds wear youth medium in Gildan, Hanes, and Comfort Colors. In Bella+Canvas and Next Level, which run slimmer, they may need youth large. The best indicator is chest measurement, not age. Measure across the chest from armpit to armpit and double it, then compare to the brand's size chart.
Is a 10 year old youth medium or large?
It depends on the brand and the child's build. An average-sized 10 year old with a 30-inch chest fits youth medium in most brands. A larger 10 year old with a chest over 32 inches needs youth large. Slim-fit brands like Bella+Canvas may require sizing up.
What size is a 10 year old in adult shirts?
A 10 year old is typically not ready for adult sizing. Adult XS starts at 30 to 32 inches in the chest but the body length and shoulder width are designed for adult proportions. Youth medium or large is the correct category for a 10 year old. The jump to adult sizing usually happens around ages 14 to 16. See our Is Youth XL the Same as Adult Small guide for when that transition makes sense.
Related Sizing Guides
- What Size Shirt for an 8 Year Old?
- What Size Shirt for a 12 Year Old?
- What Size Shirt for a 6 Year Old?
- What Size Is Youth Medium?
- What Size Is Youth Large?
- Gildan Youth Sizing Guide
- Bella Canvas Youth Sizing Guide
- Custom Team Shirt Sizing Guide for Coaches
Ordering Shirts for a Youth Team or Group?
If you are a coach, parent, or event organizer ordering shirts for a group of 10 year olds, we will help you get the sizing right so nobody ends up in a shirt that does not fit. Start your order here and let us know the age range. We will recommend the right size split.