Finding the right clothing size for boys involves more than just checking the age on a clothing tag. You can get a much better fit when you check the specific measurements in a boys’ clothing size chart. A toddler and a teenager are built nothing alike.
You will notice that waist and hip measurements become much more important as they get taller. These charts and tips below will help you find the right fit for your boy through all his growth stages.
Boys’ Sizing Charts by Age
Infant Size Chart
| Category | Size | Age Range | Height (in / cm) | Weight (lb / kg) | Chest (in / cm) |
| Infant | 0-3M | 0–3 Months | 20.5–24 in / 52–61 cm | 8–12 lbs / 3.6–5.4 kg | 15.5–17 in / 39–43 cm |
| 3-6M | 3–6 Months | 24–27 in / 61–68.5 cm | 12–16 lbs / 5.4–7.3 kg | 17–18 in / 43–45.5 cm | |
| 6-9M | 6–9 Months | 27–29 in / 68.5–73.5 cm | 16–20 lbs / 7.3–9.1 kg | 18–18.5 in / 45.5–47 cm | |
| 12M | 9–12 Months | 29–30 in / 73.5–76 cm | 18–22 lbs / 8.2–10 kg | 18.5–19 in / 47–48 cm | |
| 18M | 12–18 Months | 30.5–33 in / 77.5–84 cm | 22–26 lbs / 10–11.8 kg | 19–20 in / 48–51 cm | |
| 24M | 18–24 Months | 33–35 in / 84–89 cm | 26–30 lbs / 11.8–13.6 kg | 20–21 in / 51–53 cm |
Toddler Size Chart
| Category | Size | Age Range | Height (in / cm) | Weight (lb / kg) | Chest (in / cm) | Waist (in / cm) |
| Toddler | 2T | 2 Years | 33–35 in / 84–89 cm | 29–33 lbs / 13–15 kg | 20–21 in / 51–53 cm | 20.5–21.5 in / 52–55 cm |
| 3T | 3 Years | 35.1–38 in / 89.1–96.5 cm | 33.1–36 lbs / 15.1–16.3 kg | 20.5–21.5 in / 52–55 cm | 21–22 in / 53–56 cm | |
| 4T | 4 Years | 38.1–41 in / 96.6–104 cm | 36.1–39 lbs / 16.4–17.7 kg | 21.5–22.5 in / 55–57 cm | 21.5–22.5 in / 55–57 cm |
Little Boys, Youth & Teen Size Chart
| Category | Alpha Size | Size Label | Height (in / cm) | Chest (in / cm) | Waist (in / cm) | Hips (in / cm) |
| Little Boys | XS | 4 | 41.1–43 in / 104.5–109 cm | 22–23 in / 56–58 cm | 21–21.5 in / 53–55 cm | 23–24 in / 58–61 cm |
| S | Slim 5 | 43.1–45 in / 109.5–114 cm | 23 in / 58 cm | 20.5 in / 52 cm | 23 in / 58 cm | |
| 5 | 43.1–45 in / 109.5–114 cm | 23–24 in / 58–61 cm | 21.5–22 in / 55–56 cm | 24–25 in / 61–64 cm | ||
| S | Slim 6 | 45.1–47.5 in / 114.5–121 cm | 24 in / 61 cm | 21 in / 53 cm | 24.5 in / 62 cm | |
| 6 | 45.1–47.5 in / 114.5–121 cm | 24–25 in / 61–64 cm | 22.5–23 in / 57–58 cm | 25.5–26.5 in / 65–67 cm | ||
| S | Slim 7 | 47.6–50 in / 121–127 cm | 25.5 in / 65 cm | 21.5 in / 55 cm | 25.5 in / 65 cm | |
| M | 7 | 47.6–50 in / 121–127 cm | 25.5–26.5 in / 65–67 cm | 23–23.5 in / 58–60 cm | 26.5–27.5 in / 67–70 cm | |
| Youth | M | Slim 8 | 50.1–53 in / 127–135 cm | 26.5 in / 67 cm | 22 in / 56 cm | 26 in / 66 cm |
| 8 | 50.1–53 in / 127–135 cm | 26.5–27.5 in / 67–70 cm | 24–24.5 in / 61–62 cm | 27.5–28.5 in / 70–72 cm | ||
| Husky 8 | 50.1–53 in / 127–135 cm | 28.5 in / 72 cm | 27 in / 69 cm | 30.5 in / 77 cm | ||
| M/L | Slim 10 | 54–57 in / 137–145 cm | 28 in / 71 cm | 23 in / 58 cm | 28 in / 71 cm | |
| 10 | 54–57 in / 137–145 cm | 28–29.5 in / 71–75 cm | 25–25.5 in / 64–65 cm | 29.5–30.5 in / 75–77 cm | ||
| Husky 10 | 54–57 in / 137–145 cm | 30.5 in / 77 cm | 28.5 in / 72 cm | 32.5 in / 83 cm | ||
| L | Slim 12 | 57.1–60 in / 145–152 cm | 29.5 in / 75 cm | 24 in / 61 cm | 29.5 in / 75 cm | |
| 12 | 57.1–60 in / 145–152 cm | 29.5–31.5 in / 75–80 cm | 25.5–27 in / 65–69 cm | 31–33 in / 79–84 cm | ||
| Husky 12 | 57.1–60 in / 145–152 cm | 32.5 in / 83 cm | 30.5 in / 77 cm | 34.5 in / 88 cm | ||
| Teen | XL | Slim 14 | 60.1–63 in / 153–160 cm | 31 in / 79 cm | 25.5 in / 65 cm | 31.5 in / 80 cm |
| 14 | 60.1–63 in / 153–160 cm | 31.5–33.5 in / 80–85 cm | 27–29 in / 69–74 cm | 33–35 in / 84–89 cm | ||
| Husky 14 | 60.1–63 in / 153–160 cm | 34.5 in / 88 cm | 32 in / 81 cm | 36 in / 91 cm | ||
| XL/XXL | Slim 16 | 63.1–66 in / 160–168 cm | 33 in / 84 cm | 27 in / 69 cm | 33.5 in / 85 cm | |
| 16 | 63.1–66 in / 160–168 cm | 33.5–35.5 in / 85–90 cm | 29–31 in / 74–79 cm | 35–37 in / 89–94 cm | ||
| Husky 16 | 63.1–66 in / 160–168 cm | 36.5 in / 93 cm | 34 in / 86 cm | 38 in / 97 cm | ||
| XXL | 18 | 66.1–68 in / 168–173 cm | 35.5–37.5 in / 90–95 cm | 31–32.5 in / 79–83 cm | 37–39 in / 94–99 cm | |
| Husky 18 | 66.1–68 in / 168–173 cm | 38.5 in / 98 cm | 35.5 in / 90 cm | 40 in / 102 cm |
Boys’ Sizing Charts by Clothing Type
Tops (Shirts, Hoodies, Jackets)
| Size Group | Age Range | Measurement Focus | Chest Range (in / cm) |
| Infant/Toddler | 0–4 Years | Overall Height & Weight | 15.5–23 in / 39–58.5 cm |
| Little Boys | 4–7 Years | Chest & Arm Length | 23–27 in / 58.5–68.5 cm |
| Youth | 8–12 Years | Shoulder Width & Chest | 27–33 in / 68.5–84 cm |
| Teen | 14–18 Years | Torso Length & Chest | 33–39.5 in / 84–100 cm |
Bottoms (Pants, Shorts, Jeans)
| Size Group | Age Range | Measurement Focus | Waist Range (in / cm) | Inseam (in / cm) |
| Infant & Toddler | 0–4 Years | Seat Room & Diaper Fit | 15.5–22.5 in / 39–57 cm | 8–17 in / 20–43 cm |
| Little Boys | 4–7 Years | Waist & Hip Ratio | 21–24 in / 53–61 cm | 17–22.5 in / 43–57 cm |
| Youth | 8–12 Years | Waist Comfort & Inseam | 24–31 in / 61–79 cm | 22.5–28 in / 57–71 cm |
| Teen | 14–18 Years | Rise & Total Length | 31–37 in / 79–94 cm | 28–32 in / 71–81.5 cm |
You can also find the right sizing for the rest of your kids by visiting our other guides. Check out our sizing charts for girls as well as the clothing sizing chart for kids to help you shop for siblings with confidence.
FAQs
What are Boy Sizes in Clothes?
Boy clothes use growth stages to help you find a better fit. You have infants (0-24M) and toddlers (2T-4T), then bigger groups like little boys (4-7), youth (8-12), and teens (14-18). These stages help you move away from just checking height or weight. You can get a much more precise fit by looking at chest, waist, and hip measurements instead.
What Size is 10 to 12 for Boys?
A size 10 to 12 for boys, is usually for the preteens who are about 54 to 60 inches tall. This is a stage where boys start getting longer legs and a taller torso. It is that stage right before they hit their teen years. Looking at these actual numbers is how you make sure the clothes will still fit while they grow so fast.
Is a 10-12 a Youth Medium or Large?
Size 12 is almost always a Youth Large. Size 10 often acts as a bridge (M/L) depending on the brand. Because boys grow so fast at this stage, moving to a Large is usually the safer bet for longevity.
What Age is Size XL for Boys?
An XL usually fits boys between 13 and 14 years old, covering numeric sizes 14 or 16. It is the final standard size in most kids’ clothing lines before they transition into larger teen sizes or men’s sizes.
Final Words
These charts use standardized industry numbers, but every boy grows differently. Use the Boys’ Clothing Size Chart and the tips above as an indication to find the right size before you shop. Checking these numbers now helps you avoid the headache of returns later.
For clothes that look great and fit even better, check out Siukid. They make durable and stylish gear that stays comfortable through every growth spurt and afternoon of rough play. Now he will actually want to wear what is in his closet.
