Basketball Uniform Numbering Rules Explained

A coach picking jersey numbers usually just goes with whatever the players want. For school programs that's a problem waiting to happen, because in the US, high school basketball numbers aren't actually a free choice — the National Federation of State High School Associations (NFHS) sets rules for which numbers are legal and how they have to look on the jersey.

Which Numbers Are Actually Legal

Under current NFHS rules, legal numbers are 0, 1–5, 00, and then 10–15, 20–25, 30–35, 40–45, and 50–55 — so no 6, 7, 8, or 9 as a standalone digit, and nothing above 55. A roster also can't carry both 0 and 00 at the same time. If your program has always let players wear whatever number they want, this is usually the first thing that trips up a first custom order — a favorite number turns out to not be legal for competition.

Size and Placement Rules

The back number has to be at least 6 inches tall, the front number at least 4 inches, each at least ¾ inch wide, and centered on the jersey. As of the 2024–25 season, the number can no longer be the same color as the jersey itself — it needs a solid contrasting color, with at most three colors total in the number and no more than two ¼-inch borders around it.

Why This Matters Before You Order, Not After

None of this is complicated once you know it, but finding out after a bulk order has already gone to production is expensive — a reprint or a re-run isn't a small fix. Send us your roster's number list before we lock the sample, and we'll flag anything that doesn't meet current NFHS spec so it gets caught at the sample stage, not the bulk one. Club and recreational leagues that don't fall under NFHS jurisdiction can generally use any numbers they like — this only applies to sanctioned school competition.

Basketball Uniforms Get a Quote

Source: NFHS Basketball Uniform Guide, National Federation of State High School Associations.