High school boys throw a 1.6 kg discus. Girls throw 1 kg. Those two numbers come from NFHS Rule 6-10-4, and they hold at every meet run under the NFHS book, from a Tuesday dual to the state final. What confuses people is the levels on either side. Middle school weight is set locally rather than nationally, and college jumps to 2 kg on day one. The level-by-level chart, youth through masters, is in discus weight by age.
NFHS writes rules for grades 9 through 12. Nobody writes a national middle school discus rule, so the weight comes from your state association, your league, or the meet director. In practice nearly everyone uses the 1 kg disc for boys and girls, which matches USATF's 11-12 and 13-14 divisions. Read the meet information before you buy anything. The shot put has the same gap in national coverage, covered in high school shot put weight.
A senior who throws 170 feet with the 1.6 kg disc is not throwing 170 feet as a college freshman. The NCAA implement is 25% heavier. Coaches commonly budget a drop of roughly 15 to 20% in distance through that first season, narrowing as strength and timing catch up. Treat that as a planning rule of thumb, not a conversion factor. Shot putters face a comparable step in the same autumn, described in the college shot put step.
World Athletics puts U18 men on 1.5 kg and U20 men on 1.75 kg. So a US high school junior on 1.6 kg is throwing heavier than a same-age athlete at a World U18 Championship and lighter than an American 18-year-old at a U20 meet. Marks across those three implements do not compare, and anyone quoting them side by side is comparing different events.
When a thrower moves up a weight, the throw usually breaks in the same spot. The left side gives out early and the disc leaves low and flat. Film one throw from behind the ring and AI shows you the frame where the block collapses, then gives you the drill that holds it.
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Legal weights, not recommendations. The right-hand column tracks what changes for boys, since the girls' weight is 1 kg at every level on this list.
| Level | Boys / Men | Girls / Women | Change for boys |
|---|---|---|---|
| USATF 11-12 | 1 kg (2.20 lb) | 1 kg (2.20 lb) | First legal discus |
| USATF 13-14 (U14) | 1 kg (2.20 lb) | 1 kg (2.20 lb) | No change |
| Middle school, typical league rule | 1 kg (2.20 lb) | 1 kg (2.20 lb) | Set locally, not by NFHS |
| High school, NFHS grades 9-12 | 1.6 kg (3.53 lb) | 1 kg (2.20 lb) | 60% heavier than 1 kg |
| USATF 15-16 and 17-18 | 1.6 kg (3.53 lb) | 1 kg (2.20 lb) | Matches NFHS |
| World Athletics U18 | 1.5 kg (3.31 lb) | 1 kg (2.20 lb) | Lighter than the NFHS disc |
| World Athletics U20 | 1.75 kg (3.86 lb) | 1 kg (2.20 lb) | 9% heavier than 1.6 kg |
| NCAA, all three divisions | 2 kg (4.41 lb) | 1 kg (2.20 lb) | 25% heavier than 1.6 kg |
| NAIA and NJCAA | 2 kg (4.41 lb) | 1 kg (2.20 lb) | Same as NCAA |
| USATF open and World Athletics senior | 2 kg (4.41 lb) | 1 kg (2.20 lb) | No change |
Common questions athletes and coaches ask about this topic.
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