Size guide
Senston size guide: balls and rackets by age
Three tables cover most questions: basketball size by age, soccer ball size by age group and tennis racket length by age. Each one names its source.
What size basketball for what age?
Size 5 for ages 7–8, size 6 for ages 9–11, then size 6 for girls and size 7 for boys from age 12. See the Senston basketballs.
| Age | Ball | Circumference |
|---|---|---|
| Ages 7–8 | Size 5 | 27.5 in |
| Ages 9–11 | Size 6 | 28.5 in |
| Ages 12–14, girls | Size 6 | 28.5 in |
| Ages 12–14, boys | Size 7 | 29.5 in |
| Grades 9–12, girls | Size 6 | 28.5 in |
| Grades 9–12, boys | Size 7 | 29.5 in |
Source: USA Basketball, Youth Basketball Guidelines, read October 28, 2026.
What size soccer ball for what age?
A #3 ball for 8 and under, a #4 for 10 to 12 and under and a #5 from 13 and under up. See the Senston soccer balls.
| Age group | Ball | Circumference | Weight |
|---|---|---|---|
| 6 and under, 8 and under | #3 | 23–24 in | 11–12 oz |
| 10 and under, 11 and 12 and under | #4 | 25–26 in | 11–13 oz |
| 13 and under to 19 and under | #5 | 27–28 in | 14–16 oz |
Source: US Youth Soccer, Policy on Players and Playing Rules, June 23, 2026, read October 28, 2026.
What racket length for what age?
19 to 23 inches for 8 and under, 23 or 25 inches for ages 9–10, and 27 inches on a full court. Senston rackets come in 17, 19, 23, 25, 27 inches: see Senston tennis.
| Age | Racket length |
|---|---|
| 8 and under | 19, 21 or 23 in |
| 9–10 | 23 or 25 in |
| Moving to the 78-foot court | 26 in |
| All ages on a full court | 27 in |
Source: USTA, Pick the Right Racquet, read October 28, 2026.
Volleyballs, footballs and badminton
A game volleyball is 65–67 cm around and weighs 260–280 g by the FIVB rules. Footballs come in junior size 6 and official size 9, and Senston badminton rackets run 76 to 95 grams. The ball size guide and the badminton and ping pong guide go further.