Basketball sizes
A size 7 basketball is 9.39 in (23.9 cm) across and 29.5 in (74.9 cm) around, weighing 22 oz (624 g).
Measurements
| Size | Circumference | Diameter | Weight | Who uses it |
|---|---|---|---|---|
| Size 7 | 29.5 in (74.9 cm) | 9.39 in (23.9 cm) | 22 oz (624 g) | Men and boys 12+, NBA and NCAA men |
| Size 6 | 28.5 in (72.4 cm) | 9.07 in (23 cm) | 20 oz (567 g) | Women and girls 12+, boys 9–11 |
| Size 5 | 27.5–27.75 in (69.9–70.5 cm) | 8.75–8.83 in (22.2–22.4 cm) | 14–17 oz (397–482 g) | Ages 9 to 11 |
What to know
Sizes are nominal; FIBA allows a small range around each. Size 6 is the official ball for women’s professional and college play.
Diameter is calculated from the official circumference (diameter = circumference ÷ π).
Questions people ask
What is the diameter of a size 7 basketball?
9.39 in (23.9 cm).
How much does a basketball weigh?
22 oz (624 g).
Related sizes
Sources and method
Imperial and metric values are converted with 1 in = 25.4 mm exactly and rounded only for display. Found a mistake? Report it and we will correct the page.