Basketball (Size 7)
24.19 cm (9.524 in)
Diameter
The ball used in men's professional basketball. Diameter: about 24.2 cm.
Published
How big is that?
24.19 cm is 2.8 times a credit card and 81% of an A4 sheet.
Basketball is the 17th smallest of the 39 Classic objects, and the 17th smallest of the 109 objects across all three SizeItUp games.
Closest in size from the other games: Archaeopteryx (Prehistoric Giants), 50 cm long.
Size comparison
To scale, smallest to largest: Basketball in orange beside the Classic objects nearest in size, in teal.
| Object | Size | vs Basketball |
|---|---|---|
| Bowling ball (Ten-pin)A ten-pin bowling ball with its three finger holes. | 21.83 cm across | 90% of the size |
| Football (Size 5)The ball used in adult association football. | 21.96 cm across | 91% of the size |
| Basketball (Size 7) | 24.19 cm across | – |
| Letter paper (US Letter)A standard North American sheet of printer paper, measured along its long side. | 27.94 cm | 1.2× bigger |
| A4 sheet of paper (Portrait)The standard office paper size used across most of the world. | 29.7 cm | 1.2× bigger |
In other units
| Millimetres | 241.9 |
|---|---|
| Centimetres | 24.19 |
| Metres | 0.2419 |
| Inches | 9.524 |
| Feet | 0.7936 |
How it's measured
Diameter. Derived from the midpoint of the FIBA circumference range: 760 mm / pi = 24.19 cm.
The source gives a range, so this is the middle of it.
Sources
- assets.fiba.basketball: FIBA Official Basketball Rules 2026, Equipment, Table 1: size 7 circumference 750-770 mm.
Checked against the source on .
Could you have guessed it by eye?
Basketball is one of the objects in Classic, a daily size comparison game: you stretch a shape to the size you think is right beside one you know.