Baseball
73.8 mm (2.906 in)
Diameter (circumference divided by pi)
An official Major League Baseball ball, red stitches and all. About 7.4 cm across (9 to 9¼ inches around).
Published
How big is that?
73.8 mm is 25% of an A4 sheet.
Baseball is the 11th smallest of the 39 Classic objects, and the 11th 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: Baseball in orange beside the Classic objects nearest in size, in teal.
| Object | Size | vs Baseball |
|---|---|---|
| Rubik's Cube (3 x 3)The original six-color twisty puzzle. | 57 mm | 77% of the size |
| Tennis ballA regulation ball for professional tennis. | 67 mm across | 91% of the size |
| Baseball | 73.8 mm across | – |
| Credit card (ID-1 size)A standard bank card, the same size as most ID and loyalty cards. | 85.6 mm | 1.2× bigger |
| Golf holeThe cup on a putting green, seen from above with the flagstick in the middle. | 10.8 cm across | 1.5× bigger |
In other units
| Millimetres | 73.8 |
|---|---|
| Centimetres | 7.38 |
| Metres | 0.0738 |
| Inches | 2.906 |
| Feet | 0.2421 |
How it's measured
Diameter (circumference divided by pi). Midpoint of the MLB circumference range, 9 to 9¼ in (7.28-7.48 cm across).
The source gives a range, so this is the middle of it.
Sources
- mktg.mlbstatic.com: Official Baseball Rules 2026, Rule 3.01: not less than nine nor more than 9¼ inches in circumference.
Checked against the source on .
Could you have guessed it by eye?
Baseball 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.