Baseball size
An official baseball is 2.86–2.94 in (7.3–7.5 cm) across and 9–9.25 in (22.9–23.5 cm) around, weighing 5–5.25 oz (142–149 g).
Measurements
| Size | Circumference | Diameter | Weight | Who uses it |
|---|---|---|---|---|
| Official ball | 9–9.25 in (22.9–23.5 cm) | 2.86–2.94 in (7.3–7.5 cm) | 5–5.25 oz (142–149 g) | MLB and most adult leagues |
What to know
A baseball is 9 to 9 1/4 in around and weighs 5 to 5 1/4 oz.
Diameter is calculated from the official circumference (diameter = circumference ÷ π).
Questions people ask
What is the diameter of a baseball?
2.86–2.94 in (7.3–7.5 cm).
How much does a baseball weigh?
5–5.25 oz (142–149 g).
Related sizes
Sources and method
- Official Baseball Rules 3.01
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.