What Is the Diameter of a Basketball?

A standard NBA basketball is 9.43 to 9.51 inches in diameter, or 29 5/8 to 29 7/8 inches in circumference. It is inflated to a pressure of 7.5 to 8.5 pounds.

Other leagues have slightly different requirements for their basketballs. The diameter of a regulation WNBA basketball is 9.07 to 9.23 inches. The diameter of a FIBA basketball is 9.78 inches. NCAA basketballs must be 9.39 to 9.55 inches for men or 9.07 to 9.23 inches for women. The typical diameter of a grade-school basketball is 8.67 to 8.83 inches.

Basketballs are produced in smaller sizes for various other applications, such as children’s playthings or promotional giveaways.

Science

These Endangered Species Were Brought Back From Extinction in the Wild

World View

What Are the Different Types of Microcomputers?

Pets & Animals

Are Turtles a Good First Pet?

World View

How to Replace Your Lost Social Security Card

Science

What Moon Is It This Month? A Year-Round Glossary of Named Moons

World View

Moon Myths: Exploring Lunar Eclipse Folklore From Around the World