WNBA Ball Size vs the NBA

A WNBA basketball measures 28.5 inches in circumference, which is a size 6 ball, while an NBA basketball is 29.5 inches, a size 7. That makes the WNBA ball one inch smaller in circumference and slightly lighter than the NBA’s, the single most important difference between the two leagues’ basketballs.

It is a small gap, but a meaningful one, and it is often misunderstood. Here is exactly how the two balls compare, why the WNBA uses the smaller size, and what stays the same between the leagues.

The core numbers

The difference comes down to one inch of circumference and a small amount of weight.

Element	WNBA ball	NBA ball
Size designation	Size 6	Size 7
Circumference	28.5 inches	29.5 inches
Weight	Slightly lighter	Slightly heavier
Material	Standard basketball leather/composite	Standard basketball leather/composite
Used elsewhere	NCAA women, international women’s basketball	NCAA men, most men’s basketball

Reading across, only the size and weight change, everything else about the ball is essentially identical. The WNBA’s size 6 is the standard women’s basketball; the NBA’s size 7 is the standard men’s ball.

Why the WNBA uses a smaller ball

The size 6 ball is not a WNBA quirk, it is the universal standard across women’s basketball, including college (NCAA) and international competition. The reasoning is about grip and control. A slightly smaller, lighter ball suits the average hand size in the women’s game, making it easier to palm, dribble, pass and shoot with precision.

That extra control supports the skillful, fast-paced style the women’s game is known for. Because the standard is consistent from the college level up to the pros and internationally, players use the same size ball throughout their careers, with no jarring adjustment when they turn professional.

One inch, real effect

An inch of circumference sounds trivial, but ball size genuinely shapes how the game feels. A smaller ball is easier to handle for tight ballhandling and quick releases, and the shooting touch a player develops is calibrated to that specific size. This is why players are so particular about the ball they use, muscle memory is built around its exact dimensions.

It is the same principle you see across sports, where equipment is tuned to the athletes and the game. Our look at soccer ball weight and pressure shows how another sport obsesses over the precise specs of its ball, and how small changes affect play.

What is the same between the leagues

It is worth stressing how much the two balls have in common, because the size difference is often exaggerated. Both use the same materials and construction, both are inflated to the same kind of pressure, and both are used in fundamentally the same way, dribbled, passed and shot at a 10-foot rim. The rim height, the ball’s basic design and the way the game is played at the rim are all shared.

In other words, a WNBA ball is not a different kind of basketball, it is the same ball, one inch smaller. If you handed a casual fan both balls, the difference would be subtle in the hand and invisible from the stands.

How ball size fits the wider WNBA game

The ball is one of several ways the WNBA is tailored to the women’s game rather than simply copied from the NBA. The three-point line is set at a shorter distance than the NBA’s, in line with international and college dimensions, and the game itself runs for a different length. Our guide to how long WNBA games are covers the 40-minute format, eight minutes shorter than the NBA’s, another example of the league following the women’s-basketball standard rather than the NBA’s.

Together these choices give the WNBA its own identity, consistent with basketball played by women everywhere, from college arenas to the Olympics. For more on the league itself, our overview of WNBA salaries covers the business side of the women’s game, and the shot clock in basketball explains a timing rule the leagues share.

The short version

A WNBA basketball is 28.5 inches in circumference, a size 6, while an NBA ball is 29.5 inches, a size 7, so the WNBA ball is one inch smaller and slightly lighter. The size 6 is the universal women’s-basketball standard, chosen to suit hand size and improve grip and control. Beyond that one inch, the two balls, and the way they are used, are essentially the same.