How Heavy is a Basketball?

In basketball, there is nothing more essential than the ball. Known as “the rock” by some, the ball to the basket in basketball is the sun which the game revolves around. They say to players who want to up their game, “to be the ball,” but to be the ball, you must first know the ball.

Beyond dribbling the ball, and getting it familiar with your hand, you should have deep knowledge of the rock. By understanding its weight you will be able to identify with the physics of the ball when you play. As well as be able to tell if a ball may be under — or overweight by inspection.

The multiple basketball leagues around the world have specialty manufactured balls which they use as their official game ball. Give this article a run through so you can tell which ball is from which league, and who produces them.

How Heavy is an NBA Basketball?

Since the official NBA rules do not list the regulation weight of each ball we must look to Spalding, and what weight they list for the official NBA game ball. From collecting listed weights from multiple Spalding re-sellers, we came up with a range of [20oz – 22oz] or [510g – 624g].

Spalding lists the ball at size 7.

How Heavy is a WNBA Basketball?

Luckily the WNBA Official Rule Book (pdf) gives the weight of regulation game balls. WNBA weigh a range of [18oz – 20oz] or [510g – 567g].

In the official rule book, Rule No. 1 Court Dimensions – Equipment, Section II Equipment:

f. (1) The ball shall be an officially approved WNBA ball with a weight not less than 18 ounces nor more than 20 ounces.

The manufacturer of the official game ball of the WNBA, Spalding, lists the ball at size 6.

How Heavy is an NCAA Basketball?

NCAA Men’s Basketball

In the 2019-2020 NCAA Men’s Basketball Rules and Interpretations (pdf), RULE 1 – Court and Equipment, Section 16. The Ball:

Art. 9. The weight of the ball shall not be less than 20 ounces nor more than 22 ounces.

Giving the official regulation range of an NCAA men’s basketball [20oz – 22oz] or [510g – 624g].

The manufacturer of the official game ball for NCAA men’s basketball is Wilson. While they don’t have an official weight listed anywhere. What we can assume is that they produce the balls as per NCAA regulations.

NCAA Women’s Basketball

In the 2019-20 and 2020-21 NCAA Women’s Basketball Rules and Interpretations (pdf), RULE 1 – Court and Equipment, Section 16. The Ball:

Art. 9. The weight of the ball shall not be less than 18 ounces nor more than 20 ounces.

Giving the official regulation range of an NCAA women’s basketball [18oz – 20oz] or [510g – 567g].

Just like the men’s ball, Wilson does not list an official weight for their game ball. Meaning we will only assume that the balls are produced to NCAA regulations once again.

How Heavy is a FIBA/Olympic Basketball?

Specifics on the regulations of a FIBA basketball can be found in their document, 2018 Official Basketball Rules | Basketball Rules & Basketball Equipment (pdf). Under section 7 Basketball:

7.4 For all men’s competitions in all categories, …the ball shall weigh no less than 567 g and no more than 650 g.

7.5 For all women’s competitions in all categories, … the ball shall weigh no less than 510 g and no more than 567 g.

Giving the official regulation range of a FIBA men’s basketball [20oz – 23oz] or [567g – 650g], and the official range for a women’s basketball [18oz – 20oz] or [510g – 567g].

Official Basketball Size Guide by Weight

Manufacturers like Spalding, Wilson, and Molten might be the producers for balls in big basketball leagues, but there are many other sporting goods companies that have their own line of basketballs. You can use the table below to compare the industry standard for sizing and weight.

Basically balls sizes 4 and 5 are used for game of players between the ages 8 to 11, while size 6 is for women’s games, and size 7 as the biggest size for men’s games.

FIBA Men’s Regulation 20oz – 23oz (567g 650g)
FIBA Women’s  Regulation 18oz – 20oz (510g 567g) 
NBA – Size 7 Regulation 22oz (624g)
NCAA Men’s – Size 7 Regulation 20oz – 22oz (510g – 624g)
NCAA Women’s – Size 6 Regulation 18oz – 20oz (510g 567g)
WNBA Official Game Ball – Size 6 Regulation 18oz – 20oz (510g 567g) 
Molten Official Game Ball of FIBA Men’s Listed – Size 7 N/A
Spalding Official Game Ball of the NBA Listed -Size 7 25.6oz – 27.2oz (725g 771g)
Wilson Official Game Ball of the NCAA  Listed – Size 7 N/A
Spalding Official Game Ball of the WNBA Listed – Size 6 N/A
Size 5 Youth Ball ages 9-11 17 oz
Size 4 Youth Ball ages 5-8 14 oz
Size 3 – “Mini Ball” Youth Ball ages 4-8 10 oz
Size 1 – “Micro Mini Ball” Youth Ball ages 2-4 8 oz

Final Words

The basketball has been cementing itself into our world culture for over 100 years. I’m excited to see how the basketball develops as our technology marches onward. The weight, feel, and bounce of a basketball is very distinct.

Whatever way the big ball manufacturers push their R&D, I’m just hyped to play the game in a time where the balls are accessible and designed towards more exciting play.

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