How Heavy Is a Basketball? Weight by League, Age and Training Use

How heavy is a basketball? An official NBA ball is reported at about 22 ounces, or roughly 1.4 pounds. Lighter balls are reported for the WNBA and for youth play. The full breakdown by league follows below.

How Heavy Is a Basketball at the NBA Level?

Pages on this topic most often lead with the NBA basketball weight, and it is the figure most readers want to compare against.

An official NBA basketball is reported at about 22 ounces, close to 1.4 pounds, with a circumference of 29.5 inches. Converted, 22 ounces comes to roughly 624 grams. The standard material is reported as leather.

The sources behind these figures are commercial websites, and none of them points to a rulebook.

The numbers work as a general guide but not as a replacement for the current official specification, which anyone buying for league play should check with the governing body.

The NBA figure is also given as one approximate value, while other levels get ranges, and the sources do not explain why.

Also Read: Gamegistics

Basketball Weight by League and Level

The table below collects the reported figures. The gram values are calculated from the ounce values and rounded, so they are conversions and not source figures. Where a source gives no value, the cell says not stated.

Weight and Size Comparison Table

The gap between the heaviest and lightest ball in the table is 8 ounces, or about 227 grams.

Notes on Each Level

The NBA

The NBA figure is the most firmly stated of the group, tied to a 29.5 inch circumference. No tolerance is given, so it is unclear how much an individual ball may vary.

NCAA and FIBA

Both are reported at the same range, 20 to 22 ounces. The NCAA circumference is reported as about 29 inches.

The sources do not say whether the NCAA figure applies to both men and women, and no circumference is given for FIBA, so this guide leaves it blank rather than guess.

The WNBA

The WNBA basketball weight is lower than the NBA figure. According to the WNBA rule book, the official ball weighs between 18 and 20 ounces, with a circumference between 28.5 and 29 inches.

One commercial source describes this as a more manageable size and weight for the athletes in that league, with no study cited.

How Heavy Is a Basketball for Youth Players?

Youth basketball weight is reported at 14 to 16 ounces, with circumferences between 27.25 and 27.75 inches. The sources describe these balls as easier for small hands to grip.

They treat youth as one bracket and do not separate ages or ball sizes. In practice, buyers for younger players often start from the size label on the ball and the rules of the league, since a single youth range covers a wide span of ages.

Basketball Weight in Grams and Kilograms

None of the competing pages gives metric figures, which leaves a gap, since readers outside the United States commonly see ball listings in grams.

How the Conversions Were Calculated

The grams in this guide are based on data from NIST, which puts one ounce at about 28.35 grams, rounded to the nearest whole gram. By that arithmetic, the NBA figure of 22 ounces is about 624 grams, or 0.62 kilograms.

The heaviest training balls discussed later, at 4 pounds, work out to about 1.8 kilograms.

Why Basketball Weight Is Specified

Consistency Across Competition

The weight of a basketball is specified so that the contest stays level and results reflect player skill and not equipment differences.

That reasoning is general and plausible, though the pages offer no measurement or study behind it. Organized leagues in most sports standardize equipment this way.

Effect on Handling

One source describes a ball that is too heavy as harder to handle and shoot, and a ball that is too light as bouncing less predictably. This is general understanding, not a measured result.

Other claims about wind or season durability appear in some sources without support and are not repeated here.

Air Pressure and Game-Ready Condition

According to the NBA rule book, the game ball must be inflated to between 7.5 and 8.5 pounds of pressure.

One commercial source adds that the pressure is checked with a small gauge through the air valve and that over or under inflation leads to erratic bounce.

Anyone who plays regularly tends to notice an underinflated ball quickly, since the bounce changes first.

Weighted Basketballs

Typical Weights

A weighted basketball, sometimes called a heavy trainer, is a separate product from a game ball. One source reports a range of 2.8 to 4 pounds, which is about 1.3 to 1.8 kilograms.

A product page from a training equipment maker lists one model at 3 pounds, or about 1.4 kilograms. The sources describe these balls as similar in size to a regular ball.

One source calls 2.8 pounds twice the weight of a conventional ball while also describing the difference as not drastic, and those two statements pull in different directions.

Against the NBA figure of about 1.4 pounds, a 2.8 pound ball is double and a 4 pound ball is a little under three times as heavy.

What Coaches Say They Are Used For

Two college coaches quoted in one article describe weighted balls as useful for passing and ball handling drills, often early in practice.

One coach does not recommend them for shooting practice, and one advises beginners to learn fundamentals first. Both say regular use matters more than exact timing.

In practice, coaches who use heavy trainers tend to treat them as one tool among several, a view the quoted coaches themselves share.

Limits of the Evidence

The skill benefits come from coach opinion and from product marketing. The sources present no measurements, and the product page lists strength and ball control benefits as facts without support.

Its feature list also uses lightweight wording for a 3 pound ball, so those lines are not relied on here.

Readers weighing a purchase should treat the benefits as plausible and widely reported by coaches, but not established by the pages reviewed.

Reported Figures and General Understanding

The pages reviewed were published or last updated in 2023, and this guide was reviewed in 2026. Specifications can change between seasons, so figures should be checked against the current rules of each governing body before they are relied on for anything official.

Conclusion

An official NBA basketball is reported at about 22 ounces, with lighter balls reported for the WNBA and youth play.

Weighted trainers run about 2.8 to 4 pounds and are a separate product. All figures here come from third party sources, so check official rules before relying on them.

Frequently Asked Questions

How much does an NBA basketball weigh?

An NBA basketball is reported at about 22 ounces, close to 1.4 pounds or roughly 624 grams. The circumference is reported as 29.5 inches. These figures come from third party sources and are worth checking against the current official rules.

Is a WNBA basketball lighter than an NBA basketball?

Yes, according to the sources reviewed. The WNBA ball weighs 18 to 20 ounces with a circumference of 28.5 to 29 inches, compared with about 22 ounces and 29.5 inches for the NBA.

How much does a basketball weigh in grams?

Using about 28.35 grams per ounce, a 22 ounce NBA ball is roughly 624 grams. A 20 ounce ball is about 567 grams, and an 18 ounce ball is about 510 grams. These are rounded conversions.

How heavy is a youth basketball?

Youth balls are reported at 14 to 16 ounces, or about 397 to 454 grams, with circumferences of 27.25 to 27.75 inches. The sources do not break this down by age, so check the size label or league rules.

How heavy is a weighted basketball?

Weighted trainers are reported at 2.8 to 4 pounds, or about 1.3 to 1.8 kilograms, with one product listed at 3 pounds. That is double or more the weight of a standard NBA ball.