How Much Does a Tennis Ball Weigh? Official Specs Explained
A standard tennis ball must weigh between 56.0 g and 59.4 g (1.975–2.095 oz) according to ITF regulations. It must also meet strict diameter and bounce requirements to be approved for professional play.
A tennis ball must weigh between 56.0 g and 59.4 g (1.975–2.095 oz) under ITF Rules of Tennis. This narrow range is strictly enforced for professional and sanctioned competition. The ball must also fall within a defined diameter range and meet precise bounce standards on a concrete surface.
Official ITF Ball Specifications
| Property | Minimum | Maximum |
|---|---|---|
| Weight | 56.0 g (1.975 oz) | 59.4 g (2.095 oz) |
| Diameter | 6.54 cm (2.57 in) | 6.86 cm (2.70 in) |
| Bounce (dropped from 254 cm) | 135 cm | 147 cm |
| Deformation (forward) | 0.56 cm | 0.74 cm |
| Deformation (return) | 0.74 cm | 0.97 cm |
These specifications apply to balls used in ITF-sanctioned events. Manufacturers must submit balls for testing and approval before they can be used in official competition.
Types of Approved Tennis Balls
The ITF classifies approved balls into different types based on internal pressure and felt:
| Type | Description | Common Use |
|---|---|---|
| Type 1 (Fast) | Slightly smaller, lower felt | Slow surfaces (clay) |
| Type 2 (Medium) | Standard ball | Medium-pace hard courts |
| Type 3 (Slow) | Larger diameter | Fast surfaces (grass, indoor) |
| High-altitude ball | Lower internal pressure | Venues above ~1,219 m / 4,000 ft |
High-altitude balls are necessary because thinner air at elevation allows a standard ball to travel faster and bounce differently. Tournaments in cities like Mexico City, Bogotá, or Johannesburg typically use high-altitude approved balls.
Why Weight Matters
The weight of a tennis ball affects:
- Ball speed off the strings. A heavier ball within the allowed range hits the string bed with more mass, which influences both pace and the physical load on a player’s arm.
- Bounce consistency. Weight and internal pressure together determine how the ball interacts with the court surface.
- Serve and groundstroke dynamics. Even small differences in mass affect spin generation and the feel of heavy topspin groundstrokes.
For recreational players, these differences are barely perceptible. At professional level, players can often feel differences in ball weight and pressure between brands or batches.
How Balls Change During a Match
New balls are harder and faster. As a match progresses, the felt on the ball flattens, making the ball slightly heavier due to absorbed moisture and slower through the air due to increased aerodynamic drag from worn felt. Grand Slam tournaments typically change balls every 9 games (after the first 7 games of the match).
Pressureless vs. Pressurised Balls
Pressurised balls — the standard for competition — lose internal pressure over time once removed from their sealed can, which is why they come in pressurised tubes. Pressureless balls (used in training machines and recreational settings) rely on the rubber itself for bounce and do not deflate, but they tend to feel heavier and are not used in competition.
Quick summary: A regulation tennis ball weighs between 56.0 g and 59.4 g and measures 6.54–6.86 cm in diameter. These specs are set by the ITF and are non-negotiable for sanctioned competition. Balls also come in different types suited to different surfaces and altitudes.
Frequently asked questions
What is the official weight of a tennis ball?+
According to ITF Rules of Tennis, a tennis ball must weigh between 56.0 g and 59.4 g (approximately 1.975 to 2.095 ounces).
What is the diameter of a tennis ball?+
An ITF-approved tennis ball must have a diameter between 6.54 cm and 6.86 cm (approximately 2.57 to 2.70 inches).
Why do tennis balls come in different types?+
Tennis balls are made in different pressures and felt textures to suit different altitudes and court surfaces. High-altitude balls have lower internal pressure to compensate for thinner air. Slower balls are used on fast surfaces to balance the game.