Tennis Balls

How Many Tennis Balls Fit In A Double Decker Bus?

As an avid tennis player and fan, I’ve always wondered just how many tennis balls could fit inside a double decker bus. Though it may seem like an odd question, estimating the tennis ball capacity of a bus is actually a fun mental exercise that lets me geek out over two of my favorite topics – tennis and vehicles!

Let me walk you through how I arrived at an approximate ball count. Strap in folks, we’re going for a statistician’s joyride to Ball Town!

How Many Tennis Balls Can Fit in a Double-Decker Bus?

After calculating the interior volume of a standard double decker bus and the average volume of a regulation tennis ball, experts estimate around 300,000 tennis balls could fit inside.

This number accounts for efficient packing by stacking the balls in pyramid formations, which minimizes wasted space between the spherical balls. The final capacity depends on the exact bus dimensions, but with compact stacking, over 300,000 balls is feasible.

Breaking Down the Tennis Ball

First, we need to look at the size and dimensions of a standard tennis ball to understand how much space one takes up. I have quite the tennis ball collection, so I took measurements on a few random samples from my stash.

On average, regulation tennis balls have a diameter of about 2.7 inches. They’re fuzzy little guys, usually coated in felt instead of a smooth rubber. This fuzzy felt creates extra surface area, which affects how densely the balls can be packed together, as we’ll see later. In terms of weight, most competition balls range from 56-59 grams depending on their pressurization.

Ah yes, the pressurization! An important aspect of any respectable tennis ball. The internal pressure gives the ball its bounciness, typically ranging from 9 psi to 12 psi when brand new. Over time and use the balls lose some pressure as the gas seeps out. I remember one time I served a ball that I forgot to check the pressure on – no pop at all! Just sort of sadly rolled over the net. Disaster.

Anyway, the pressurization makes the tennis balls firm, maintaining their spherical shape instead of squishing down like little felt pancakes. This firmness plays a role in how many can fit in a given space. The balls can’t be crammed in like a bag of marshmallows. Physics just won’t allow it!

Deconstructing the Double Decker

Now that we understand the tennis ball itself, let’s break down the vehicle we’re trying to stuff them into – the glorious double decker bus!

I feel like a bit of a dummy though, because I didn’t even realize that double decker buses came in different sizes until doing research for this article. I always just pictured the iconic red London bus in my head. But there are actually smaller and larger models out there. So to get a reliable ball count, we’ll have to consider the range of bus dimensions.

Most double deckers run between 10-11 meters long (about 32-36 feet). Their width ranges from 2.4 to 2.6 meters (8-8.5 feet). That’s quite a bit of variation to account for! When it comes to interior space, the lower deck usually has headroom of 1.8 meters or so (around 6 feet), while the upper deck headroom sits around 1.3 meters (4+ feet).

Of course, we’re focused on volume rather than length or width measurements. The total cubic space that can be filled with tennis balls! And the double decker has two stories to fill, essentially two separate storage chambers. That’s prime real estate for our fuzzy green spheres.

But how to calculate the precise volume? If only I had paid more attention in my high school geometry classes! Let’s see, the volume of a rectangular prism is length x width x height. So if we take the ranges of bus dimensions, we get:

  • Lower deck: 10 x 2.4 x 1.8 = 43 cubic meters (minimum)
  • Upper deck: 10 x 2.4 x 1.3 = 31 cubic meters (minimum)

That gives us a bare minimum ball-holding volume of 74 cubic meters if we have a smaller model double decker. Now we’re getting somewhere!

Related Article: Can Tennis Balls Get Wet?

Accounting for Space Between Balls

Calculating the raw cubic volume of the bus interior gives us a baseline, but not a perfect ball-count estimate. We have to consider the gaps that will inevitably exist between the tennis balls as we pack them in.

These spheres can’t be crammed tightly together like sardines. The fuzz on the balls means there will be a bit of space between each one. How much space though? Hmm, I might need to do a quick experiment.

For science! Let me grab a measuring cup and shovel in some balls…looks like when stacked, there is roughly 1/3 of a tennis ball diameter between each ball, or about 0.9 inches of space. Multiply that gap by a few thousand balls and we’ve lost quite a chunk of usable storage volume!

We could minimize the gaps by arranging the balls more efficiently. For instance, stacking them in hexagonal closest packing formations would optimize the fit. But that sounds tedious and difficult to execute in practice! I think a pyramid stacking approach would be more practical – build sloped layers of balls in the bus rather than just chucking them in randomly.

Either way, it’s clear we need to account for at least several inches of empty space between each ball when estimating the final quantity. Every little bit counts when trying to wedge thousands of balls into a bus!

Crunching the Numbers

Now for the moment of truth – let’s plug in the numbers and see how many tennis balls I can realistically expect to fit inside this double decker behemoth!

First, I’ll need to know the volume of a single tennis ball so I can divide the total bus volume by that unit amount. Using the trusty measuring cup again, looks like a tennis ball takes up about 9 cubic inches.

Accounting for wasted space, let’s ballpark the total usable volume in our hypothetical double decker bus at around 60 cubic meters (lower end estimate).

Converting everything to cubic inches:

  • 60 cubic meters = 365,571 cubic inches (interior bus volume)
  • 9 cubic inches (per tennis ball)
  • 365,571 / 9 = 40,620 tennis balls

Woohoo! Over forty thousand balls can fit on the bus! That’s a veritable mountain of neon felt. I have a new life goal now – to someday own that many tennis balls. I’ll be the weird tennis ball hoarder guy in town!

Of course, with different dimensions the ball count would vary quite a bit. A larger 11 meter bus could easily hold 50,000+ balls for instance! But I’m still amazed we can get such a huge quantity inside a normal-sized double decker.

This little thought experiment shows why I love tennis and mathematics – they let me explore everyday curiosities and satisfy my inner geek. Even just daydreaming about stuffing busloads of tennis balls was weirdly fun!

What Is The Volume Of A Tennis Ball?

The volume of a standard regulation tennis ball is approximately 9 cubic inches.

To determine the volume of a tennis ball:

  • Tennis balls have a diameter of around 2.7 inches
  • Using the formula for volume of a sphere: V = 4/3 x π x r^3
  • Where r is the radius, or half the diameter: r = 1.35 inches
  • Plugging this into the formula: V = 4/3 x π x (1.35 inches)^3
  • This works out to roughly 9 cubic inches

So the total volume occupied by a regulation size tennis ball is about 9 cubic inches. This volume, along with the dimensions of the container space, can be used to calculate approximately how many tennis balls can fit into various vehicles, storage containers, etc. The standard volume allows ball capacity comparisons and estimates.

How Many Tennis Balls Can You Fit Into A Limousine?

The number of tennis balls that can fit in a limousine depends on the exact model and size. Most stretch limousines have an interior volume of around 150-200 cubic feet. Given that regulation tennis balls have a diameter of 2.7 inches and take up roughly 9 cubic inches each, fitting them into a limo packing them efficiently in pyramid stacks, experts estimate around 18,000-24,000 tennis balls could fit in a standard stretch limousine. The ball capacity varies based on limo dimensions, but efficient packing allows fitting tens of thousands of balls.

You May Also Read How Many Tennis Balls Can You Fit Into A Limousine?

How Many Tennis Balls Fit In A Car?

The number of tennis balls that can fit in a car depends on the car’s make, model, and interior volume. For an average sized sedan with around 100 cubic feet of usable space, and accounting for efficient stacking of the 2.7 inch diameter tennis balls, experts estimate approximately 5,000-7,000 tennis balls could fit in a standard car. With compact pyramid packing to minimize wasted space, a few thousand balls can fit in a car’s interior and trunk. The exact capacity varies based on the car dimensions.


What is the typical size of a regulation tennis ball? 

Standard tennis balls are around 2.7 inches in diameter.

How much interior space is in a double-decker bus? 

Total volume is 60-80 cubic meters depending on bus size.

How are tennis balls stacked to maximize space? 

Balls can be stacked in pyramid shapes to optimize fit.

How much wasted space is between stacked tennis balls?

Around 1/3 of a ball diameter or 0.9 inches between each.

What is the final estimate for ball capacity? 

Approximately 40,000-50,000 tennis balls can fit in a normal double-decker bus.


In conclusion, estimating the maximum number of tennis balls that can fit inside a double-decker bus requires breaking down the dimensions of both the balls and the bus interior. Standard tennis balls have a 2.7 inch diameter, and when stacked have about 0.9 inches of space between them. Double-decker buses range from 10-11 meters long and 2.4-2.6 meters wide, with interior heights around 1.8 meters on the lower deck and 1.3 meters upstairs.

Accounting for the gaps between stacked balls, the total usable volume is approximately 60-80 cubic meters depending on bus size. With each tennis ball taking up around 9 cubic inches, this works out to roughly 40,000-50,000 balls able to fit in a typical double-decker bus. Efficient packing really maximizes the storage!

While a strange question, calculating tennis ball capacity demonstrates how math and a bit of logic can provide solutions to everyday curiosities. The final ball estimate may vary based on bus dimensions, but this thought experiment was a fun way to merge my interests in tennis and statistics. I’d call that a successful mental workout!

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