What is the annual cost of tennis balls? The full calculation for Danish players

The three player profiles we're calculating for

Ball economy depends almost entirely on two things: how often you play, and how often you open new cans of balls. We have created three profiles that cover most Danish tennis players, from the recreational player to the club player who plays tournaments.

Of course, you might fall somewhere between these profiles, but most recreational players will find themselves somewhere in the A to B range. Profile C typically includes club and tournament players who want fresh balls for every match.

What do tennis balls cost in Denmark?

We conducted a survey across the largest Danish webshops (Pricerunner, Motion-online, Billigsport24, Ketcher.dk, and Tennisshoppen) in May 2026. The prices for a can of 4 balls are distributed as follows:

Most Danish club players buy in the 60-100 DKK range per can. This is what we use as a baseline in the calculation below: 80 DKK per can, 20 DKK per ball. If you primarily buy premium, you can simply scale the numbers up by approximately 35 percent.

The full annual calculation

The assumptions are visible throughout, so you can adjust them to your own game:

• Price per can: 80 DKK
• Balls per can: 4
• Playing weeks per year: 50 (we give you 2 weeks of tennis-free vacation)
• A new can also means the old can is effectively finished - this is total consumption, not just new purchases

This surprises most people. Balls feel cheap at the moment - it's "only" 80 DKK for a can. But the frequency makes the expense significant. A club player spends roughly the same on balls annually as they do on a decent pair of tennis shoes, a new grip tape subscription, and a racket stringing combined.

Profile C is not uncommon among seniors who play daily or people training for tournaments. 12,000 DKK a year is enough for a new racket every year - only for balls that end up in the trash within 8 weeks.

Where the money actually disappears

The interesting thing about numbers like these is figuring out where in the chain the money is actually lost. It's not the price per ball that's the problem. It's short lifespan combined with high frequency.

A tennis ball loses pressure in two ways. The first is passive diffusion through the porous rubber core - even a ball lying in its sealed can slowly leaks. According to a review by the ITF (International Tennis Federation) and independent ball tests, an unopened ball is typically significantly softer after 8 weeks. The second is mechanical stress during play. Each impact briefly deforms the rubber core and opens microscopic channels through which air escapes faster.

These figures are Balcour estimates based on reported consumption patterns from Danish club players, not laboratory data. The important point is not the percentages themselves, but that a significant portion of the annual ball expenditure goes to balls that could have lasted longer - if they had only been stored correctly.

How to halve your tennis ball expenses

The most expensive part of ball economics is not the ball itself. It's the high turnover rate. If you can extend a ball's useful life by a factor of 2 to 3, you will halve or third your annual expenditure - without compromising playing quality.

There are only a handful of things that really make a difference:

• Pressure storage between sessions. When a ball is in an environment with the same pressure as inside the ball, the gas has no direction to diffuse. This almost completely stops passive pressure drop. Pressurebox Pro is based on this principle.
• Rotate your balls. Never play with just one can until it's worn out. Switch between 2-3 cans so each set gets a rest period. This distributes the mechanical stress.
• Keep the can lid on. It doesn't seal perfectly, but it roughly halves the diffusion during storage for the opened can in your bag.
• Room temperature and darkness. Heat accelerates diffusion, UV degrades the felt cover. The bag in the car in summer is the worst storage option.

If we take profile B (4,000 DKK per year) and halve the annual consumption with pressure storage, the saving is around 2,000 DKK. Pressurebox Pro pays for itself within the first year for most club players - and from year two, it's pure savings.

A perspective: profile C spends 12,000 DKK per year. Even a more conservative halving means 6,000 DKK annually. That's enough money to have your racket professionally strung six times - or simply fewer discarded balls in the trash can.

If you want to delve deeper into ball economics, we also have the corresponding calculation for padel balls, and the guide to how long tennis balls actually last. If you are looking for the technical explanation of why pressure disappears, start with the article on why balls lose pressure.