Padel ball vs tennis ball: what's different

If you’ve played tennis and someone’s handed you a padel ball for the first time, it probably felt familiar right up until you hit it. Same size, roughly, same fuzzy yellow felt – and then a completely different game. That’s not your imagination. The two balls are built to different specs, and the gap between them explains a lot about why padel plays the way it does.

Here’s what’s different, what’s just a myth, and whether you can get away with using one for the other.

The size myth: they’re not quite identical

Padel and tennis balls are close in size but not the same – padel’s official range is 6.35-6.77cm, tennis is 6.54-6.86cm, so a padel ball can be marginally smaller.

FIP sets padel ball diameter at 6.35–6.77cm. The ITF’s tennis spec runs 6.54–6.86cm. The two ranges overlap in the middle, which is why a padel ball and a tennis ball sitting next to each other look near enough identical – and why the idea that padel balls are “smaller” is more myth than rule. Weight is where they match exactly: both sit between 56g and 59.4g. If you’ve heard someone claim padel balls are a different weight class, that’s simply wrong.

The visible size difference you might have noticed at a club is more likely down to brand and batch variation than the sport itself.

Pressure is the real difference

Padel balls run at 10.1-11.4 PSI. Tennis balls run at roughly 14 PSI. That gap is what separates the two games, not size or colour.

This is the number that matters. FIP regulations require an internal pressure of 4.6–5.2 kg per square inch, about 10.1–11.5 PSI. A pressurised tennis ball is usually quoted at around 14 PSI – noticeably firmer. Drop each ball from 2.54 metres and a padel ball bounces to 135–145cm; a full-pressure tennis ball bounces higher and holds its speed longer.

That difference isn’t an accident of manufacturing. Padel is played on a 20 x 10 m court, about 23% smaller than a tennis doubles court, enclosed by glass and mesh walls that the ball can be played off once it has bounced. A ball at tennis pressure would come off the glass too fast and too high to control – rallies would turn into pinball. The lower pressure keeps the ball behaviour matched to a court where the walls are as much a part of the point as the racket.

Felt plays a smaller supporting role here too. Padel ball felt tends to run thicker – around 1.5mm against a tennis ball’s 1mm – which adds a touch more grip and control off the glass and the racket face, on top of what the pressure difference already does.

Can you swap one ball for the other?

Technically yes for a casual hit, but not for a real session – tennis balls bounce too high and too fast for padel’s glass-wall game, and the reverse leaves a tennis ball feeling dead and unresponsive.

If a mate hands you a stray tennis ball on a padel court and you’re just larking about for ten minutes, it won’t ruin your afternoon. But play a proper game with one and you’ll notice it almost immediately: the ball comes off the back glass faster than you can react to, serves that should sit up nicely fly past you, and rallies that should last six or seven shots end in two.

Go the other way – try a padel ball on a tennis court – and the problem flips. The lower pressure means the ball sits down instead of carrying through the court, so groundstrokes feel flat and serves lose most of their pace. Neither substitution is dangerous, but neither is worth doing beyond a few minutes of muscle memory.

Official competition rules out any ambiguity here anyway: padel matches require FIP-approved balls, full stop. If you’re buying your own, the padel ball buying guide covers which brands are worth stocking up on.

Durability on UK indoor courts

Padel balls tend to wear faster than tennis balls in the same number of sessions, mostly because of how often they hit textured surfaces and glass rather than open grass or hard court.

Padel is played on artificial surfaces – the rules allow cement, synthetic material or artificial grass – inside glass walls and mesh fencing. Every one of those surfaces grinds at the felt in a way that open tennis courts generally don’t. Add in the fact that padel rallies involve far more wall contact than a typical tennis point, and it’s easy to see why a can of padel balls loses its liveliness after three to five sessions rather than lasting a whole season the way a tennis club’s stock might.

Cold indoor venues make it worse. Padel ball pressure explains why temperature swings speed up pressure loss specifically, which matters more in the UK than in warmer padel markets where most buying guides are written.

None of this means padel balls are poorly made – tennis balls just aren’t being asked to survive repeated glass and mesh contact at pace, so the comparison isn’t really fair to either one.

How each ball behaves off the wall

A padel ball’s lower pressure and thicker felt make it grip and slow down against glass, where a tennis ball at full pressure would skid and accelerate.

This is the difference that matters most once you’re on court, and it’s rarely explained in generic buying guides because most of them are written for tennis players who’ve never hit a ball off glass. When a padel ball meets the back wall, the lower pressure absorbs some of the energy and the thicker felt grips the surface fractionally longer, which is what lets you read the rebound and set up a shot. A tennis ball at 14 PSI would skid off the same glass with far less predictability – part of why the sports feel so different even though the court layouts share a similar rhythm.

This also explains why a padel ball that’s lost pressure becomes hard to play with rather than just slower. Once a ball drops below the FIP range, the wall behaviour stops being predictable in either direction – it neither grips properly nor carries pace cleanly. That’s a different failure mode to a dead tennis ball, which mostly just loses bounce height on an open court with no walls to complicate things.

What to buy as a tennis crossover

Buy FIP-approved padel balls specifically – don’t assume your tennis ball stock is a stopgap, and don’t buy padel balls expecting them to double up for tennis.

If you’re coming from tennis and trying padel properly for the first time, the only real decision is which padel ball to buy, not whether your existing tennis balls will do. Most UK clubs supply balls for casual sessions, so you likely won’t need to buy any straight away. Once you’re playing regularly enough to want your own, HEAD and Dunlop are the two most common premium picks at UK clubs, with Bullpadel as the budget-friendly option for social sessions where four players are splitting a can.

Skip anything not carrying FIP approval – off-spec balls exist and they’ll feel noticeably wrong, especially to someone with a tennis background who already has a strong sense of how a ball should behave off the strings. If you want the full picture on brands, pricing, and lifespan, the padel ball buying guide has the detail. And if the switch from tennis is a bigger transition than just the ball, padel vs tennis covers the full comparison – court, racket, serve, and scoring – for anyone still deciding which sport to spend their evenings on.