Can you swim with a G-Shock? Yes, and 200 metres is far more than swimming needs

The short answer

This question gets asked because watch water ratings are genuinely confusing, and because most watches rated "30 m" or "50 m" should not be swum in at all. G-Shocks are the opposite case: they are over specified for swimming by a factor nobody will ever test.

Every G-Shock we rank on this site carries a published 200-metre rating. The DW-5600E, the DW-9052, the DW-6900, the GA-2100, the GMA-S2100, the GM-5600, the GMW-B5000, the GBD-200, the GBD-H2000, the Rangeman GW-9400, the Mudman GW-9500 and both Mudmasters are all 200 metres, shock resistant, and in the case of the Mud series mud resistant on top. The Pro Trek models step down to 100 metres, which is still comfortably past swimming.

What 200 metres actually means

It does not mean you can take the watch to 200 metres of depth, and it does not mean you cannot. It means the case passed a static pressure test equivalent to that depth, in a lab, on a new watch with fresh gaskets.

Two things that test does not model:

• Dynamic pressure. Moving through water, a dive off a board, or water hitting a watch at speed creates momentary pressure well above the static depth. A 200-metre margin swallows that easily. A 30-metre rating does not, which is why 30 m watches should not be swum in.
• Age. Gaskets harden and compress over years. A ten-year-old watch with original seals is not holding its original rating, which is why Casio service centres replace gaskets whenever a case back comes off for a cell.

The practical translation for swimming is that a 200-metre G-Shock is fine in a pool, a lake, the ocean, the surf and a shower, indefinitely. The whole rating system, including why 3 ATM watches are rain-only, is in watch water resistance explained.

The one rule: never press a button underwater

If a G-Shock floods, this is almost always why.

A pusher is the weakest seal on the watch: a shaft through the case wall with a gasket around it. Pressing it moves that shaft against the gasket, and under water pressure that is the moment water can get past. Casio says so in its own operation guides, and so does every other watch maker.

So the rule is simple and absolute on any watch that is not specifically rated for it: get the watch out of the water before you touch a button. On a swim stroke that is half a second. The same rule applies to the crown on an analog watch, and to the light button, which people forget because it feels harmless.

The exception is a watch whose maker explicitly rates the buttons for submerged use, which some dive watches and a few GPS watches do; Garmin, for instance, specifies leakproof metal buttons on the fenix 8 and dive-rates that case. Casio makes no such claim on the models here, so treat the rule as absolute.

Is a G-Shock a dive watch?

No — and this is the one place to be precise, because "200 metres" and "dive watch" are not the same claim.

A diver's watch in the regulated sense meets ISO 6425, which adds requirements beyond a depth test: a unidirectional elapsed-time bezel or equivalent, legibility of the elapsed-time indication in darkness at 25 cm, resistance to a specified thermal shock, magnetic and shock resistance, and testing of the individual watch rather than a sample. A watch meeting it is marked "DIVER'S" with its depth.

The G-Shocks on this page are 200 metres water resistant and we do not claim ISO 6425 for any of them, because the sources we read do not state it. Casio does build a dedicated dive line, and the one model from it we now cover in full is the analog Frogman: Casio rates it as an ISO diver's 200 m watch, which is a different and stricter claim than the figure on the back of the watches here. The detail is in our Frogman GWF-A1000 review.

Practically, the distinction matters for scuba and not for anything else. For swimming, snorkelling, surfing, kayaking and jumping off things, a 200-metre G-Shock is more watch than the activity needs. If you want a watch with an actual certified dive rating, the site's picks are in most durable watches, and the dive-rated GPS options are in best watch for kayaking.

Chlorine, salt and the resin band

Neither chlorine nor salt will get through a 200-metre case. Both will work on the parts outside it.

Chlorine is hard on resin over time. A pool watch's band will stiffen and then crack sooner than a dry-land watch's will, and chlorine residue left in the gaps around the pushers is mildly corrosive to the steel case back and spring bars. None of that is a failure; it is a band every few years, which is a cheap part.

Salt is worse, and for a different reason: when sea water dries it leaves crystals in the pusher gaps, around the spring bars and in the case back groove. Those are abrasive and they hold moisture against metal. A metal G-Shock such as the stainless GMW-B5000 is the one most worth rinsing for this reason; a resin case genuinely does not care about the salt itself.

Sunscreen and sand are the sleeper problems. Sunscreen degrades resin and sand grinds into buttons, which is a different failure from water and is why Casio rates the Mud series separately for mud resistance. The material trade-offs are in resin vs steel cases.

The picks

If you want it to count laps

Water resistance and swim tracking are different questions, and most G-Shocks do the first and not the second.

The exception on this site is the GBD-H2000, which Casio specifies with GPS, wrist heart rate, compass, altimeter, barometer and thermometer, and which publishes a battery figure for pool swimming of approximately 50 hours alongside 14 hours of high-accuracy GPS and about 79 hours of gym workouts. It is a large watch at 59.6 by 52.6 by 19.4 mm, it is 63 grams, and it has solar-assisted charging with USB as a backup.

If lap counting and distance in open water are the point of the purchase rather than a bonus, a GPS watch is the better instrument, and the options are in best rugged GPS watches. If you simply want a watch to be on your wrist in the water and to still be running in ten years, the DW-5600E does that for very little money.

The care routine

1. Keep buttons dry when you press them. The whole rule, in one line.

2. Rinse in fresh water after chlorine or salt. Thirty seconds under a tap, working the buttons while the water runs over them, then dry face up.

3. Get the gaskets replaced with the battery. Any time a case back comes off, the seals should be replaced and the case pressure-tested. This is the single reason a solar G-Shock is the better pool watch: with Tough Solar the case may never need opening at all, as covered in G-Shock solar battery replacement.

4. Replace the band before it cracks. Chlorine shortens resin life. A spare band costs very little while the model is current.

5. Do not take a 200-metre watch scuba diving and call it a dive watch. For everything short of that, it is the most over-engineered thing on your wrist.