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Watch water resistance is expressed in bar, ATM, or meters. A watch is considered water-resistant—and suitable for showering—starting at 5 bar/ATM or 50 meters. Watches rated at 10 bar/ATM or 100 meters are suitable for swimming, while those rated at 20 bar/ATM or 200 meters are suitable for diving. Watches rated at 1 bar or 3 bar, or simply marked "water-resistant," are only splash-proof. The range of water-resistant watches at Watch.co.uk includes over 5,000 models of 5 ATM+ that vary in price from approx. £20 to £6200. Filter the selection by water resistance level to find the perfect watch. Orders placed on business days are shipped the same day.
Just because a watch is water-resistant does not mean you can blindly assume it is safe to dive into the sea without a care. Whether or not a watch is suitable for this depends on its level of water resistance, expressed in meters, ATM (atmospheres), or bar (air pressure). While most watches can withstand a bit of perspiration or the occasional splash of water, only specialized sports and diving watches are designed to withstand water pressure.
The history of water resistance in watches is a fascinating evolution spanning more than a century and a half, driven by warfare, athletic achievements, and deep-sea exploration.
As early as the 19th century, watchmakers experimented with protecting pocket watches from water and dust. For instance, at the 1851 Great Exhibition in London, the watchmaker W. Petite & Co. displayed a pocket watch that kept ticking while submerged in a glass bowl filled with water and fish. However, the true need for water-resistant wristwatches only arose during the First World War. In the muddy trenches, watches were vulnerable to moisture. This led to the development of so-called "trench watches," such as the patented Depollier/Waltham watch case from 1916.
The first major commercial breakthrough came in 1926, courtesy of Rolex founder Hans Wilsdorf. He introduced the Rolex Oyster, the first wristwatch featuring a hermetically sealed, screw-down case, bezel, and crown. To demonstrate its water resistance to the world, Wilsdorf provided one such watch to British swimmer Mercedes Gleitze for her English Channel crossing in 1927. After more than ten hours in the freezing water, the watch was still functioning flawlessly. In the years that followed, the focus shifted toward actual deep-sea diving. The Omega Marine was the first watch specifically designed and certified for diving; thanks to a patented case design, it was successfully tested at depths of up to 135 meters. With the rise of recreational scuba diving, Blancpain (with the Fifty Fathoms) and Rolex (with the Submariner) launched the blueprint for the modern dive watch. These cases could withstand pressures at depths of 100 to 200 meters and featured a rotating bezel for measuring dive time.
In the decades that followed, the water resistance of watches was continuously improved. In the 1960s, watches such as the Rolex Sea-Dweller introduced the helium escape valve, designed to prevent the watch crystal from popping off when professional saturation divers returned to the surface in decompression chambers. Today, dive watches can easily withstand depths of up to 3,000 meters (or more), thanks to high-quality rubber and silicone gaskets and ultra-durable sapphire crystals.
A significant legal and linguistic shift occurred around 1990. Until then, the term "waterproof" was widely used. However, since no watch is guaranteed to be 100% waterproof under every circumstance, as gaskets inevitably wear down over time, the term was officially changed to "water-resistant" in accordance with strict ISO standards. Nowadays, the level of water resistance is always expressed in ATM, bar, or meters, clearly indicating to the consumer what the watch is and is not suitable for. You can find more information on this topic on our dedicated information page.
These watches are designed for normal daily use and can withstand splashes, heavy rain, or hand-washing. Models with a 5 ATM rating can sometimes be worn in the shower, although watchmakers advise against this because the combination of hot water and soap causes gaskets to age faster. They are not suitable for swimming. You will primarily find this type of watch in the collections of fashion brands such as Cluse, Fossil, and Guess, as well as brands with many dress watches in their lineup, such as Hugo Boss, Movado, and Frederique Constant.
This type of watch is built for an active lifestyle and is fully suitable for swimming, snorkeling, and surface water sports. Thanks to more robustly sealed cases—and often a screw-down crown or extra gaskets—these watches can withstand water pressure and movement. However, they are not designed for deep diving or scuba diving. You will mainly find this type of watch in the collections of G-Shock, Ice-Watch, and Lorus. Watches from Casio Edifice, Swiss Military, and Maserati are also (almost) always water-resistant to 10 ATM.
These are professional tool watches that must meet the strict ISO 6425 standard. They are equipped with a screw-down crown, a screw-down case back, thick sapphire crystal, and a unidirectional rotating bezel for measuring dive time. These watches can withstand great depths, scuba diving, and extreme water pressure. You will primarily find these watches from brands such as Citizen, Seiko, Orient, and Certina. In the luxury segment, they are sometimes also equipped with a helium escape valve for saturation diving. In the Watch.co.uk collection, these include watches from Edox and Hamilton.
While the criteria for water resistance are identical, the differences between men's and women's water-resistant watches lie primarily in the technical constraints imposed by smaller case sizes and the focus on aesthetics. Successfully sealing a watch against high pressure (10 ATM and above) requires thick rubber or silicone gaskets, a screw-down crown, and a thicker crystal or case back. Because men's watches are larger (38–45 mm), the case offers more room to accommodate this robust construction. Women's watches are often more compact and slender (26–34 mm), making it technically more challenging to ensure high water resistance without compromising the watch's elegant profile.
The vast majority of professional dive watches (20 ATM+) are designed for men, as they were traditionally viewed as functional "tool watches." Consequently, the selection of genuine mechanical dive watches with ISO certification in smaller sizes for women is far more limited. Furthermore, women's watches often feature decorative elements such as diamond-set bezels or crowns topped with sapphire cabochons. Such ornate details are more difficult to seal effectively against water than a plain steel dive bezel and an industrial-style screw-down crown.
Watch.co.uk offers a range of over 5,000 watches with a water resistance rating of at least 5 ATM. This means there is a huge variation in price, from €29 for a simple Casio watch to over €7,000 for a limited-edition MR-G G-Shock. You can spend as little or as much as you like; simply choose the watch that suits you within your preferred price range.
Given the vast selection available, it is difficult to pinpoint exactly which waterproof watches are the most popular overall. In the price range up to €100, watches from Lorus, Lotus, and Ice-Watch are the top choices. Between €100 and €300, Casio Edifice, Orient, and Tissot are popular. Up to €500, Citizen and Seiko lead the way. Finally, in the highest price range, Hamilton, Certina, and Edox are the most popular brands for waterproof watches.
A watch is considered waterproof when its case, crystal, and crown are securely sealed using screw-down mechanisms and/or rubber gaskets. Water resistance is indicated in terms of pressure (ATM, Bar) or depth (meters). You can read more about the different levels of water resistance on our blog.
You can shower with a watch that has a water resistance rating of at least 5 ATM (or 5 bar or 50 meters), provided the watch strap is also water-resistant. Is a watch with a water resistance rating of 50 meters waterproof? Yes, a watch rated for 50 meters is waterproof. However, a 50-meter rating does not mean you can dive to a depth of 50 meters. It refers to the pressure exerted by a stationary 50-meter column of water. A 50-meter rating (or 5 bar or 5 ATM) means you can safely shower while wearing the watch. It should also withstand heavy rain or brief immersion in cold or lukewarm water. You can find more information about water resistance here.
In principle, you can swim and snorkel with a 10 ATM waterproof watch. However, be mindful of significant temperature fluctuations. If you have been lying in the sun and suddenly jump into the cold sea, the watch could suffer damage due to the drastic temperature change. With a 20 ATM (or higher) diving watch, especially one equipped with a helium escape valve to protect against overpressure, you can enter the sea with confidence. Always rinse the watch with fresh water after swimming, as salt can damage or corrode the materials.
Smartwatches are subject to a different water-resistance standard than regular watches. Read more about it on our blog.
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