Water Resistance Ratings Explained

The number printed on a watch's dial or caseback, such as 50m or 100m, is one of the most misunderstood specifications. It does not mean you can take the watch to that depth.

The rating comes from laboratory pressure testing under static conditions. Real life adds movement, temperature changes, and wear on the seals, so the practical limits are lower than the number suggests.

As a rough guide, a 30m rating means the watch can handle splashes and rain, but should not be submerged. 50m is fine for brief contact such as washing your hands. 100m usually covers swimming and snorkeling. 200m and above is the territory of true diving watches intended for scuba diving, ideally with a screw-down crown.

Several things reduce water resistance over time. Gaskets age and dry out, so even a well-rated watch should have its seals tested periodically, especially after a battery change or service. Hot water, steam, and soap can damage seals, so avoid wearing a watch in the shower or sauna. Never operate the crown or pushers underwater unless the watch is designed for it.

Leather straps and water do not mix well, so choose a rubber or metal bracelet if you plan to swim. If a watch has been exposed to water and you notice condensation under the crystal, have it checked right away.

When in doubt, check the manufacturer's guidance for your specific model. Our catalog lists the stated rating for every watch, so you can filter for the level you need.