What Does 50m / 100m / 200m Water Resistant Mean?
By World of Watches •
Water resistance ratings measure how well a watch resists pressure, not how deep you can dive. As a rough guide, 30 m means splashes, 50 m is light water contact, 100 m suits swimming and 200 m and above suits snorkelling and diving, but check the brand's guidance for your watch.
A Rough Guide
- 30 m / 3 ATM: Splashes and rain. Not for swimming.
- 50 m / 5 ATM: Light water contact. Take care in the shower.
- 100 m / 10 ATM: Swimming and snorkelling.
- 200 m / 20 ATM and more: Diving and watersports, on watches built for it.
These are guides. Always check what the brand recommends for your watch.
What Reduces Water Resistance
- Age: Gaskets harden over time.
- Knocks: A hit to the crown or case can break the seal.
- Heat and steam: Hot showers and saunas can damage seals.
- Opening the case: A battery change affects the seal unless it is tested.
Keep It Tested
If you swim with your watch, have the seals and water resistance tested every year or two.
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Frequently Asked Questions
Can I swim with a 50 m watch?expand_more
Light swimming may be possible on some, but 100 m is safer. Check the brand.
Can I shower with my watch?expand_more
It is best not to, especially with hot water.
Does 200 m mean I can dive 200 m?expand_more
No. It is a pressure rating. Use a proper dive watch for diving.