guides
Watch water resistance explained: 30m, 50m, 100m, 200m
The number on your dial is one of the most misread specs in watches. Here is what those ratings actually buy you — and how to avoid an expensive mistake.
The rating is a lab test, not a depth
A “30m” or “200m” figure comes from a static pressure test in a lab, not a promise about real depth. In the real world, movement through water, jets from a tap, and temperature swings all raise the pressure a watch actually feels. So the sensible move is to treat every rating conservatively.
What each rating really means
- 30m — hand-washing, light rain and splashes only. No swimming, no showering. This covers most dress watches (the Orient Bambino, for example).
- 50m — everyday splashes and brief surface contact. Still not for real swimming or water sports.
- 100m (10 ATM) — the lowest rating where you can confidently swim. It’s the most versatile all-rounder for daily wear.
- 200m and up — genuine dive-watch territory, provided the watch is in good condition and the crown is fully seated.
The rules that actually protect the watch
- Hot showers are worse than swimming. Heat expands the seals and steam sneaks past them, so keep any non-dedicated diver out of the shower entirely.
- Never touch the crown or pushers underwater, or with wet hands. And if your watch has a screw-down crown, always confirm it’s fully screwed in before it goes near water.
- Seals age — and Bangladesh’s heat and humidity are hard on them. If you swim with a watch, have it pressure-tested every one to two years.
The one-line takeaway
Match the watch to how you’ll actually use it, and treat any vintage or pre-owned piece as splash- only until its seals have been checked. Do that and a good watch will outlast you. Not sure what a particular watch is safe for? Ask us before you get it wet — that’s a free question.