Magnetism makes a watch run fast—sometimes dramatically fast—by causing the hairspring coils to stick together. The core advice is simple: keep your watch at least 6 inches away from speakers, magnets, and inductive chargers. If you suspect magnetization, use a purpose-built demagnetizer designed for watches; doing it wrong can damage the movement. A short success check after 24 hours will tell you if the fix worked or if you need a watchmaker.
Quick Check – Is Your Watch Magnetized?
Before taking any action, confirm that magnetism is the likely cause rather than a regulation issue.
The watch runs fast – a gain of 30 seconds or more per day is a strong indicator of magnetization. The fast running is consistent – if the error changes depending on the watch’s position (dial up, crown down), the problem is more likely regulation than magnetism.
A simple compass test – place the watch face next to a compass needle. If the needle deflects significantly (more than 30°), the watch is magnetized. Smartphone magnetometer apps such as “Magnetic Field” on iPhone can also detect stray fields.
If the compass shows no deflection but the watch still gains 30+ seconds per day, the issue is mechanical regulation rather than magnetism. Skip any demagnetization attempt and take the watch to a watchmaker. Demagnetizing a non-magnetized watch will have no effect and may waste your time.
If the watch is running slow or stopping entirely, magnetism is not the culprit. Move directly to a watchmaker for diagnosis.
What Magnetism Does to a Watch Movement
A mechanical watch relies on a tiny balance spring (hairspring) that oscillates at a precise frequency. When exposed to a magnetic field, the hairspring’s ferromagnetic material becomes magnetized, causing adjacent coils to attract and stick together. This shortens the effective spring length, making the balance wheel swing faster. The result: the watch can gain several minutes per day—far beyond normal variation.
Even watches marketed as antimagnetic, such as the Rolex Milgauss or Omega models with Co-Axial movements and silicon hairsprings, are not completely immune to very strong fields. A household magnet or the motor inside a cheap watch winder can still affect them, though the tolerance is higher.
The Hidden Risk in Your Watch Winder
Many owners assume a watch winder is a safe resting place for an automatic watch. Yet many winders use small electric motors that emit a constant magnetic field. Over weeks or months, the watch movement can become progressively magnetized, especially if the winder is low-quality or the watch sits in a plastic or metal housing that does not shield against the motor’s field.
If you use a winder, test it with a compass. Place the compass inside the winder compartment while the winder is running. If the needle twitches, relocate the winder farther from other electronics or consider a manual watch winder (spring-driven) that uses no electricity. For long-term storage of a single watch, a simple static watch box is safer than an electric winder.
Assess Your Home for Magnetic Sources
The most common household magnetic sources are surprisingly strong up to a few inches away. The table below lists typical items and safe distances.
| Source | Typical Magnet Strength | Recommended Distance | Risk Level |
|---|---|---|---|
| Wireless phone charger | Moderate (inductive coil) | At least 12 inches | High – avoid direct contact |
| Laptop speakers | Weak to moderate | 6 inches | Low – fine beyond 6 inches |
| Large stereo speakers | Strong (woofer magnet) | 12 inches | High – inside 6 inches is dangerous |
| Magnetic bag or clasp closure | Moderate | 3 inches | Moderate – keep watch away when closed |
| Fridge magnet | Weak | 2 inches | Low – unless pressed directly |
| Induction cooktop | Very strong (active coil) | 3 feet | Extreme – never wear watch near one |
| Watch winder (electric) | Varies with motor | 12 inches or not in winder | Moderate to High – test with compass |
To test a specific source yourself, hold a compass near it while the device is off and then on. A magnetic field that appears only when the device is powered is an inductive field, such as from a charging pad.
Checkpoint: Walk through your home with your watch and a compass. Note any spots where the needle moves. Relocate your watch storage to a place where the compass stays still.
Create a Safe Storage Routine
Material matters. Wood, plastic, and leather are non-magnetic. Avoid metal watch boxes that can concentrate a field if placed near an electronic device.
Pick a dedicated shelf at least 3 feet from a Wi-Fi router, TV, computer tower, and any charger station. A wooden dresser top in a bedroom is often ideal.
When you remove your watch at night, place it on a soft cloth (supplied with many watches) rather than directly on a metal or glass surface. If you use a nightstand, keep the watch at the far edge away from any phone or charging pad.
For travel, use a leather or textile travel pouch. Avoid zippered metal cases that may have a magnetic clasp.
How to Demagnetize Your Watch at Home
Demagnetizing a watch at home is doable, but the tool and technique matter. A cheap bulk tape degausser made for screwdrivers can produce a field strong enough to damage a fine movement. Always use a demagnetizer designed for watches. These devices produce a controlled alternating magnetic field that gradually fades.
Ordered Steps
1. Set up. Place the demagnetizer on a wooden or plastic surface. Plug it in and press the button. You should hear a faint hum or feel a vibration.
2. Position the watch. Hold the watch face up, about 1 to 2 inches above the demagnetizer’s coil.
3. Activate the field. Press and hold the button. Slowly move the watch in a circle or up-and-down motion for 2 to 3 seconds.
4. Withdraw the watch. While still holding the button, slowly move the watch away from the demagnetizer—about 12 inches or until the hum fades. Then release the button.
5. Test. Check the watch against a time reference, such as an atomic clock app, for the next 24 hours. Also repeat the compass test.
6. Repeat if needed. If the watch still runs fast or the compass deflects, repeat the process once more. If no improvement after two attempts, stop. The issue may require professional demagnetization in a larger degausser.
Friction point: Do not hold the watch directly on the demagnetizer coil. Do not press the button for longer than 10 seconds at a time. The coil can overheat. If the demagnetizer becomes hot to the touch, let it cool for 5 minutes before another attempt.
Escalation threshold: If after two attempts the watch still gains 20+ seconds per day or the compass still deflects, stop home demagnetization. Professional demagnetization using a larger unit can address residual magnetization that home tools cannot. Additionally, if the watch begins running slow, stops, or shows erratic amplitude after demagnetization, there may be a mechanical issue such as a damaged hairspring, oil contamination, or a bent pivot. Take it to a watchmaker.
Verification and Success Check
After demagnetizing, verify that the watch returns to normal accuracy.
Run a 24-hour accuracy test. Set the watch to a precise time source like time.gov. After 24 hours, note the deviation. A mechanically healthy watch should be within ±10 seconds per day, though vintage pieces may allow more. If it still gains 20+ seconds, magnetism was likely not the sole cause.
Perform a compass re-test. Hold the watch near a compass. If the needle remains still, the field has been successfully removed.
Failure-mode detail: If the watch gains time unevenly after demagnetization—for example, +10 seconds one day and +40 the next—this can indicate that the hairspring still has residual magnetism in localized areas, or that a loose screw or debris was dislodged during the process. Do not attempt further demagnetization. Escalate to a watchmaker who can inspect the movement under a microscope.
FAQ
Can a magnet permanently damage a watch? No. Magnetism does not physically damage the metal; it only temporarily alters the hairspring’s behavior. Professional demagnetization or the correct home procedure restores normal operation completely.
How close is too close to a speaker? A typical bookshelf speaker’s magnet can magnetize a watch within hours if the watch is placed within 2 inches. At 6 inches, the risk drops sharply. Larger subwoofer magnets require at least 12 inches.
Does a smartphone magnetize a watch? The built-in speaker in a phone is weak, but wireless charging pads emit a strong inductive field. Never lay a watch on top of a phone’s charging area. Placing the phone next to a watch on a nightstand is safe if the distance is at least 3 inches.
Should I buy a demagnetizer? If you own multiple mechanical watches and see symptoms once or twice a year, a quality watch-specific demagnetizer is a worthwhile investment. For a single watch, visiting a watchmaker once is cheaper and safer.
The We Know Watches editorial team brings together over 40 years of combined watch collecting, trading, and repair experience. Our editors have owned and handled watches from every major brand — from entry-level Seiko 5s to Rolex, Omega, Patek Philippe, and independent Swiss watchmakers. We’ve bought and sold at auction, worked with authorized dealers, visited manufacturing facilities in Switzerland and Japan, and serviced hundreds of movements ranging from the Seiko 7S26 to the Longines L888. Every guide and review we publish is based on hands-on experience, original research, and consultation with professional watchmakers. We do not accept payment for reviews, and we clearly disclose when we use affiliate links.