Magnetization on Watches: Causes, Effects, and Solutions

A watch that suddenly starts gaining ten minutes a day has not necessarily broken. In a huge number of cases, the real problem is invisible and completely reversible: magnetism. Phones, laptop lids, speaker magnets, and even some handbag clasps carry small magnetic fields strong enough to disturb the tiny steel parts inside a mechanical watch. The fix usually takes less than a minute once the cause is identified, though most owners have never heard of it and instead wonder whether their watch needs servicing. Understanding how magnetization works makes it easier to recognize the symptoms early, avoid the situations that cause it, and skip an unnecessary trip to a watchmaker.

What Does It Mean When a Watch Is Magnetized?

A magnetized watch has picked up an unwanted magnetic charge in one of its internal metal parts, usually the hairspring, which makes the watch run inaccurately. This does not mean the watch is damaged. It means a magnetic field has temporarily altered how a tiny coiled spring inside the movement behaves, throwing off its normal timing.

Mechanical and automatic watches keep time using a balance wheel that swings back and forth at a steady rate, controlled by a hairspring, also called a balance spring. This spring is thinner than a human hair and coils and uncoils many times per second. Once it picks up a magnetic charge, individual coils can cling to one another instead of moving independently, which leaves less spring free to flex. A spring with less working length swings back and forth faster than it was designed to, and that faster rhythm is what makes the watch run noticeably ahead of the correct time.

A watch losing or gaining more than the usual few seconds a day, especially if it starts running noticeably fast, is one of the clearest signs of magnetization.

Most mechanical watches are built to vibrate at a fixed rate, commonly 28,800 vibrations per hour, though some run at 21,600 or higher. That rate depends entirely on the hairspring’s length and elasticity staying consistent and predictable. Once a stray magnetic field pulls sections of that spring together, the rate is no longer fixed, and the watch simply cannot keep the timing it was designed for. This is also why the problem is so easy to reverse: nothing is broken or worn out, the spring’s coils just need to be separated and returned to their normal shape, which a demagnetizer does almost instantly.

What Causes a Watch to Become Magnetized?

Watches become magnetized from everyday contact with objects that carry magnetic fields, and modern life is full of them. The biggest culprits are things people keep close to the wrist without thinking twice, among them:

• Smartphones and tablets, especially near the speaker or camera modules
• Laptop lids and their magnetic clasps
• Bluetooth speakers and headphone cases
• Handbag and wallet magnetic snap closures
• Refrigerator door magnets
• Metal detectors, MRI machines, and industrial equipment
• Watch winders or watch boxes with magnetic clasps

None of these need to touch the watch directly for very long. A watch resting on a speaker overnight, or sitting in a bag next to a magnetic clasp for a day, is often enough. The strength of the field and how close it gets to the movement both matter more than the length of exposure.

To put the numbers in perspective, a typical refrigerator magnet produces roughly 50 to 60 gauss, and phones with strong built-in case magnets, such as those used for magnetic charging accessories, land in a similar range. That happens to be close to the baseline used for everyday magnetic exposure in watch industry testing, which shows how common this kind of contact really is. It does not take an unusual or extreme object to magnetize a watch; it takes an ordinary one held a little too close for a little too long.

Are Some Watches More Sensitive to Magnets?

Mechanical and automatic watches are the ones affected, because their timing depends on metal parts moving freely. Quartz watches contain a battery-powered circuit and a tiny motor instead of a swinging balance wheel, so they are far less likely to be thrown off course, though it can still happen in rare cases if the stepper motor itself picks up a charge.

Watchmakers have also built specific alloys to resist this problem. Materials like silicon, Nivarox, and other non-magnetic hairspring alloys are far less susceptible than older steel springs, which is part of why some modern watches marketed as “antimagnetic” hold up so much better in daily life.

This is not a new concern. By the 1960s, most Swiss watch movements already used a Glucydur balance wheel paired with a Nivarox hairspring specifically to cut down on magnetic sensitivity, alongside non-magnetic materials in the escape wheel and anchor. Older watches built before these alloys became standard, particularly vintage pieces with plain steel hairsprings, tend to pick up a magnetic charge more easily and more often than a modern watch will.

How to Tell If a Watch Is Magnetized

The clearest sign is a watch that suddenly runs much faster than normal, often gaining several minutes a day instead of the usual few seconds. This is the single most reliable clue, since a healthy mechanical watch should stay accurate within a small, predictable range.

Several other patterns point to the same cause:

1. The watch was running fine, then abruptly started gaining significant time with no other explanation
2. The seconds hand appears to tick unevenly or stutter instead of moving smoothly
3. The watch stops and starts unpredictably

Magnetism can also be tested for at home with basic tools. A simple analog compass, placed on a flat, level surface away from other electronics, will reveal it: bringing the watch slowly toward the compass causes the needle to swing and follow the watch’s position if a charge is present. Several smartphone apps that measure magnetic fields achieve a similar result, since phones already contain a magnetometer for their built-in compass feature.

A watchmaker can confirm the diagnosis more precisely using a timegrapher, a machine that measures the exact beat rate of the movement. If the watch is gaining or losing more than around 30 seconds a day and the sound of the balance wheel’s ticking looks uneven on the readout, magnetization is almost always the explanation.

Is a Magnetized Watch Permanently Damaged?

No, in almost every real-world case, magnetization does not cause permanent or lasting damage to a watch. The magnetic charge sits in the metal temporarily and can be removed just as easily as it appeared.

This is genuinely good news, because it means a magnetized watch is one of the cheapest and fastest problems to fix in all of watchmaking, not unlike the old myth that a mechanical watch can be overwound: a worry that sounds serious but rarely holds up in practice. Permanent harm would require an extreme, unusually powerful magnetic source, far beyond what a phone or speaker produces. For nearly every owner, a magnetized watch is a temporary inconvenience rather than a real repair.

The kind of exposure that could genuinely damage a movement usually involves industrial equipment, strong laboratory instruments, or powerful rare-earth magnets used well outside normal daily life, and even then the more common outcome is still just a timing problem rather than broken parts. Watchmakers occasionally see a watch that needs more than one demagnetizing pass to fully correct, or one where a part has shifted slightly out of position from the exposure, but a full replacement of the hairspring or movement due to magnetism alone is rare.

How to Fix a Magnetized Watch

A magnetized watch is fixed with a demagnetizer, a small device that generates an opposing magnetic field to cancel out the charge sitting in the movement. The process itself usually takes only seconds to a couple of minutes, and it follows a fairly consistent sequence:

1. The watch is stopped, typically by pulling out the crown so the movement is not running during the process
2. It is held near the demagnetizer’s coil or surface, following that particular device’s instructions
3. A pulse or field is activated by pressing the trigger button
4. The watch is slowly pulled away from the device while the field is still active, which helps fully clear the charge
5. The result is checked with a compass, a magnetometer app, or simply by observing the watch’s timekeeping over the next day

Rubbing a magnetized watch with a random magnet does not fix it, and neither does putting it in the freezer or leaving it in sunlight, despite advice suggesting otherwise. None of that removes a magnetic charge, and holding a stray magnet near the movement can make the problem worse rather than better. A proper demagnetizer works by rapidly reversing its field as the watch is pulled away, which is what actually cancels the charge out.

Many jewelers, watch shops, and watchmakers own a demagnetizer and run this service in a couple of minutes, often free or for a small fee. Compact, affordable demagnetizers are also sold for home use, and owners of several mechanical watches or vintage pieces sometimes keep one on hand as a routine precaution.

If the watch is not fully corrected after one pass, running the process again typically finishes the job. A watch that still runs poorly after being properly demagnetized may have an unrelated mechanical issue, and that is the point where a professional watchmaker should take a closer look.

Demagnetizing does not wear down or weaken a watch in any way, so there is no real downside to repeating it if the first attempt did not fully resolve the problem. Collectors building a growing watch collection sometimes make a habit of running every incoming vintage piece through a demagnetizer before wearing it, simply because packages travel near sorting equipment, scanners, and other watches that may already carry a charge. It is treated as routine maintenance rather than a repair.

How to Prevent Watch Magnetization

The simplest way to prevent magnetization is keeping a watch a reasonable distance away from phones, speakers, laptops, and other magnetic objects during daily life. A gap of a few inches is usually enough to avoid any real effect from common household electronics.

A handful of habits reduce the risk substantially:

• Watches resting directly on phones, tablets, or laptops face the highest everyday risk
• Magnetic clasps on bags, wallets, and cases carry enough charge to matter over time
• Wooden or fabric-lined storage boxes are safer than stacking watches against speakers or electronics
• Industrial machinery, MRI rooms, and strong retail security gates are worth extra caution around
• Owners of several watches exposed to daily electronics often find a small demagnetizer a useful routine tool

For anyone shopping with this specific issue in mind, watches built with modern anti-magnetic materials, such as silicon hairsprings, offer real protection against everyday exposure. Industry testing standards like ISO 764 require a watch to withstand a magnetic field of 4,800 amperes per meter, roughly 60 gauss, while staying accurate to within about 30 seconds a day, and several manufacturers build movements that go far beyond that baseline for extra peace of mind.

This category of watch exists because of a real, practical need. Rolex introduced the first Milgauss in 1954, built for researchers at CERN and other scientists and engineers working in nuclear, aviation, and medical fields where strong magnetic fields were part of the job, protecting the movement with an inner case made of soft iron that shields it much like a metal box shields whatever sits inside it. IWC took a similar approach with its 1955 Ingenieur, which could resist fields up to 80,000 A/m, and pushed that figure much further by 1989 with the Ingenieur Reference 3508, rated to withstand an extreme 500,000 A/m. Decades later, Omega took a different approach entirely, building movements from non-magnetic materials like silicon so thoroughly that some models resist fields above 15,000 gauss without needing a protective shield at all. For anyone who spends real time around machinery, medical equipment, or strong electronics, a watch built to one of these standards removes the problem before it ever starts.

Frequently Asked Questions

The Bottom Line

Magnetization is one of the most common watch problems and, fortunately, one of the easiest to solve. When a watch suddenly starts gaining several minutes a day, a magnetic field is almost always the reason, not a broken part. A quick pass with a demagnetizer, available from most watch shops in a couple of minutes, resolves the issue in nearly every case with no lasting harm to the movement. Keeping a watch a small distance away from phones, speakers, and magnetic clasps remains the easiest way to avoid running into the problem at all.