Watch Accuracy Explained: Why Some Watches Are More Accurate Than Others

Introduction

When choosing a watch, many people focus on design, brand, or price. However, one important factor is often overlooked: accuracy.
Why do some watches gain or lose time faster than others? And what actually determines how accurate a watch is?

In this guide, we’ll explain watch accuracy in simple terms, covering different movement types, real-world accuracy standards, and what beginners should realistically expect from an everyday watch.

What Does Watch Accuracy Mean?

Watch accuracy refers to how closely a watch keeps time compared to the actual time.

Accuracy is usually measured in seconds gained or lost per day, such as:

• +5 seconds per day

• −10 seconds per day

No mechanical watch is perfectly accurate. Even highly precise watches will gain or lose a small amount of time.

Quartz vs Mechanical Watch Accuracy

Quartz Watches

Quartz watches are generally more accurate than mechanical watches because they rely on a battery-powered quartz crystal to regulate time.

If you’re still deciding which movement type suits your lifestyle, you may find this comparison helpful:
Mechanical vs Quartz Watches

Quartz watches are powered by a battery and regulated by a quartz crystal vibrating at a precise frequency.

Typical accuracy:

• ±10 to ±20 seconds per month

• Some high-accuracy quartz watches perform even better

Because of their consistency and low maintenance, quartz watches are generally the most accurate option for daily wear.

Mechanical Watches

Mechanical watches rely on springs, gears, and a balance wheel to keep time.

Typical accuracy:

• ±5 to ±20 seconds per day

• Performance varies depending on quality and adjustment

Mechanical watches are less accurate than quartz, but many people appreciate them for their craftsmanship and traditional watchmaking appeal.

Automatic Watches and Accuracy

Automatic watches are a type of mechanical watch that winds itself through wrist movement.

Their accuracy depends on:

• Movement quality

• How often the watch is worn

• Position when resting

• Regular servicing

Daily wear often improves consistency, while infrequent use can lead to larger time deviations.

What Affects Watch Accuracy?

Several factors influence how accurate a watch will be:

1. Movement Quality

Higher-quality movements are manufactured with tighter tolerances and better materials, improving stability.

2. Position

Mechanical watches may run slightly faster or slower depending on whether they are dial-up, crown-down, or worn on the wrist.

3. Temperature

Extreme heat or cold can affect lubricants and components, especially in mechanical watches.

4. Magnetism

Magnetic fields can disrupt mechanical movements and cause significant timekeeping issues.

5. Maintenance

Regular servicing keeps a mechanical watch running smoothly and within expected accuracy ranges.

Chronometer Certification Explained

Some watches are tested and certified for higher accuracy.

COSC Chronometer Standard

For mechanical watches:

• −4 to +6 seconds per day

This certification indicates that the movement has passed standardized accuracy tests, but it does not guarantee perfection in everyday wear.

Is Perfect Accuracy Necessary?

For most people, absolute accuracy is not essential.

A difference of:

• 10 seconds per day

• or even 30 seconds per day

is barely noticeable in daily life, especially if the watch is adjusted occasionally.

Choosing a watch should balance:

• Accuracy

• Reliability

• Comfort

• Personal preference

How to Keep Your Watch Accurate

Here are simple tips to maintain accuracy:

• Wear automatic watches regularly

• Avoid strong magnetic sources

• Store watches in a consistent position

• Service mechanical watches as recommended

• Adjust time periodically instead of expecting perfection

Final Thoughts

Watch accuracy is important, but it shouldn’t be the only factor when choosing a timepiece. Quartz watches offer excellent precision with minimal effort, while mechanical watches trade some accuracy for tradition and craftsmanship.

Understanding realistic accuracy expectations helps you appreciate your watch for what it is—whether it’s a practical everyday tool or a piece of mechanical art.