How to Wind an Automatic Watch (And How Often You Should)

An automatic watch winds itself while you wear it, so why does it stop on your nightstand, and should you ever wind it by hand? This guide covers exactly how to wind an automatic watch, how many turns it needs, whether you can overwind it, and the small mistakes that cause most problems.

Quick answer

If your automatic watch has stopped, unscrew the crown (if it is a screw-down crown), leave it in the first position, and turn it clockwise about 30–40 times. Then set the time.
If your watch cannot be hand-wound (for example the Seiko 7S26 in older Seiko 5 and SKX models), gently swing or shake it side to side for about a minute instead.
You cannot overwind a modern automatic watch. A slipping clutch protects the mainspring.

How an automatic watch winds itself

Inside an automatic movement is a half-moon shaped weight called the rotor. When your wrist moves, the rotor spins and winds the mainspring, which stores energy and slowly releases it to keep the watch running.

A fully wound movement keeps running for a set time without movement. This is the power reserve. For common affordable movements it is roughly:

Movement	Found in	Power reserve	Hand-winding
Seiko NH35 / NH36 (4R35 / 4R36)	Seiko 5 Sports, Prospex, many microbrands	about 41 hours	Yes
Seiko 7S26	Older Seiko 5, SKX007/009	about 41 hours	No
Miyota 8215	Many budget automatics	about 42 hours	Yes
Orient F6922 / F6724	Orient Bambino, Kamasu, Mako	about 40 hours	Yes
ETA 2824-2	Many Swiss watches	about 38 hours	Yes
Powermatic 80	Tissot, Hamilton, Certina, Mido	about 80 hours	Yes

That is why a watch with a 40-hour reserve, left off the wrist on Friday evening, is usually stopped by Sunday morning. Nothing is wrong with it.

How to hand-wind an automatic watch, step by step

Wind only in position 0. Pulling the crown out and turning it moves the date or hands instead.

Take the watch off your wrist. Winding while wearing it puts sideways pressure on the crown stem, which can bend it over time.
Unscrew the crown if needed. Dive watches and many sports watches have a screw-down crown. Turn it counter-clockwise until it pops out gently. Do not pull it yet.
Stay in position 0 (the winding position). This is the crown's resting position, pushed fully in (or just released from the threads on a screw-down crown).
Turn the crown clockwise (away from you, with the watch facing up) in smooth, steady turns. Most movements wind only in this direction and slip harmlessly the other way.
Give it 30–40 turns from fully stopped. Around 20 turns starts it reliably. 30–40 turns brings most 40-hour movements close to a full reserve.
Set the time (see below), push the crown back in, and screw it down fully if it is a screw-down crown. This is essential for water resistance.

Can you overwind an automatic watch?

No. Unlike a manual-wind watch, where you feel the crown stop when the spring is full, an automatic mainspring is attached to the barrel with a slipping bridle. When the spring is full, it simply slips, so extra turns of the crown or rotor cannot damage it. You may hear or feel a faint change when it is full; that is normal.

What if my watch cannot be hand-wound?

Some movements, like the Seiko 7S26 and the older Seiko 7S36, have no hand-winding. To start them:

Hold the watch dial-up and gently rotate your wrist side to side for 30–60 seconds until the seconds hand moves.
Then wear it. Normal daily movement will build up the reserve over a few hours.
Avoid hard, jerky shaking. It does not wind faster and is not kind to the movement.

Setting the time correctly after winding

Pull the crown out to the time-setting position (the last click). On watches with a date, the middle click usually sets the date.
Many modern movements (NH35, Miyota 9015, Powermatic 80) hack, meaning the seconds hand stops while you set the time. This lets you sync to a reference clock.
Move the hands forward past 12 to check whether you are in AM or PM. If the date changes, you have just passed midnight.
Set the time and push the crown back in.

The "date danger zone"

On many watches with a date, do not change the date quick-set between roughly 9 pm and 3 am. During those hours the date-change gears are already engaged, and forcing the quick-set can damage them. Move the hands to around 6 o'clock first, set the date, then set the time. Check your manual: some movements are safe, but many are not.

The "date danger zone": the date mechanism is engaged roughly between 9 pm and 3 am.

How often should you wind it?

If you wear it daily (8+ hours with normal activity), you usually do not need to wind it at all.
If you have a desk job or wear it only a few hours, give it 10–20 turns each morning. A partly wound mainspring can make the watch run less accurately.
If you rotate several watches, just wind and set each one when you pick it up. Letting an automatic watch stop is not harmful.

Do you need a watch winder?

A watch winder is convenient if you own a watch with a complicated calendar that is tedious to reset. For a simple time-and-date automatic, it is optional. Letting the watch stop does not damage it, and keeping it running constantly does cause (slow) wear. If you use one, set it to the turns-per-day and direction your movement's manufacturer recommends.

Common mistakes to avoid

Forgetting to screw down a screw-down crown before swimming or washing your hands.
Pulling the crown out and winding in the time-setting position (it will just move the hands).
Changing the date in the 9 pm – 3 am window.
Winding while wearing the watch.
Assuming a stopped watch is broken. It is usually just out of power reserve.

If your watch runs but gains time, see Automatic Watch Running Fast? 6 Causes and Fixes.

FAQ

How many times should I turn the crown?

About 30–40 full turns from stopped is enough for most 40-hour movements. For an 80-hour Powermatic 80, around 40–60 turns gets you much closer to a full reserve.

Why does my automatic watch stop overnight?

Usually because it was not fully wound. A low-activity day may not wind it enough to last the night. Give it 20–30 turns before taking it off, or wear it longer.

Which way do you wind an automatic watch?

Clockwise, turning the crown away from you with the dial facing up. Turning it backwards does nothing on most automatics.

Is it bad to let an automatic watch stop?

No. Letting it stop does not harm the movement. Just wind and reset it when you wear it again.

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