What TPD should I set my watch winder to?

TPD, turns per day, is the number of full rotations a watch winder gives the watch in 24 hours. The right figure is the lowest one that keeps your movement fully wound, and the right direction is the one its rotor winds in. Get the direction wrong and no number will save it.

Two answers circulate. One says set 650 bidirectional and forget it, which is the baseline Barrington gives: "For most watches, 650 TPD in bidirectional mode is an excellent baseline starting point." The other says every watch has an exact manufacturer figure you must look up. The first is right for most watches and wrong for an identifiable minority. The second promises something that mostly does not exist. The tables online are winder makers' tables, and Barrington says of its own that its figures "should therefore be treated as practical starting points rather than strict manufacturer specifications." Below, the largest of those tables, Orbita's, sits next to the movement facts that explain it.

The settings, caliber by caliber

Orbita's watch database lists brand, model, caliber, turn direction and turns per day for 10,573 watches. Searched by brand, the same caliber turns up under dozens of names. Here it is regrouped by movement, with the entries behind each line.

Three patterns stand out. First, the database is consistent where it has volume: the ETA automatics are bidirectional at 650 and the 7750 chronographs clockwise at 800, whatever the brand on the dial. If your watch is "Base ETA 2824-2" or "Base Valjoux 7750", you do not need to find the model.

Second, one-way movements are not all one way in the same direction. The 7750 and the Miyota 9015 are listed clockwise, the Miyota 8215 and Patek's micro-rotor and central-rotor calibers counterclockwise. "Unidirectional" on a spec sheet does not tell you which way to set the winder.

Third, the high figures belong to a few brands: IWC's 5000 series at 1,000, Panerai's P.9000 and Jaeger-LeCoultre's automatics up to 950. These are the watches a 650 default may let run down.

What the whole database shows

Of the 10,573 entries, 9,560 give both a direction and a figure; the rest are blank, notes or "TBD". Of those 9,560, 5,535 are "Both", 2,901 clockwise, 1,102 counterclockwise and 22 "Uni" without a direction. The starting figures are even more concentrated: 5,329 start at 650 and 3,481 at 800, together 92% of the database.

The edges are wide: Blancpain's Calibre 25 tourbillon at 231 to 500 TPD, Breguet's Calibre 555 at 1,300, Jaeger-LeCoultre's calibre 975H at 1,350. If you own one of those, look it up. For everyone else, the database is two numbers and three directions.

That matches the daily need our answer on how often to wind an automatic gives: roughly 650 to 800 rotor turns a day.

Direction matters more than the number

A bidirectional movement winds whichever way the rotor turns. The ETA 2824-2 and Sellita SW200-1 do it with a pair of reversing wheels. Seiko does it with the Magic Lever, developed in 1959, which its museum describes as moving "up or down regardless of whether the rotor turns clockwise or anticlockwise", so that the transmission wheel always turns one way; our NH35 page covers the current version. Set any of these to "Both" and every turn of the drum winds.

A one-way movement winds on one direction of rotor travel and freewheels on the other. Our page on the Valjoux 7750 traces this to its single reversing wheel, and the Miyota 8215 and Miyota 9015 pages cover the same behaviour. LIV, which builds watches on the 7750, spells out the cost: "A bidirectional setting of 800 TPD would only deliver roughly 400 actual winding turns, which may not be enough to keep the watch fully wound, especially with the chronograph running." Its fix, if a winder cannot be set to one direction, is "approximately 1,600 bidirectional to get ~800 effective clockwise turns".

So Both is safe for every movement but halves the useful turns on a one-way caliber, and a one-way setting in the wrong direction winds nothing at all. Unsure? Use Both. Sure it is one-way? Set its direction.

The labels add a trap of their own. LIV describes the 7750 as winding when the rotor turns "clockwise, as viewed from the caseback", and sets the winder to clockwise. Those agree. When the drum turns, the rotor's weight keeps it hanging still while the movement turns around it, so relative to the movement the rotor turns the opposite way to the drum. Viewed from the back, that reverses again, so a drum turning clockwise as you face the dial therefore moves the rotor clockwise as seen through the caseback. If a one-way watch runs down on a correct-looking setting, try the other direction before raising the number.

Check how your winder counts a turn

TPD is not used as a fixed unit. Orbita's database uses "Both" to mean a model "will wind going CW or CCW", and gives one figure. Wolf's product specification says its winders "can be set between 300 and 1,200 TPD" and then: "Double the amount of TPD by selecting bi-directional setting". On a Wolf, 800 bidirectional means 1,600 rotations a day. On a winder that counts the total, it means 800.

Swiss Kubik works on a different scale altogether. Its Startbox "performs 1,600 revolutions per day", and the Masterbox ships set to 1,600, reprogrammable by app. That is double Orbita's figure for a 7750 and two and a half times its figure for an ETA 2824-2.

None of this harms a healthy automatic. Once the mainspring is full, its bridle slips in the barrel, as our answer on overwinding explains. A high setting costs running hours, not a broken spring; a low one leaves the watch in the weak end of its power reserve. Check what your winder's number counts, then translate.

Rolex, and the Daytona disagreement

Rolex is the brand most people search for, and the tables do not agree on it. Orbita lists "Most Rolex Movements" as Both, 650, and the Daytona's calibre 4130 as Both, 650 to 800. Barrington lists the Daytona at 650 to 800, bidirectional. Rotation Horlogère lists the 4130 as "Clockwise only" at 800 to 950, and gives a "General Rolex Recommendation" of 850 in the same table where almost every Rolex reference reads 650.

The clockwise-only line is the odd one out. Grail Watch's movement reference describes the 4130 as a "self-winding chronograph movement, rotor bi-directional winding", and our calibre 3235 page records the current Rolex movement as bidirectional too. Rotation Horlogère says its page compiles "all the officially recommended TPD data", yet it also says its values "correspond to the generally accepted recommendations within the watchmaking community". None of the three tables cites a Rolex document. Set a Rolex, Daytona included, to Both at 650, and move to 800 if it runs down.

Seiko is the one maker figure we found

The only entries in Orbita's database attributed to a watch company are Seiko's. Citing Seiko USA's technical customer service, it says Seiko's mechanical automatics "have a bi-directional wind, a 36-48 hour Power reserve, and probably require 500-700 TPD." For Spring Drive it gives Seiko's figure that "approximately 1,500 turns by a watch winder can generate power for 3-day movement; in other words, about 500 turns are required for the necessary power of one-day movt.", and adds that any position and both directions work. For Kinetic, it reports Seiko USA's view that winders are not recommended, because the movement has no mainspring.

Note the word "probably": a working estimate, not a test result, and below the 650 most tables start at. For a 4R36, NH35 or 6R35, 650 bidirectional is already generous. The 9R Spring Drive page covers the other system.

How to set it and test it

1. Identify the caliber from the specification, then read your line off the table above.
2. Wind it by hand first. A winder keeps a watch wound; it is slow to fill a stopped one. Give it the 30 to 40 crown turns in our answer on how many turns to wind a watch, then set the time.
3. Set the direction. Both for a bidirectional movement; the movement's own direction for a one-way caliber.
4. Set the figure. 650 for Both, 800 for one-way, translated for how your winder counts. Higher only for the listed exceptions.
5. Test for 48 hours. Barrington's method: if the watch has stopped or lost time, raise the setting "by 100 TPD at a time" and test again. Stop the chronograph before you put it in; LIV notes that a running chronograph raises the power draw.

A timegrapher gives a firmer check than the time alone. Amplitude falls as the mainspring runs down, so a watch that reads well when hand wound and noticeably lower after two days on the winder is not being kept full. Our answer on a good amplitude gives the figures to compare against.

When this answer stops applying

• The watch is quartz, Kinetic or hand wound. Quartz and Kinetic gain nothing from a winder, and a hand-wound watch has no rotor for it to turn.
• The caliber is newer than the tables. Orbita lists the Omega 9300 and Rolex 4160 as "TBD", and newer families such as Omega's 8800 and 8900 are not listed by number at all. Use the direction rule and start at 650.
• The watch is an outlier. Tourbillons, IWC's 5000 series, Breguet's 555 and some Jaeger-LeCoultre calibers sit outside the 650 to 800 band.
• The watch is vintage or overdue a service. Running it continuously on old oil is the case against a winder, set out in our answer on whether you need one.

For everything else, the setting fits on one line: Both at 650 for a movement that winds both ways, its own direction at 800 for one that does not, and 100 more if it runs down in two days.