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Watch accuracy calculator

Seconds per day from your watch's drift, and timegrapher readings against the calibre's spec. Example: TMI NH35, 12 s fast in 3 days = +4.0 s/day; on the timegrapher, within spec.

158 calibres with a published accuracy, lift angle or beat rate.

Published accuracy
−20 to +40 s/day[1]
Lift angle
53°[1]
Beat rate
21,600 bph[2][1]
Positional difference
not in our data

The source says: “- 20 ~ + 40 seconds per day”. Conditions: measured 10-60 min after full wind; without calendar in function; dial up / 9 o'clock up / 6 o'clock up; 20 s measurement time; Witschi WATCH EXPERT. Posture difference under 60 s (4 positions) and isochronism -20 to +40 s/day (24h-0h) also in TG

Gain or loss over days

The watch is

+4.0 s/day

Within spec. At this rate it is a minute off every 15 days.

published −20 to +40 s/day−30−20−100+10+20+30+40+50slowfast · s/day+4 s/day

Timegrapher readings

Calibre: 53°

Position

Within spec

  • Rate +8 s/day is inside the published −20 to +40 s/day.
  • Amplitude 270° (shown 265° at lift angle 52°, corrected to the calibre's 53°) is in the healthy band dial up (250° or more).
  • Beat error 0.4 ms is well adjusted (0.5 ms or less).
servicelowhealthyknock200°250°315°shown 265°true ≈ 270°

The same beat at other lift-angle settings

Your reading means the impulse took 10.43 ms at 21,600 bph. A timegrapher set to another angle turns that time into another amplitude:

Amplitude shown for each lift angle setting
Lift angle setAmplitude shown
48°245°
50°255°
52° (yours)265°
53° (calibre)270°
54°275°

How it works

Rate is the seconds gained or lost per day. A timegrapher measures it from the tick, and also times how long the impulse takes: from that time and the lift angle you set, it computes amplitude, the swing of the balance.

rate = seconds off ÷ days (×30 for a per-month spec) lift time t = 2·asin(L ÷ 2A) ÷ ω ω = 2π · bph ÷ 7200 shown A = L_set ÷ (2·sin(ω·t ÷ 2)) → true A = shown × L_calibre ÷ L_set

Worked example: 12 s ÷ 3 days = +4.0 s/day, inside the TMI NH35's −20 to +40 s/day[1]. On the timegrapher, 265° at a 52° setting means an impulse of 10.43 ms at 21,600 bph; at the calibre's 53°[1] the same time is 270°. With +8 s/day and 0.4 ms beat error the verdict is “within spec”.

Limits. Published accuracy is measured under the maker's conditions (static, set positions, temperature); on the wrist and over a day it varies, so compare like with like. Amplitude and beat-error bands are rules of thumb, not specs, and the lift-angle correction is only as good as the angle: where we have it from a secondary source, we say so. A phone microphone reads amplitude poorly. Verdicts are an estimate; a watchmaker's inspection decides a service.

Rules of thumb used for amplitude and beat error

A plain white-dial watch clamped in a timing microphone stand on a workshop bench by a window.

Calibre specs in our data

158 calibres with a published accuracy, lift angle or beat rate; mechanical first. Positional difference is an upper bound.

Published accuracy, lift angle, beat rate and positional difference by calibre
CalibreAccuracyLift angleBeat rate (bph)Positional diff.
TMI NH35−20 to +40 s/day[1]53°[1]21,600[2][1]—
Citizen 0200 (automatic)−3 to +5 s/day[3]—28,800[3]—
Citizen 0950 (automatic)−5 to +10 s/day[4]—28,800[4]—
Citizen 8200−20 to +40 s/day[5]—21,600[5]—
Citizen 8204 (automatic, Diver200M)−20 to +40 s/day[6]—21,600[6]—
Citizen 8210 (automatic, 82**)−20 to +40 s/day[5]—21,600[5]—
Citizen 8310 (automatic, 83**)−20 to +40 s/day[5]—21,600[5]—
Citizen 9011 (automatic, 901* family)−10 to +20 (no period given)[7]—28,800[7]—
Citizen 9051 (automatic)−10 to +20 s/day[8]—28,800[8]—
Dixmont DG2813——21,600[9]—
ETA 2671—49°[10]28,800[10]—
ETA 2824-2—50°[11]28,800[11]—
ETA 2836-2—50°[12]28,800[12]—
ETA 2892-A2—51°[13]28,800[13]—
ETA 2893-2—51°[14]28,800[14]—
Show 143 more rows
CalibreAccuracyLift angleBeat rate (bph)Positional diff.
ETA 2894-2——28,800[15]—
ETA C07.611 (Powermatic 80, regular escapement)——21,600[16]—
Hamilton H-10——21,600[17]—
Miyota 8205−20 to +40 s/day[18]49°[19]21,600[18][20]50 s/d[18]
Miyota 8215−20 to +40 s/day[21][22]49°[22]21,600[21][22][23]50 s/d[21][22]
Miyota 821A−20 to +40 s/day[24]49°[24]21,600[24]50 s/d[24]
Miyota 82S0−20 to +40 s/day[25]49°[26]21,600[25][20]50 s/d[25]
Miyota 82S5−20 to +40 s/day[27]49°[28]21,600[27][20]50 s/d[27]
Miyota 82S7−20 to +40 s/day[29]49°[30]21,600[29][20]50 s/d[29]
Miyota 8315—49°[31]21,600[31][20]50 s/d[31]
Miyota 8N24−20 to +40 s/day[32]49°[33]21,600[32][20]50 s/d[32]
Miyota 9015−10 to +30 s/day[34]51°[35]28,800[34][35][23]30 s/d[34][35]
Miyota 9039−10 to +30 s/day[36]51°[37]28,800[36][20]30 s/d[36]
Miyota 9075−10 to +30 s/day[38]51°[39]28,800[38]30 s/d[38]
Miyota 90S5−10 to +30 s/day[40]51°[41]28,800[40][20]30 s/d[40]
Miyota 9100−10 to +30 s/day[42]51°[43]28,800[42][20]30 s/d[42]
Miyota 9122−10 to +30 s/day[44]51°[45]28,800[44][20]30 s/d[44]
Orient F6922—52°[46] (secondary source)21,600[46]—
PT5000−12 to +12 s/day[47]50°[47] (secondary source)28,800[47][48]—
Seiko 4R34−35 to +45 s/day[49]53°[50] (secondary source)21,600[49]—
Seiko 4R35−35 to +45 s/day[51][52]—21,600[53][51][54]—
Seiko 4R36−35 to +45 s/day[51][52][55]—21,600[53][51][55]—
Seiko 4R38−35 to +45 s/day[56]—21,600[56]—
Seiko 4R57——21,600[57]—
Seiko 6309—54.5°[58] (secondary source)21,600[58][59]—
Seiko 6R15−15 to +25 s/day[60]—21,600[60]—
Seiko 6R35−15 to +25 s/day[61]—21,600[61]—
Seiko 6R55−15 to +25 s/day[62]—21,600[62]—
Seiko 7009—53°[63] (secondary source)21,600[63]—
Seiko 7S26——21,600[53][64]—
Seiko 7S36——21,600[65][66]—
Seiko 8L35−10 to +15 s/day[67]53°[68] (secondary source)28,800[67][68]—
Seiko 8R48−15 to +25 s/day[69]—28,800[69]—
Seiko 9R65 (Spring Drive)−15 to +15 s/month[70]———
Sellita SW200-1—50°[71]28,800[71]—
Sellita SW220-1−7 to +7 s/day[72]50°[72]28,800[72]20 s/d[72]
Sellita SW300-1−5 to +5 s/day[73]51°[73]28,800[73]20 s/d[73]
Sellita SW330-2−5 to +5 s/day[74]51°[74]28,800[74]20 s/d[74]
Sellita SW510−5 to +5 s/day[75]50°[75]28,800[75]20 s/d[75]
Tissot Powermatic 80−5 to +5 s/day[76]—21,600[76]—
TMI NH05——21,600[77]—
TMI NH26−25 to +35 s/day[64]—21,600[64]—
TMI NH34——21,600[2]—
TMI NH36——21,600[2]—
TMI NH38——21,600[78]—
TMI NH39——21,600[79]—
TMI NH70−20 to +40 s/day[80]53°[80]21,600[81]—
TMI NH72−20 to +40 s/day[82]53°[82]21,600[81]—
Casio module 2688−15 to +15 s/month[83]———
Casio module 3053−20 to +20 s/month[84]———
Casio module 3159−15 to +15 s/month[85]———
Casio module 3191−30 to +30 s/month[86]———
Casio module 3194−15 to +15 s/month[87]———
Casio module 3198−30 to +30 s/month[88]———
Casio module 3208−15 to +15 s/month[89]———
Casio module 3224−30 to +30 s/month[90]———
Casio module 3229−15 to +15 s/month[91]———
Casio module 3230−15 to +15 s/month[92]———
Casio module 3232−15 to +15 s/month[93]———
Casio module 3239−30 to +30 s/month[94]———
Casio module 3240−30 to +30 s/month[95]———
Casio module 3263−15 to +15 s/month[96]———
Casio module 3284−30 to +30 s/month[97]———
Casio module 3298−30 to +30 s/month[98]———
Casio module 3299−30 to +30 s/month[99]———
Casio module 3403−15 to +15 s/month[100]———
Casio module 3405−15 to +15 s/month[101]———
Casio module 3410−15 to +15 s/month[102]———
Casio module 3416−30 to +30 s/month[103]———
Casio module 3464−15 to +15 s/month[104]———
Casio module 3495−15 to +15 s/month[105]———
Casio module 3502−30 to +30 s/month[106]———
Casio module 3506−15 to +15 s/month[107]———
Casio module 3525−15 to +15 s/month[108]———
Casio module 5069−20 to +20 s/month[109]———
Casio module 5081−15 to +15 s/month[110]———
Casio module 5110−15 to +15 s/month[111]———
Casio module 5121−15 to +15 s/month[112]———
Casio module 5123−15 to +15 s/month[113]———
Casio module 5125−20 to +20 s/month[114]———
Casio module 5146−15 to +15 s/month[115]———
Casio module 5154−30 to +30 s/month[116]———
Casio module 5161−15 to +15 s/month[117]———
Casio module 5174−15 to +15 s/month[118]———
Casio module 5177−20 to +20 s/month[119]———
Casio module 5208−30 to +30 s/month[120]———
Casio module 5229−15 to +15 s/month[121]———
Casio module 5230−15 to +15 s/month[122]———
Casio module 5240−15 to +15 s/month[123]———
Casio module 5269−30 to +30 s/month[124]———
Casio module 5302−15 to +15 s/month[125]———
Casio module 5369−15 to +15 s/month[126]———
Casio module 5371−15 to +15 s/month[127]———
Casio module 5398−15 to +15 s/month[128]———
Casio module 5441−15 to +15 s/month[129]———
Casio module 5444−15 to +15 s/month[130]———
Casio module 5445−15 to +15 s/month[131]———
Casio module 5463−15 to +15 s/month[132]———
Casio module 5476−15 to +15 s/month[133]———
Casio module 5479−30 to +30 s/month[134]———
Casio module 5522−15 to +15 s/month[135]———
Casio module 5535−15 to +15 s/month[136]———
Casio module 5544−15 to +15 s/month[137]———
Casio module 5554−15 to +15 s/month[138]———
Casio module 5562−15 to +15 s/month[139]———
Casio module 5565−30 to +30 s/month[140]———
Casio module 5590−15 to +15 s/month[141]———
Casio module 5594−15 to +15 s/month[142]———
Casio module 5611−15 to +15 s/month[143]———
Casio module 5612−15 to +15 s/month[144]———
Casio module 5641−15 to +15 s/month[145]———
Casio module 5711−15 to +15 s/month[146]———
Casio module 5713−15 to +15 s/month[147]———
Casio module 593−30 to +30 s/month[148]———
Citizen 0510 (quartz chronograph)−20 to +20 s/month[149]———
Citizen A060 (Eco-Drive)−5 to +5 (no period given)[150]———
Citizen B612 (Eco-Drive chronograph)−15 to +15 s/month[151]———
Citizen B620 (Eco-Drive chronograph)−15 to +15 s/month[152]———
Citizen E111 (Eco-Drive)−15 to +15 s/month[153]———
Citizen E168 (Eco-Drive)−15 to +15 s/month[154]———
Citizen E650 (Eco-Drive, radio-controlled)−15 to +15 s/month[155]———
Citizen E660 (Eco-Drive, radio-controlled, world time)−15 to +15 s/month[156]———
Citizen E812 (Eco-Drive)−15 to +15 s/month[157]———
Citizen E820 (Eco-Drive)−15 to +15 s/month[158]———
Citizen E870 (Eco-Drive)−15 to +15 s/month[159]———
Citizen F150 (Eco-Drive, satellite)−5 to +5 s/month[160]———
Citizen H145 (Eco-Drive, radio-controlled)−15 to +15 s/month[161]———
Citizen H500 (Eco-Drive)−15 to +15 s/month[162]———
Citizen H610 (Eco-Drive, radio-controlled)−15 to +15 s/month[163]———
Citizen H800 (Eco-Drive, radio-controlled)−15 to +15 s/month[164]———
Citizen H804 (Eco-Drive, radio-controlled)−15 to +15 s/month[164]———
Citizen H820 (Eco-Drive, radio-controlled)−15 to +15 s/month[165]———
Citizen J800 (Eco-Drive)−15 to +15 s/month[166]———
Citizen J810 (Eco-Drive)−15 to +15 s/month[166]———
Citizen U600 (Eco-Drive, radio-controlled)−15 to +15 s/month[167]———
Citizen U680 (Eco-Drive, radio-controlled)−15 to +15 s/month[168]———
Miyota 0S20 (OS20)−20 to +20 s/month[169]———
Miyota 2035−20 to +20 s/month[170][171]———
Miyota 2315−20 to +20 s/month[172]———
Miyota 6S21−20 to +20 s/month[173]———
TMI VH31−15 to +15 s/month[174]———
TMI VK63−20 to +20 s/month[175]———
TMI VK64−20 to +20 s/month[176]———

Questions

How accurate is the TMI NH35 supposed to be?

Its maker publishes −20 to +40 s/day as static accuracy (measured 10-60 min after full wind; without calendar in function; dial up / 9 o'clock up / 6 o'clock up; 20 s measurement time; Witschi WATCH EXPERT). Its lift angle is 53° and it beats at 21,600 bph.

[1][2]

Is +20 seconds a day normal for a Seiko 4R36?

Yes: Seiko gives the Seiko 4R36 −35 to +45 s/day, so +20 s/day is inside it. Anything faster than +45 or slower than −35 s/day is outside the published range.

[51][52][55]

What is a good timegrapher amplitude?

Fully wound and dial up, a serviced movement is usually quoted at roughly 250–300°; under 200° is the common sign it needs a service, and over about 315° the balance may be knocking. In vertical positions expect 20–40° less.

These are workshop rules of thumb from two public guides, not maker specs: none of the 63 mechanical calibres in our data has a published amplitude, and one guide notes a modern Seiko may run near 230° from the factory.

What lift angle should I set on my timegrapher?

The calibre's own: TMI NH35 53°, Miyota 8215 49°, Miyota 9015 51°, ETA 2824-2 50°, Sellita SW200-1 50°, Seiko 4R34 53° (secondary source), Seiko 6309 54.5° (secondary source).

30 mechanical calibres in our data have no lift angle yet, among them Citizen 0200 (automatic), Citizen 0950 (automatic), Citizen 8200; for those, rate and beat error are still exact, only amplitude is uncertain.

[1][22][35][11][71][50][58]

How much does a wrong lift angle change the amplitude reading?

In proportion: true amplitude = shown × calibre angle ÷ set angle. A TMI NH35 read at 52° instead of 53° shows 265° for a true 270°. A Miyota 8215 (49°) read at 52° showing 265° is really about 250°, 15° less than displayed. Rate and beat error don't depend on the setting.

[1][22]

How do I measure my watch’s accuracy without a timegrapher?

Set it against a reference clock, wear it as usual, and note how many seconds it is ahead or behind after a few days; seconds ÷ days is the rate. 12 s ahead after 3 days is +4.0 s/day.

Quartz specs are usually per month: 66 of the 94 quartz calibres and Casio modules in our data with a monthly figure are rated ±15 s/month, about ±0.5 s/day.

More tools

Sources

Documents checked · Report a wrong number

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