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Oring size calculator

Oring Size Calculator

To use this tool, simply enter 2 known dimensions (CS, ID, or OD). The other dimension will calculate and the associated tolerances will be shown below. Then, click the Global Size to find possible matching items in our store. Dimensional tolerances for all metric o-rings offered by Global O-Ring and Seal are in accordance with ISO 3601-1B.
NOTE: you can select your tolerance range (+/- %) in the store. Our tolerances are only meant to serve as a guide. You should always select a size that you feel comfortable will work for your application.
SizeToleranceLowHigh
Cross Section (mm)
Inside Diameter (mm)
Outside Diameter (mm)
Global Size

Dimensional Tolerances of Metric O-Rings

Cross Section (mm)Tolerance (mm)
≤ 2.62± 0.08
2.63 – 3.00± 0.09
3.01 – 4.50± 0.10
4.51 – 5.50± 0.13
5.51 – 7.50± 0.15
7.51 – 8.50± 0.18
8.51 – 10.0± 0.20
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I.D. (mm)Tolerance (mm)
1.80 – 2.79± 0.13
2.80 – 4.86± 0.14
4.87 – 6.69± 0.15
6.70 – 8.75± 0.16
8.76 – 10.59± 0.17
10.5 – 11.79± 0.18
11.8 – 14.99± 0.19
15.0 – 16.99± 0.20
17.0 – 18.99± 0.21
19.0 – 21.19± 0.22
21.2 – 22.39± 0.23
22.4 – 24.99± 0.24
25.0 – 25.79± 0.25
25.8 – 27.99± 0.26
28.0 – 29.99± 0.28
30.0 – 31.49± 0.29
31.5 – 32.49± 0.31
32.5 – 34.49± 0.32
34.5 – 35.49± 0.33
35.5 – 36.49± 0.34
36.5 – 37.49± 0.35
37.5 – 38.59± 0.36
38.7 – 39.99± 0.37
40.0 – 41.19± 0.38
41.2 – 42.49± 0.39
42.5 – 43.69± 0.40
43.7 – 44.99± 0.41
45.0 – 46.19± 0.42
46.2 – 47.49± 0.43
47.5 – 48.69± 0.44
48.7 – 49.99± 0.45
50.0 – 51.49± 0.46
51.5 – 52.99± 0.47
53.0 – 54.49± 0.48
54.5 – 55.99± 0.50
56.0 – 57.99± 0.51
58.0 – 59.99± 0.52
60.0 – 61.49± 0.54
61.5 – 62.99± 0.55
63.0 – 64.99± 0.58
65.0 – 68.99± 0.58
67.0 – 68.99± 0.59
69.0 – 70.99± 0.61
71.0 – 72.99± 0.63
73.0 – 74.99± 0.64
75.0 – 77.49± 0.66
77.5 – 79.99± 0.67
80.0 – 82.49± 0.69
82.5 – 84.99± 0.71
85.0 – 87.49± 0.73
87.5 – 89.99± 0.75
90.0 – 92.49± 0.77
92.5 – 94.99± 0.79
95.0 – 97.49± 0.81
97.5 – 99.99± 0.83
100 – 102.9± 0.84
103 – 105.9± 0.87
106 – 108.9± 0.89
109 – 111.9± 0.91
112 – 114.9± 0.93
115 – 117.9± 0.95
118 – 121.9± 0.97
122 – 124.9± 1.00
125 – 127.9± 1.03
128 – 131.9± 1.05
132 – 135.9± 1.08
136 – 139.9± 1.10
140 – 144.9± 1.13
145 – 149.9± 1.17
150 – 154.9± 1.20
155 – 159.9± 1.24
160 – 164.9± 1.27
165 – 169.9± 1.31
170 – 174.9± 1.34
175 – 179.9± 1.38
180 – 184.9± 1.41
185 – 189.9± 1.44
190 – 194.9± 1.48
195 – 199.9± 1.51
200 – 205.9± 1.55
206 – 211.9± 1.59
212 – 217.9± 1.63
218 – 223.9± 1.67
224 – 229.9± 1.71
230 – 235.9± 1.75
236 – 242.9± 1.79
243 – 249.9± 1.83
250 – 257.9± 1.88
258 – 264.9± 1.93
265 – 271.9± 1.98
272 – 279.9± 2.02
280 – 289.9± 2.08
290 – 299.9± 2.14
300 – 306.9± 2.21
307 – 314.9± 2.25
315 – 324.9± 2.30
325 – 334.9± 2.37
335 – 344.9± 2.43
345 – 354.9± 2.49
355 – 364.9± 2.56
365 – 374.9± 2.62
375 – 386.9± 2.68
387 – 399.9± 2.78
400 – 411.9± 2.84
412 – 424.9± 2.91
425 – 436.9± 2.99
437 – 449.9± 3.07
450 – 461.9± 3.15
462 – 474.9± 3.22
475 – 486.9± 3.30
487 – 499.9± 3.37
500 – 514.9± 3.45
515 – 529.9± 3.54
530 – 544.9± 3.63
545 – 559.9± 3.72
560 – 579.9± 3.81
580 – 599.9± 3.93
600 – 614.9± 4.05
615 – 629.9± 4.13
630 – 649.9± 4.22
650 – 669.9± 4.34
670 – 689.9± 4.46
≥ 690± 0.65%
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