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Gear Ratios by Spur Gear Size

Locate the spur gear size you want to know the ratios for then find the pinion gear size in the left column of that table. The ratio value is in the box to the right of the pinion gear. If the sizes you wish to know the ratios for are not here simply divide the spur gear teeth by the pinion teeth. The ratio is the number of revolutions the pinion gear makes for every one revolution of the spur gear.

32 Pitch

Pinion	54 Tooth Spur
9T	6.00
10T	5.40
11T	4.90
12T	4.50
13T	4.15
14T	3.85
15T	3.60
16T	3.37
17T	3.17
18T	3.00
19T	2.84
20T	2.80
21T	2.70
22T	2.57
23T	2.45
24T	2.34

Pinion	56 Tooth Spur
9T	6.22
10T	5.60
11T	5.09
12T	4.66
13T	4.30
14T	4.00
15T	3.73
16T	3.50
17T	3.29
18T	3.11
19T	2.94
20T	2.80
21T	2.66
22T	2.54
23T	2.43
24T	2.33

Pinion	58 Tooth Spur
9T	6.44
10T	5.80
11T	5.27
12T	4.83
13T	4.46
14T	4.14
15T	3.86
16T	3.62
17T	3.41
18T	3.22
19T	3.05
20T	2.90
21T	2.76
22T	2.63
23T	2.52
24T	2.41

Pinion	60 Tooth Spur
9T	6.66
10T	6.00
11T	5.45
12T	5.00
13T	4.61
14T	4.28
15T	4.00
16T	3.75
17T	3.52
18T	3.33
19T	3.15
20T	3.00
21T	2.85
22T	2.72
23T	2.60
24T	2.50

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48 Pitch

Pinion	72 Tooth Spur
12T	6.00
13T	5.53
14T	5.14
15T	4.80
16T	4.50
17T	4.23
18T	4.00
19T	3.78
20T	3.60
21T	3.42
22T	3.27
23T	3.13
24T	3.00
25T	2.88
26T	2.76
27T	2.66
28T	2.57
29T	2.48
30T	2.40

Pinion	75 Tooth Spur
12T	6.25
13T	5.76
14T	5.35
15T	5.00
16T	4.68
17T	4.41
18T	4.16
19T	3.94
20T	3.75
21T	3.57
22T	3.40
23T	3.26
24T	3.12
25T	3.00
26T	2.88
27T	2.77
28T	2.67
29T	2.58
30T	2.50

Pinion	78 Tooth Spur
12T	6.50
13T	6.00
14T	5.57
15T	5.20
16T	4.87
17T	4.58
18T	4.33
19T	4.10
20T	3.90
21T	3.71
22T	3.54
23T	3.39
24T	3.25
25T	3.12
26T	3.00
27T	2.88
28T	2.78
29T	2.69
30T	2.60

Pinion	81 Tooth Spur
12T	6.75
13T	6.23
14T	5.78
15T	5.40
16T	5.06
17T	4.76
18T	4.50
19T	4.26
20T	4.05
21T	3.85
22T	3.68
23T	3.52
24T	3.37
25T	3.24
26T	3.11
27T	3.00
28T	2.89
29T	2.79
30T	2.70

48 Pitch

Pinion	85 Tooth Spur
12T	7.08
13T	6.53
14T	6.07
15T	5.66
16T	5.31
17T	5.00
18T	4.72
19T	4.47
20T	4.25
21T	4.04
22T	3.86
23T	3.69
24T	3.54
25T	3.40
26T	3.27
27T	3.14
28T	3.03
29T	2.93
30T	2.83

Pinion	87 Tooth Spur
12T	7.25
13T	6.69
14T	6.21
15T	5.80
16T	5.43
17T	5.11
18T	4.83
19T	4.57
20T	4.35
21T	4.14
22T	3.95
23T	3.78
24T	3.62
25T	3.48
26T	3.34
27T	3.22
28T	3.10
29T	3.00
30T	2.90

Pinion	90 Tooth Spur
12T	7.50
13T	6.92
14T	6.42
15T	6.00
16T	5.62
17T	5.29
18T	5.00
19T	4.73
20T	4.50
21T	4.28
22T	4.09
23T	3.91
24T	3.75
25T	3.60
26T	3.46
27T	3.33
28T	3.21
29T	3.10
30T	3.00

Pinion	93 Tooth Spur
12T	7.75
13T	7.15
14T	6.64
15T	6.20
16T	5.81
17T	5.47
18T	5.16
19T	4.89
20T	4.65
21T	4.42
22T	4.22
23T	4.04
24T	3.87
25T	3.72
26T	3.57
27T	3.44
28T	3.32
29T	3.20
30T	3.10

Pinion	96 Tooth Spur
12T	8.00
13T	7.38
14T	6.85
15T	6.40
16T	6.00
17T	5.64
18T	5.33
19T	5.05
20T	4.80
21T	4.57
22T	4.36
23T	4.17
24T	4.00
25T	3.84
26T	3.69
27T	3.56
28T	3.43
29T	3.31
30T	3.20

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64 Pitch

Pinion	100 Tooth Spur
20T	5.00
21T	4.76
22T	4.55
23T	4.35
24T	4.17
25T	4.00
26T	3.85
27T	3.70
28T	3.57
29T	3.45
30T	3.33
31T	3.23
32T	3.13
33T	3.03
34T	2.94
35T	2.86
36T	2.78
37T	2.70
38T	2.63
39T	2.56
40T	2.50

Pinion	104 Tooth Spur
20T	5.20
21T	4.95
22T	4.72
23T	4.52
24T	4.33
25T	4.16
26T	4.00
27T	3.85
28T	3.71
29T	3.58
30T	3.46
31T	3.35
32T	3.25
33T	3.15
34T	3.05
35T	2.97
36T	2.88
37T	2.81
38T	2.73
39T	2.66
40T	2.60

Pinion	108 Tooth Spur
20T	5.40
21T	5.14
22T	4.91
23T	4.70
24T	4.50
25T	4.32
26T	4.15
27T	4.00
28T	3.86
29T	3.72
30T	3.60
31T	3.48
32T	3.38
33T	3.27
34T	3.18
35T	3.09
36T	3.00
37T	2.91
38T	2.84
39T	2.77
40T	2.70

Pinion	111 Tooth Spur
20T	5.50
21T	5.28
22T	5.04
23T	4.82
24T	4.62
25T	4.44
26T	4.27
27T	4.11
28T	3.96
29T	3.82
30T	3.70
31T	3.58
32T	3.46
33T	3.36
34T	3.26
35T	3.17
36T	3.08
37T	3.00
38T	2.92
39T	2.84
40T	2.77

64 Pitch

Pinion	115 Tooth Spur
20T	5.75
21T	5.48
22T	5.23
23T	5.00
24T	4.79
25T	4.60
26T	4.42
27T	4.26
28T	4.11
29T	3.97
30T	3.83
31T	3.71
32T	3.59
33T	3.49
34T	3.38
35T	3.29
36T	3.19
37T	3.10
38T	3.02
39T	2.94
40T	2.87

Pinion	118 Tooth Spur
20T	5.90
21T	5.62
22T	5.36
23T	5.13
24T	4.91
25T	4.72
26T	4.53
27T	4.37
28T	4.21
29T	4.06
30T	3.93
31T	3.80
32T	3.68
33T	3.57
34T	3.47
35T	3.37
36T	3.27
37T	3.19
38T	3.10
39T	3.02
40T	2.95

Pinion	120 Tooth Spur
20T	6.00
21T	5.71
22T	5.46
23T	5.22
24T	5.00
25T	4.80
26T	4.62
27T	4.44
28T	4.29
29T	4.14
30T	4.00
31T	3.87
32T	3.75
33T	3.64
34T	3.53
35T	3.43
36T	3.33
37T	3.24
38T	3.15
39T	3.07
40T	3.00

Pinion	125 Tooth Spur
20T	6.25
21T	5.95
22T	5.68
23T	5.44
24T	5.21
25T	5.00
26T	4.81
27T	4.63
28T	4.46
29T	4.31
30T	4.17
31T	4.03
32T	3.91
33T	3.79
34T	3.68
35T	3.57
36T	3.47
37T	3.37
38T	3.29
39T	3.20
40T	3.12

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