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

Pinion54 Tooth Spur
9T6.00
10T5.40
11T4.90
12T4.50
13T4.15
14T3.85
15T3.60
16T3.37
17T3.17
18T3.00
19T2.84
20T2.80
21T2.70
22T2.57
23T2.45
24T2.34
Pinion56 Tooth Spur
9T6.22
10T5.60
11T5.09
12T4.66
13T4.30
14T4.00
15T3.73
16T3.50
17T3.29
18T3.11
19T2.94
20T2.80
21T2.66
22T2.54
23T2.43
24T2.33
Pinion58 Tooth Spur
9T6.44
10T5.80
11T5.27
12T4.83
13T4.46
14T4.14
15T3.86
16T3.62
17T3.41
18T3.22
19T3.05
20T2.90
21T2.76
22T2.63
23T2.52
24T2.41
Pinion 60 Tooth Spur
9T6.66
10T6.00
11T5.45
12T5.00
13T4.61
14T4.28
15T4.00
16T3.75
17T3.52
18T3.33
19T3.15
20T3.00
21T2.85
22T2.72
23T2.60
24T2.50

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48 Pitch

Pinion72 Tooth Spur
12T6.00
13T5.53
14T5.14
15T4.80
16T4.50
17T4.23
18T4.00
19T3.78
20T3.60
21T3.42
22T3.27
23T3.13
24T3.00
25T2.88
26T2.76
27T2.66
28T2.57
29T2.48
30T2.40
Pinion75 Tooth Spur
12T6.25
13T5.76
14T5.35
15T5.00
16T4.68
17T4.41
18T4.16
19T3.94
20T3.75
21T3.57
22T3.40
23T3.26
24T3.12
25T3.00
26T2.88
27T2.77
28T2.67
29T2.58
30T2.50
Pinion78 Tooth Spur
12T6.50
13T6.00
14T5.57
15T5.20
16T4.87
17T4.58
18T4.33
19T4.10
20T3.90
21T3.71
22T3.54
23T3.39
24T3.25
25T3.12
26T3.00
27T2.88
28T2.78
29T2.69
30T2.60
Pinion81 Tooth Spur
12T6.75
13T6.23
14T5.78
15T5.40
16T5.06
17T4.76
18T4.50
19T4.26
20T4.05
21T3.85
22T3.68
23T3.52
24T3.37
25T3.24
26T3.11
27T3.00
28T2.89
29T2.79
30T2.70

48 Pitch

Pinion85 Tooth Spur
12T7.08
13T6.53
14T6.07
15T5.66
16T5.31
17T5.00
18T4.72
19T4.47
20T4.25
21T4.04
22T3.86
23T3.69
24T3.54
25T3.40
26T3.27
27T3.14
28T3.03
29T2.93
30T2.83
Pinion87 Tooth Spur
12T7.25
13T6.69
14T6.21
15T5.80
16T5.43
17T5.11
18T4.83
19T4.57
20T4.35
21T4.14
22T3.95
23T3.78
24T3.62
25T3.48
26T3.34
27T3.22
28T3.10
29T3.00
30T2.90
Pinion90 Tooth Spur
12T7.50
13T6.92
14T6.42
15T6.00
16T5.62
17T5.29
18T5.00
19T4.73
20T4.50
21T4.28
22T4.09
23T3.91
24T3.75
25T3.60
26T3.46
27T3.33
28T3.21
29T3.10
30T3.00
Pinion93 Tooth Spur
12T7.75
13T7.15
14T6.64
15T6.20
16T5.81
17T5.47
18T5.16
19T4.89
20T4.65
21T4.42
22T4.22
23T4.04
24T3.87
25T3.72
26T3.57
27T3.44
28T3.32
29T3.20
30T3.10
Pinion96 Tooth Spur
12T8.00
13T7.38
14T6.85
15T6.40
16T6.00
17T5.64
18T5.33
19T5.05
20T4.80
21T4.57
22T4.36
23T4.17
24T4.00
25T3.84
26T3.69
27T3.56
28T3.43
29T3.31
30T3.20

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64 Pitch

Pinion100 Tooth Spur
20T5.00
21T4.76
22T4.55
23T4.35
24T4.17
25T4.00
26T3.85
27T3.70
28T3.57
29T3.45
30T3.33
31T3.23
32T3.13
33T3.03
34T2.94
35T2.86
36T2.78
37T2.70
38T2.63
39T2.56
40T2.50
Pinion104 Tooth Spur
20T5.20
21T4.95
22T4.72
23T4.52
24T4.33
25T4.16
26T4.00
27T3.85
28T3.71
29T3.58
30T3.46
31T3.35
32T3.25
33T3.15
34T3.05
35T2.97
36T2.88
37T2.81
38T2.73
39T2.66
40T2.60
Pinion108 Tooth Spur
20T5.40
21T5.14
22T4.91
23T4.70
24T4.50
25T4.32
26T4.15
27T4.00
28T3.86
29T3.72
30T3.60
31T3.48
32T3.38
33T3.27
34T3.18
35T3.09
36T3.00
37T2.91
38T2.84
39T2.77
40T2.70
Pinion111 Tooth Spur
20T5.50
21T5.28
22T5.04
23T4.82
24T4.62
25T4.44
26T4.27
27T4.11
28T3.96
29T3.82
30T3.70
31T3.58
32T3.46
33T3.36
34T3.26
35T3.17
36T3.08
37T3.00
38T2.92
39T2.84
40T2.77

64 Pitch

Pinion115 Tooth Spur
20T5.75
21T5.48
22T5.23
23T5.00
24T4.79
25T4.60
26T4.42
27T4.26
28T4.11
29T3.97
30T3.83
31T3.71
32T3.59
33T3.49
34T3.38
35T3.29
36T3.19
37T3.10
38T3.02
39T2.94
40T2.87
Pinion118 Tooth Spur
20T5.90
21T5.62
22T5.36
23T5.13
24T4.91
25T4.72
26T4.53
27T4.37
28T4.21
29T4.06
30T3.93
31T3.80
32T3.68
33T3.57
34T3.47
35T3.37
36T3.27
37T3.19
38T3.10
39T3.02
40T2.95
Pinion120 Tooth Spur
20T6.00
21T5.71
22T5.46
23T5.22
24T5.00
25T4.80
26T4.62
27T4.44
28T4.29
29T4.14
30T4.00
31T3.87
32T3.75
33T3.64
34T3.53
35T3.43
36T3.33
37T3.24
38T3.15
39T3.07
40T3.00
Pinion125 Tooth Spur
20T6.25
21T5.95
22T5.68
23T5.44
24T5.21
25T5.00
26T4.81
27T4.63
28T4.46
29T4.31
30T4.17
31T4.03
32T3.91
33T3.79
34T3.68
35T3.57
36T3.47
37T3.37
38T3.29
39T3.20
40T3.12

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