Metric to Imperial Conversion

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Written By Terrance Luckett

This Metric to Imperial conversion chart rounds fractions to the nearest NIST standard.

Metric to Imperial Formula

Millimeter to Inches Calculator

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Metric/Imperial Conversion Chart

A B C
1
 Millimeters Inches Inches (Fraction)
2
 0.25 0.00984252 1/128
3
 0.5 0.019685 1/64
4
 0.75 0.0295276 1/32
5
 1 0.0393701 3/64
6
 1.25 0.0492126 1/16
7
 1.5 0.0590551 5/64
8
 1.75 0.0688976 3/32
9
 2 0.0787402 7/64
10
 2.25 0.0885827 1/8
11
 2.5 0.0984252 9/64
12
 2.75 0.108268 5/32
13
 3 0.11811 11/64
14
 3.25 0.127953 3/16
15
 3.5 0.137795 13/64
16
 3.75 0.147638 7/32
17
 4 0.15748 15/64
18
 4.25 0.167323 1/4
19
 4.5 0.177165 17/64
20
 4.75 0.187008 9/32
21
 5 0.19685 19/64
22
 5.25 0.206693 5/16
23
 5.5 0.216535 21/64
24
 5.75 0.226378 11/32
25
 6 0.23622 23/64
26
 6.25 0.246063 3/8
27
 6.5 0.255906 25/64
28
 6.75 0.265748 13/32
29
 7 0.275591 27/64
30
 7.25 0.285433 7/16
31
 7.5 0.295276 29/64
32
 7.75 0.305118 15/32
33
 8 0.314961 31/64
34
 8.25 0.324803 1/2
35
 8.5 0.334646 33/64
36
 8.75 0.344488 17/32
37
 9 0.354331 35/64
38
 9.25 0.364173 9/16
39
 9.5 0.374016 37/64
40
 9.75 0.383858 19/32
41
 10 0.393701 39/64
42
 10.25 0.403543 5/8
43
 10.5 0.413386 41/64
44
 10.75 0.423228 21/32
45
 11 0.433071 43/64
46
 11.25 0.442913 11/16
47
 11.5 0.452756 45/64
48
 11.75 0.462598 23/32
49
 12 0.472441 47/64
50
 12.25 0.482283 3/4
51
 12.5 0.492126 49/64
52
 12.75 0.501969 25/32
53
 13 0.511811 51/64
54
 13.25 0.521654 13/16
55
 13.5 0.531496 53/64
56
 13.75 0.541339 27/32
57
 14 0.551181 55/64
58
 14.25 0.561024 7/8
59
 14.5 0.570866 57/64
60
 14.75 0.580709 29/32
61
 15 0.590551 59/64
62
 15.25 0.600394 15/16
63
 15.5 0.610236 61/64
64
 15.75 0.620079 31/32
65
 16 0.629921 63/64
66
 16.25 0.639764 1
67
 16.5 0.649606 1 1/64
68
 16.75 0.659449 1 1/32
69
 17 0.669291 1 3/64
70
 17.25 0.679134 1 1/16
71
 17.5 0.688976 1 5/64
72
 17.75 0.698819 1 3/32
73
 18 0.709 11/16
74
 18.25 0.719 3/4
75
 18.5 0.728 3/4
76
 18.75 0.738 3/4
77
 19 0.748 3/4
78
 19.25 0.758 13/16
79
 19.5 0.768 13/16
80
 19.75 0.778 13/16
81
 20 0.787 13/16
82
 20.25 0.797 25/32
83
 20.5 0.807 25/32
84
 20.75 0.817 13/16
85
 21 0.827 53/64
86
 21.25 0.837 53/64
87
 21.5 0.846 53/64
88
 21.75 0.856 7/8
89
 22 0.866 7/8
90
 22.25 0.876 7/8
91
 22.5 0.886 7/8
92
 22.75 0.896 57/64
93
 23 0.906 57/64
94
 23.25 0.915 15/16
95
 23.5 0.925 15/16
96
 23.75 0.935 15/16
97
 24 0.945 61/64
98
 24.25 0.955 61/64
99
 24.5 0.965 31/32
100
 24.75 0.974 31/32
101
 25 0.984 63/64
102
 25.25 0.994 1
103
 25.5 1.004 1
104
 25.75 1.014 1 1/32
105
 26 1.024 1 1/32
106
 26.25 1.033 1 1/32
107
 26.5 1.043 1 3/32
108
 26.75 1.053 1 3/32
109
 27 1.063 1 3/32
110
 27.25 1.073 1 1/8
111
 27.5 1.083 1 1/8
112
 27.75 1.093 1 5/32
113
 28 1.102 1 5/32
114
 28.25 1.112 1 3/16
115
 28.5 1.122 1 3/16
116
 28.75 1.132 1 3/16
117
 29 1.142 1 7/32
118
 29.25 1.152 1 7/32
119
 29.5 1.161 1 1/4
120
 29.75 1.171 1 1/4
121
 30 1.1811 1 3/16
122
 30.25 1.19094 1 3/16
123
 30.5 1.20079 1 1/4
124
 30.75 1.21063 1 1/4
125
 31 1.22047 1 1/4
126
 31.25 1.23031 1 1/4
127
 31.5 1.24016 1 1/4
128
 31.75 1.25 1 1/4
129
 32 1.25984 1 1/4
130
 32.25 1.26969 1 9/32
131
 32.5 1.27953 1 5/16
132
 32.75 1.28937 1 5/16
133
 33 1.29921 1 5/16
134
 33.25 1.30906 1 17/64
135
 33.5 1.3189 1 9/32
136
 33.75 1.32874 1 9/32
137
 34 1.33858 1 9/32
138
 34.25 1.34843 1 21/64
139
 34.5 1.35827 1 11/32
140
 34.75 1.36811 1 11/32
141
 35 1.37795 1 3/8
142
 35.25 1.3878 1 3/8
143
 35.5 1.39764 1 3/8
144
 35.75 1.40748 1 23/64
145
 36 1.41732 1 7/16
146
 36.25 1.42717 1 7/16
147
 36.5 1.43701 1 7/16
148
 36.75 1.44685 1 25/64
149
 37 1.45669 1 15/32
150
 37.25 1.46654 1 15/32
151
 37.5 1.47638 1 1/2
152
 37.75 1.48622 1 1/2
153
 38 1.49606 1 1/2
154
 38.25 1.50591 1 31/64
155
 38.5 1.51575 1 1/2
156
 38.75 1.52559 1 1/2
157
 39 1.53543 1 17/32
158
 39.25 1.54528 1 17/32
159
 39.5 1.55512 1 33/64
160
 39.75 1.56496 1 9/16
161
 40 1.5748 1 9/16
162
 40.25 1.58465 1 9/16
163
 40.5 1.59449 1 35/64
164
 40.75 1.60433 1 19/32
165
 41 1.61417 1 5/8
166
 41.25 1.62402 1 5/8
167
 41.5 1.63386 1 5/8
168
 41.75 1.6437 1 37/64
169
 42 1.65354 1 21/32
170
 42.25 1.66339 1 21/32
171
 42.5 1.67323 1 11/16
172
 42.75 1.68307 1 11/16
173
 43 1.69291 1 11/16
174
 43.25 1.70276 1 41/64
175
 43.5 1.7126 1 23/32
176
 43.75 1.72244 1 23/32
177
 44 1.73228 1 3/4
178
 44.25 1.74213 1 3/4
179
 44.5 1.75197 1 3/4
180
 44.75 1.76181 1 43/64
181
 45 1.77165 1 7/8
182
 45.25 1.7815 1 7/8
183
 45.5 1.79134 1 7/8
184
 45.75 1.80118 1 45/64
185
 46 1.81102 1 25/32
186
 46.25 1.82087 1 25/32
187
 46.5 1.83071 1 13/16
188
 46.75 1.8406 1 13/16
189
 47 1.8504 1 7/8
190
 47.25 1.8602 1 7/8
191
 47.5 1.8701 1 7/8
192
 47.75 1.8799 1 15/16
193
 48 1.8898 1 15/16
194
 48.25 1.8996 1 15/16
195
 48.5 1.9094 1 15/16
196
 48.75 1.9193 1 15/16
197
 49 1.9291 1 15/16
198
 49.25 1.9389 1 15/16
199
 49.5 1.9488 1 15/16
200
 49.75 1.9587 1 15/16
201
 50 1.9685 1 15/16
 
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Terrance Luckett

From my very first flight from Germany to the United States as a young kid, I’ve had a love of aviations. Even today, my mind is always thinking about airplanes. Join me as I document and explore aviation, from model to full scale. 

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