WarWheels.Net- Weapon Caliber Conversion Chart

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Weapon Measurement Conversion Chart

Compiled by David R. Haugh - Content Editor

Examples:

A 6.35mm Italian carbine of WWII would equal a .25 caliber weapon.
An American 8 inch caliber howitzer would equal 203.19mm.

Metric Measurement	English/US Inch Measurement
5.40 mm	.213
5.50 mm	.217
5.56 mm	.225
6.00 mm	.236
6.35 mm	.250
6.55 mm	.258
7.00 mm	.276
7.62 mm	.300
7.65 mm	.301
7.70 mm	.303
7.92 mm	.312
8.00 mm	.315
8.40 mm	.331
9.00 mm	.354
9.50 mm	.374
Metric Measurement	English/US Inch Measurement
10.00 mm	.394
10.50 mm	.412
10.60 mm	.417
11.00 mm	.433
12.00 mm	.472
12.50 mm	.492
12.70 mm	.500
13.00 mm	.512
13.40 mm	.528
14.40 mm	.567
14.80 mm	.583
15.25 mm	.600
15.40 mm	.606
16.40 mm	.646
17.40 mm	.685
Metric Measurement	English/US Inch Measurement
18.40 mm	.724
20.00 mm	.803
21.40 mm	.843
23.40 mm	.921
25.00 mm	.984
37.00 mm	1.457
47.00 mm	1.850
57.00 mm	2.244
60.00 mm	2.362
65.00 mm	2.559
75.00 mm	2.953
76.00 mm	2.992
76.19 mm	3.000
77.00 mm	3.031
81.00 mm	3.189
Metric Measurement	English/US Inch Measurement
83.81 mm	3.300
88.00 mm	3.465
90.00 mm	3.543
93.97 mm	3.700
100.00 mm	3.937
105.00 mm	4.134
106.67 mm	4.200
114.29 mm	4.500
120.00 mm	4.724
126.99 mm	5.000
150.00 mm	5.906
152.39 mm	6.000
155.00 mm	6.102
180.00 mm	7.087
203.19 mm	8.000
Metric Measurement	English/US Inch Measurement
210.00 mm	8.268
220.00 mm	8.661
233.67 mm	9.200
240.00 mm	9.449
320.00 mm	12.598
420.00 mm	16.535