| | | | | . | French Conversion Chart | | | | . | Diameter | Diameter | French | Diameter | . | (mm) | (inch) | (Fr) | (in) | . | 1.00 | 0.039 | 3 | | . | 1.35 | 0.053 | 4 | | . | 1.59 | 0.063 | | 1/16 | . | 1.67 | 0.066 | 5 | | . | 2.00 | 0.079 | 6 | | . | 2.30 | 0.091 | 7 | | . | 2.38 | 0.094 | | 3/32 | . | 2.70 | 0.106 | 8 | | . | 3.00 | 0.118 | 9 | | . | 3.18 | 0.125 | | 1/8 | . | 3.30 | 0.130 | 10 | | . | 3.70 | 0.146 | 11 | | . | 3.97 | 0.156 | | 5/32 | . | 4.00 | 0.157 | 12 | | . | 4.07 | 0.160 | | | . | 4.30 | 0.169 | 13 | | . | 4.70 | 0.185 | 14 | |
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| | | | | . | 4.76 | 0.187 | | 3/16 | . | 5.00 | 0.197 | 15 | | . | 5.30 | 0.209 | 16 | | . | 5.50 | 0.217 | | | . | 5.55 | 0.219 | | 7/32 | . | 5.70 | 0.224 | 17 | | . | 6.00 | 0.236 | 18 | | . | 6.30 | 0.248 | 19 | | . | 6.35 | 0.250 | | 1/4 | . | 6.70 | 0.264 | 20 | | . | 7.40 | 0.291 | | 9/32 | . | 7.30 | 0.287 | 22 | | . | 7.94 | 0.313 | | 5/16 | . | 8.00 | 0.315 | 24 | | . | 8.70 | 0.343 | 26 | | . | 9.30 | 0.366 | 28 | | . | 9.52 | 0.375 | | 3/8 | . | 10.00 | 0.394 | 30 | | . | 11.11 | 0.437 | | 7/16 | . | 11.30 | 0.445 | 34 | |
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| | | | | . | 12.00 | 0.472 | 36 | | . | 12.70 | 0.500 | | 1/2 |
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