Onderstaand is een omrekentabel van fracties van inches (2.54 cm) naar millimeters. Dit kan bijvoorbeeld gebruikt worden voor het omrekenen van inch-maat gereedschap naar een (bijna) passende metrische maat.
| Fractie | Decimaal | mm | Fractie | Decimaal | mm | Fractie | Decimaal | mm |
| ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | -----: |
|1/64 |0.0156 |0.3969 |1 1/64 |1.0156 |25.7969 |2 1/64 |2.0156 |51.1969 |
| 1/32 | 0.0313 | 0.7938 | 1 1/32 | 1.0313 | 26.1938 | 2 1/32 | 2.0313 | 51.5938 |
| 3/64 | 0.0469 | 1.1906 | 1 3/64 | 1.0469 | 26.5906 | 2 3/64 | 2.0469 | 51.9906 |
| 1/16 | 0.0625 | 1.5875 | 1 1/16 | 1.0625 | 26.9875 | 2 1/16 | 2.0625 | 52.3875 |
| 5/64 | 0.0781 | 1.9844 | 1 5/64 | 1.0781 | 27.3844 | 2 5/64 | 2.0781 | 52.7844 |
| 3/32 | 0.0938 | 2.3813 | 1 3/32 | 1.0938 | 27.7813 | 2 3/32 | 2.0938 | 53.1813 |
| 7/64 | 0.1094 | 2.7781 | 1 7/64 | 1.1094 | 28.1781 | 2 7/64 | 2.1094 | 53.5781 |
| 1/8 | 0.1250 | 3.1750 | 1 1/8 | 1.1250 | 28.5750 | 2 1/8 | 2.1250 | 53.9750 |
| 9/64 | 0.1406 | 3.5719 | 1 9/64 | 1.1406 | 28.9719 | 2 9/64 | 2.1406 | 54.3719 |
| 5/32 | 0.1563 | 3.9688 | 1 5/32 | 1.1563 | 29.3688 | 2 5/32 | 2.1563 | 54.7688 |
| 11/64 | 0.1719 | 4.3656 | 1 11/64 | 1.1719 | 29.7656 | 2 11/64 | 2.1719 | 55.1656 |
| 3/16 | 0.1875 | 4.7625 | 1 3/16 | 1.1875 | 30.1625 | 2 3/16 | 2.1875 | 55.5625 |
| 13/64 | 0.2031 | 5.1594 | 1 13/64 | 1.2031 | 30.5594 | 2 13/64 | 2.2031 | 55.9594 |
| 7/32 | 0.2188 | 5.5563 | 1 7/32 | 1.2188 | 30.9563 | 2 7/32 | 2.2188 | 56.3563 |
| 15/64 | 0.2344 | 5.9531 | 1 15/64 | 1.2344 | 31.3531 | 2 15/64 | 2.2344 | 56.7531 |
| 1/4 | 0.2500 | 6.3500 | 1 1/4 | 1.2500 | 31.7500 | 2 1/4 | 2.2500 | 57.1500 |
| 17/64 | 0.2656 | 6.7469 | 1 17/64 | 1.2656 | 32.1469 | 2 17/64 | 2.2656 | 57.5469 |
| 9/32 | 0.2813 | 7.1438 | 1 9/32 | 1.2813 | 32.5438 | 2 9/32 | 2.2813 | 57.9438 |
| 19/64 | 0.2969 | 7.5406 | 1 19/64 | 1.2969 | 32.9406 | 2 19/64 | 2.2969 | 58.3406 |
| 5/16 | 0.3125 | 7.9375 | 1 5/16 | 1.3125 | 33.3375 | 2 5/16 | 2.3125 | 58.7375 |
| 21/64 | 0.3281 | 8.3344 | 1 21/64 | 1.3281 | 33.7344 | 2 21/64 | 2.3281 | 59.1344 |
| 11/32 | 0.3438 | 8.7313 | 1 11/32 | 1.3438 | 34.1313 | 2 11/32 | 2.3438 | 59.5313 |
| 23/64 | 0.3594 | 9.1281 | 1 23/64 | 1.3594 | 34.5281 | 2 23/64 | 2.3594 | 59.9281 |
| 3/8 | 0.3750 | 9.5250 | 1 3/8 | 1.3750 | 34.9250 | 2 3/8 | 2.3750 | 60.3250 |
| 25/64 | 0.3906 | 9.9219 | 1 25/64 | 1.3906 | 35.3219 | 2 25/64 | 2.3906 | 60.7219 |
| 13/32 | 0.4063 | 10.3188 | 1 13/32 | 1.4063 | 35.7188 | 2 13/32 | 2.4063 | 61.1188 |
| 27/64 | 0.4219 | 10.7156 | 1 27/64 | 1.4219 | 36.1156 | 2 27/64 | 2.4219 | 61.5156 |
| 7/16 | 0.4375 | 11.1125 | 1 7/16 | 1.4375 | 36.5125 | 2 7/16 | 2.4375 | 61.9125 |
| 29/64 | 0.4531 | 11.5094 | 1 29/64 | 1.4531 | 36.9094 | 2 29/64 | 2.4531 | 62.3094 |
| 15/32 | 0.4688 | 11.9063 | 1 15/32 | 1.4688 | 37.3063 | 2 15/32 | 2.4688 | 62.7063 |
| 31/64 | 0.4844 | 12.3031 | 1 31/64 | 1.4844 | 37.7031 | 2 31/64 | 2.4844 | 63.1031 |
| 1/2 | 0.5000 | 12.7000 | 1 1/2 | 1.5000 | 38.1000 | 2 1/2 | 2.5000 | 63.5000 |
| 33/64 | 0.5156 | 13.0969 | 1 33/64 | 1.5156 | 38.4969 | 2 33/64 | 2.5156 | 63.8969 |
| 17/32 | 0.5313 | 13.4938 | 1 17/32 | 1.5313 | 38.8938 | 2 17/32 | 2.5313 | 64.2938 |
| 35/64 | 0.5469 | 13.8906 | 1 35/64 | 1.5469 | 39.2906 | 2 35/64 | 2.5469 | 64.6906 |
| 9/16 | 0.5625 | 14.2875 | 1 9/16 | 1.5625 | 39.6875 | 2 9/16 | 2.5625 | 65.0875 |
| 37/64 | 0.5781 | 14.6844 | 1 37/64 | 1.5781 | 40.0844 | 2 37/64 | 2.5781 | 65.4844 |
| 19/32 | 0.5938 | 15.0813 | 1 19/32 | 1.5938 | 40.4813 | 2 19/32 | 2.5938 | 65.8813 |
| 39/64 | 0.6094 | 15.4781 | 1 39/64 | 1.6094 | 40.8781 | 2 39/64 | 2.6094 | 66.2781 |
| 5/8 | 0.6250 | 15.8750 | 1 5/8 | 1.6250 | 41.2750 | 2 5/8 | 2.6250 | 66.6750 |
| 41/64 | 0.6406 | 16.2719 | 1 41/64 | 1.6406 | 41.6719 | 2 41/64 | 2.6406 | 67.0719 |
| 21/32 | 0.6563 | 16.6688 | 1 21/32 | 1.6563 | 42.0688 | 2 21/32 | 2.6563 | 67.4688 |
| 43/64 | 0.6719 | 17.0656 | 1 43/64 | 1.6719 | 42.4656 | 2 43/64 | 2.6719 | 67.8656 |
| 11/16 | 0.6875 | 17.4625 | 1 11/16 | 1.6875 | 42.8625 | 2 11/16 | 2.6875 | 68.2625 |
| 45/64 | 0.7031 | 17.8594 | 1 45/64 | 1.7031 | 43.2594 | 2 45/64 | 2.7031 | 68.6594 |
| 23/32 | 0.7188 | 18.2563 | 1 23/32 | 1.7188 | 43.6563 | 2 23/32 | 2.7188 | 69.0563 |
| 47/64 | 0.7344 | 18.6531 | 1 47/64 | 1.7344 | 44.0531 | 2 47/64 | 2.7344 | 69.4531 |
| 3/4 | 0.7500 | 19.0500 | 1 3/4 | 1.7500 | 44.4500 | 2 3/4 | 2.7500 | 69.8500 |
| 49/64 | 0.7656 | 19.4469 | 1 49/64 | 1.7656 | 44.8469 | 2 49/64 | 2.7656 | 70.2469 |
| 25/32 | 0.7813 | 19.8438 | 1 25/32 | 1.7813 | 45.2438 | 2 25/32 | 2.7813 | 70.6438 |
| 51/64 | 0.7969 | 20.2406 | 1 51/64 | 1.7969 | 45.6406 | 2 51/64 | 2.7969 | 71.0406 |
| 13/16 | 0.8125 | 20.6375 | 1 13/16 | 1.8125 | 46.0375 | 2 13/16 | 2.8125 | 71.4375 |
| 53/64 | 0.8281 | 21.0344 | 1 53/64 | 1.8281 | 46.4344 | 2 53/64 | 2.8281 | 71.8344 |
| 27/32 | 0.8438 | 21.4313 | 1 27/32 | 1.8438 | 46.8313 | 2 27/32 | 2.8438 | 72.2313 |
| 55/64 | 0.8594 | 21.8281 | 1 55/64 | 1.8594 | 47.2281 | 2 55/64 | 2.8594 | 72.6281 |
| 7/8 | 0.8750 | 22.2250 | 1 7/8 | 1.8750 | 47.6250 | 2 7/8 | 2.8750 | 73.0250 |
| 57/64 | 0.8906 | 22.6219 | 1 57/64 | 1.8906 | 48.0219 | 2 57/64 | 2.8906 | 73.4219 |
| 29/32 | 0.9063 | 23.0188 | 1 29/32 | 1.9063 | 48.4188 | 2 29/32 | 2.9063 | 73.8188 |
| 59/64 | 0.9219 | 23.4156 | 1 59/64 | 1.9219 | 48.8156 | 2 59/64 | 2.9219 | 74.2156 |
| 15/16 | 0.9375 | 23.8125 | 1 15/16 | 1.9375 | 49.2125 | 2 15/16 | 2.9375 | 74.6125 |
| 61/64 | 0.9531 | 24.2094 | 1 61/64 | 1.9531 | 49.6094 | 2 61/64 | 2.9531 | 75.0094 |
| 31/32 | 0.9688 | 24.6063 | 1 31/32 | 1.9688 | 50.0063 | 2 31/32 | 2.9688 | 75.4063 |
| 63/64 | 0.9844 | 25.0031 | 1 63/64 | 1.9844 | 50.4031 | 2 63/64 | 2.9844 | 75.8031 |
| 1 | 1.0000 | 25.4000 | 2 | 2.0000 | 50.8000 | 3 | 3.0000 | 76.2000 |
Bron: http://www.plumbingstore.com/metric_system.html