We’re all taught inches in school in the US – sometimes the metric system, but generally not how to convert them. That, or we’ve forgotten how. With the coversion millimeters to inches and vice versa being integral in manufacturing, industrial equipment manufacturing, and many other facets of daily life, we’ve created a resource for this. To give a very quick reference, 1 inch = 25.4 milimeters, and 1 milimeter – 0.03937 inches.
inches to Millimeters Calculator
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Millmeters to Inches Calculator
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Conversion Table: Fractional Inches to Decimal Inches to Millimeters
This handy conversion table makes it easy to convert fractional inches to decimal inches and then to millimeters—all in one place. It’s a quick reference tool for engineers and machinists working across both imperial and metric systems.
| Fractional Inches | Decimal Inches | Millimeters |
|---|---|---|
| 1/64" | 0.0156" | 0.40 mm |
| 1/32" | 0.0313" | 0.79 mm |
| 1/16" | 0.0625" | 1.59 mm |
| 3/32" | 0.0938" | 2.38 mm |
| 1/8" | 0.1250" | 3.18 mm |
| 5/32" | 0.1563" | 3.97 mm |
| 3/16" | 0.1875" | 4.76 mm |
| 7/32" | 0.2188" | 5.56 mm |
| 1/4" | 0.2500" | 6.35 mm |
| 9/32" | 0.2813" | 7.14 mm |
| 5/16" | 0.3125" | 7.94 mm |
| 11/32" | 0.3438" | 8.73 mm |
| 3/8" | 0.3750" | 9.53 mm |
| 13/32" | 0.4063" | 10.32 mm |
| 7/16" | 0.4375" | 11.11 mm |
| 15/32" | 0.4688" | 11.91 mm |
| 1/2" | 0.5000" | 12.70 mm |
| 17/32" | 0.5313" | 13.49 mm |
| 9/16" | 0.5625" | 14.29 mm |
| 19/32" | 0.5938" | 15.08 mm |
| 5/8" | 0.6250" | 15.88 mm |
| 21/32" | 0.6563" | 16.67 mm |
| 11/16" | 0.6875" | 17.46 mm |
| 23/32" | 0.7188" | 18.26 mm |
| 3/4" | 0.7500" | 19.05 mm |
| 25/32" | 0.7813" | 19.84 mm |
| 13/16" | 0.8125" | 20.64 mm |
| 27/32" | 0.8438" | 21.43 mm |
| 7/8" | 0.8750" | 22.23 mm |
| 29/32" | 0.9063" | 23.02 mm |
| 15/16" | 0.9375" | 23.81 mm |
| 31/32" | 0.9688" | 24.61 mm |
| 1" | 1.0000" | 25.40 mm |
| 1 1/4" | 1.2500" | 31.75 mm |
| 1 1/2" | 1.5000" | 38.10 mm |
| 1 3/4" | 1.7500" | 44.45 mm |
| 2" | 2.0000" | 50.80 mm |
| 2 1/4" | 2.2500" | 57.15 mm |
| 2 1/2" | 2.5000" | 63.50 mm |
| 2 3/4" | 2.7500" | 69.85 mm |
| 3" | 3.0000" | 76.20 mm |
| 3 1/4" | 3.2500" | 82.55 mm |
| 3 1/2" | 3.5000" | 88.90 mm |
| 3 3/4" | 3.7500" | 95.25 mm |
| 4" | 4.0000" | 101.60 mm |
| 4 1/4" | 4.2500" | 107.95 mm |
| 4 1/2" | 4.5000" | 114.30 mm |
| 4 3/4" | 4.7500" | 120.65 mm |
| 5" | 5.0000" | 127.00 mm |
| 5 1/4" | 5.2500" | 133.35 mm |
| 5 1/2" | 5.5000" | 139.70 mm |
| 5 3/4" | 5.7500" | 146.05 mm |
| 6" | 6.0000" | 152.40 mm |
| 6 1/4" | 6.2500" | 158.75 mm |
| 6 1/2" | 6.5000" | 165.10 mm |
| 6 3/4" | 6.7500" | 171.45 mm |
| 7" | 7.0000" | 177.80 mm |
| 7 1/4" | 7.2500" | 184.15 mm |
| 7 1/2" | 7.5000" | 190.50 mm |
| 7 3/4" | 7.7500" | 196.85 mm |
| 8" | 8.0000" | 203.20 mm |
| 8 1/4" | 8.2500" | 209.55 mm |
| 8 1/2" | 8.5000" | 215.90 mm |
| 8 3/4" | 8.7500" | 222.25 mm |
| 9" | 9.0000" | 228.60 mm |
| 9 1/4" | 9.2500" | 234.95 mm |
| 9 1/2" | 9.5000" | 241.30 mm |
| 9 3/4" | 9.7500" | 247.65 mm |
| 10" | 10.0000" | 254.00 mm |
Inches to mm Visual Conversion
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Author: Scott Bredemann | Updated: 7/24/2025
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The content on this webpage is for informational purposes only. MISUMI makes no guarantees, expressed or implied, regarding the accuracy, completeness, or validity of the information. Performance parameters, tolerances, designs, materials, or processes should not be assumed to reflect third-party suppliers’ or manufacturers’ deliverables within MISUMI’s network. Buyers are responsible for specifying their part requirements