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Our decimal conversion chart provides a fast and reliable reference for converting measurements. Whether you want to convert inches to mm to find the right drill size or drill size to tap size, you can trust these charts for accurate measurements.
We’ve compiled charts with decimal equivalents for:
Reference our decimal conversion charts below.
| Drill Size | Millimeters | Inches (Decimal) |
|---|---|---|
| — | 0.10 | 0.0039 |
| — | 0.20 | 0.0079 |
| — | 0.25 | 0.0098 |
| — | 0.30 | 0.0118 |
| 80 | 0.34 | 0.0135 |
| 79 | 0.37 | 0.0145 |
| 1/64 | 0.40 | 0.0156 |
| 78 | 0.41 | 0.0160 |
| 77 | 0.46 | 0.0180 |
| — | 0.50 | 0.0197 |
| 76 | 0.51 | 0.0200 |
| 75 | 0.53 | 0.0210 |
| 74 | 0.57 | 0.0225 |
| — | 0.60 | 0.0236 |
| 73 | 0.61 | 0.0240 |
| 72 | 0.64 | 0.0250 |
| 71 | 0.66 | 0.0260 |
| — | 0.70 | 0.0267 |
| 70 | 0.71 | 0.0280 |
| 69 | 0.74 | 0.0292 |
| — | 0.75 | 0.0295 |
| 68 | 0.79 | 0.0310 |
| 1/32 | 0.79 | 0.0313 |
| — | 0.80 | 0.0315 |
| 67 | 0.81 | 0.0320 |
| 66 | 0.84 | 0.0330 |
| 65 | 0.89 | 0.0350 |
| — | 0.90 | 0.0354 |
| 64 | 0.91 | 0.0360 |
| 63 | 0.94 | 0.0370 |
| 62 | 0.97 | 0.0380 |
| 61 | 0.99 | 0.0390 |
| — | 1.00 | 0.0394 |
| 60 | 1.02 | 0.0400 |
| 59 | 1.04 | 0.0410 |
| 58 | 1.07 | 0.0420 |
| 57 | 1.09 | 0.0430 |
| 56 | 1.18 | 0.0465 |
| 3/64 | 1.19 | 0.0469 |
| 55 | 1.32 | 0.0520 |
| 54 | 1.40 | 0.0550 |
| 53 | 1.51 | 0.0595 |
| 1/16 | 1.59 | 0.0625 |
| 52 | 1.61 | 0.0635 |
| 51 | 1.70 | 0.0670 |
| 50 | 1.78 | 0.0700 |
| 49 | 1.85 | 0.0730 |
| 48 | 1.93 | 0.0760 |
| 5/64 | 1.98 | 0.0781 |
| 47 | 1.99 | 0.0785 |
| — | 2.00 | 0.0787 |
| 46 | 2.06 | 0.0810 |
| 45 | 2.08 | 0.0820 |
| 44 | 2.18 | 0.0860 |
| 43 | 2.26 | 0.0890 |
| 42 | 2.37 | 0.0935 |
| 3/32 | 2.38 | 0.0938 |
| 41 | 2.44 | 0.0960 |
| 40 | 2.50 | 0.0980 |
| 39 | 2.53 | 0.0995 |
| 38 | 2.58 | 0.1015 |
| 37 | 2.64 | 0.1040 |
| 36 | 2.71 | 0.1065 |
| 7/64 | 2.78 | 0.1095 |
| 35 | 2.79 | 0.1100 |
| 34 | 2.82 | 0.1110 |
| 33 | 2.87 | 0.1130 |
| 32 | 2.95 | 0.1160 |
| — | 3.00 | 0.1181 |
| 31 | 3.05 | 0.1200 |
| 1/8 | 3.18 | 0.1250 |
| 30 | 3.26 | 0.1285 |
| 29 | 3.45 | 0.1360 |
| 28 | 3.57 | 0.1405 |
| 9/64 | 3.57 | 0.1406 |
| 27 | 3.66 | 0.1440 |
| 26 | 3.73 | 0.1470 |
| 25 | 3.80 | 0.1495 |
| 24 | 3.86 | 0.1520 |
| 23 | 3.91 | 0.1540 |
| 5/32 | 3.97 | 0.1562 |
| 22 | 3.99 | 0.1570 |
| — | 4.00 | 0.1575 |
| 21 | 4.04 | 0.1590 |
| 20 | 4.09 | 0.1610 |
| 19 | 4.22 | 0.1660 |
| 18 | 4.31 | 0.1695 |
| 11/64 | 4.37 | 0.1719 |
| 17 | 4.39 | 0.1730 |
| 16 | 4.50 | 0.1770 |
| 15 | 4.57 | 0.1800 |
| 14 | 4.62 | 0.1820 |
| 13 | 4.70 | 0.1850 |
| 3/16 | 4.76 | 0.1875 |
| 12 | 4.80 | 0.1890 |
| 11 | 4.85 | 0.1910 |
| 10 | 4.91 | 0.1935 |
| 9 | 4.98 | 0.1960 |
| — | 5.00 | 0.1968 |
| 8 | 5.05 | 0.1990 |
| 7 | 5.11 | 0.2010 |
| 13/64 | 5.16 | 0.2031 |
| 6 | 5.18 | 0.2040 |
| 5 | 5.22 | 0.2055 |
| 4 | 5.31 | 0.2090 |
| 3 | 5.41 | 0.2130 |
| 7/32 | 5.56 | 0.2188 |
| 2 | 5.61 | 0.2210 |
| 1 | 5.79 | 0.2280 |
| A | 5.94 | 0.2340 |
| 15/64 | 5.95 | 0.2344 |
| — | 6.00 | 0.2362 |
| B | 6.015 | 0.2380 |
| C | 6.15 | 0.2420 |
| D | 6.25 | 0.2460 |
| 1/4 | 6.35 | 0.2500 |
| E | 6.35 | 0.2500 |
| F | 6.53 | 0.2570 |
| G | 6.63 | 0.2610 |
| 17/64 | 6.75 | 0.2656 |
| H | 6.76 | 0.2660 |
| I | 6.91 | 0.2720 |
| — | 7.00 | 0.2756 |
| J | 7.04 | 0.2770 |
| K | 7.14 | 0.2810 |
| 9/32 | 7.14 | 0.2812 |
| L | 7.37 | 0.2900 |
| M | 7.49 | 0.2950 |
| 19/64 | 7.54 | 0.2969 |
| N | 7.67 | 0.3020 |
| 5/16 | 7.94 | 0.3125 |
| — | 8.00 | 0.3150 |
| O | 8.03 | 0.3160 |
| P | 8.20 | 0.3230 |
| 21/64 | 8.33 | 0.3281 |
| Q | 8.43 | 0.3320 |
| R | 8.61 | 0.3390 |
| 11/32 | 8.73 | 0.3438 |
| S | 8.84 | 0.3480 |
| — | 9.00 | 0.3543 |
| T | 9.09 | 0.3580 |
| 23/64 | 9.13 | 0.3594 |
| U | 9.35 | 0.3680 |
| 3/8 | 9.53 | 0.3750 |
| V | 9.56 | 0.3770 |
| W | 9.80 | 0.3860 |
| 25/64 | 9.92 | 0.3906 |
| — | 10.00 | 0.3937 |
| X | 10.08 | 0.3970 |
| Y | 10.26 | 0.4040 |
| 13/32 | 10.32 | 0.4062 |
| Z | 10.49 | 0.4130 |
| 27/64 | 10.72 | 0.4219 |
| — | 11.00 | 0.4331 |
| 7/16 | 11.11 | 0.4375 |
| 29/64 | 11.51 | 0.4531 |
| 15/32 | 11.91 | 0.4688 |
| — | 12.00 | 0.4724 |
| 31/64 | 12.30 | 0.4844 |
| 1/2 | 12.70 | 0.5000 |
| — | 13.00 | 0.5118 |
| 33/64 | 13.10 | 0.5156 |
| 17/32 | 13.49 | 0.5312 |
| 35/64 | 13.89 | 0.5469 |
| — | 14.00 | 0.5512 |
| 9/16 | 14.29 | 0.5625 |
| 37/64 | 14.68 | 0.5781 |
| — | 15.00 | 0.5906 |
| 19/32 | 15.08 | 0.5938 |
| 39/64 | 15.48 | 0.6094 |
| 5/8 | 15.88 | 0.6250 |
| — | 16.00 | 0.6299 |
| 41/64 | 16.27 | 0.6406 |
| 21/32 | 16.67 | 0.6562 |
| — | 17.00 | 0.6693 |
| 43/64 | 17.07 | 0.6719 |
| 11/16 | 17.46 | 0.6875 |
| 45/64 | 17.86 | 0.7031 |
| — | 18.00 | 0.7087 |
| 23/32 | 18.26 | 0.7188 |
| 47/64 | 18.65 | 0.7344 |
| — | 19.00 | 0.7480 |
| 3/4 | 19.05 | 0.7500 |
| 49/64 | 19.45 | 0.7656 |
| 25/32 | 19.84 | 0.7812 |
| — | 20.00 | 0.7874 |
| 51/64 | 20.24 | 0.7969 |
| 13/16 | 20.64 | 0.8125 |
| — | 21.00 | 0.8268 |
| 53/64 | 21.03 | 0.8281 |
| 27/32 | 21.43 | 0.8438 |
| 55/64 | 21.84 | 0.8594 |
| — | 22.00 | 0.8661 |
| 7/8 | 22.23 | 0.8750 |
| 57/64 | 22.62 | 0.8906 |
| — | 23.00 | 0.9055 |
| 29/32 | 23.02 | 0.9062 |
| 59/64 | 23.42 | 0.9219 |
| 15/16 | 23.81 | 0.9375 |
| — | 24.00 | 0.9449 |
| 61/64 | 24.21 | 0.9531 |
| 31/32 | 24.61 | 0.9688 |
| — | 25.00 | 0.9842 |
| 63/34 | 25.00 | 0.9844 |
| 1″ | 25.40 | 1.00000 |
| Tap Size | Drill Size | Probable % Thread |
|---|---|---|
| 0-80 | 3/64 | 71-81 |
| M1.6 x 0.35 | 1.25 mm | 69-77 |
| 1-64 | 53 | 59-67 |
| M2 x 0.40 | 1/16 | 72-79 |
| 1-72 | 53 | 67-75 |
| 2-56 | 50 | 52-69 |
| 2-64 | 50 | 70-79 |
| M2.5 x 0.45 | 2.05 mm | 69-77 |
| 3-48 | 5/64 | 70-77 |
| 3-56 | 46 | 69-78 |
| 4-40 | 43 | 65-71 |
| 4-48 | 42 | 61-68 |
| M3 x 0.50 | 40 | 70-79 |
| 5-40 | 38 | 65-72 |
| 5-44 | 37 | 63-71 |
| M3.5 x 0.60 | 2.9 mm | 72-81 |
| 6-32 | 36 | 71-78 |
| 6-40 | 33 | 69-77 |
| M4 x 0.70 | 3.30 mm | 74-82 |
| 8-32 | 29 | 62-69 |
| 8-36 | 29 | 70-78 |
| 10-24 | 25 | 69-75 |
| 10-32 | 21 | 78-76 |
| M5 x 0.80 | 4.20 mm | 69-77 |
| 12-24 | 16 | 66-72 |
| 12-28 | 4.00 mm | 70-78 |
| M6 x 1 | 5.00 mm | 76-84 |
| 1/4-20 | 7 | 70-75 |
| 1/4-28 | 3 | 72-80 |
| 5/16-18 | F | 72-77 |
| 5/16-24 | I | 67-75 |
| M8 x 1.25 | 6.70 mm | 74-80 |
| 3/8-16 | 5/16 | 72-77 |
| 3/8-24 | Q | 71-79 |
| M10 x 1.50 | 8.5 mm | 76-82 |
| 7/16-14 | U | 70-75 |
| 7/16-20 | 25/64 | 65-72 |
| M12 x 1.75 | 13/32 | 69-74 |
| 1/2-13 | 27/64 | 73-78 |
| 1/2-20 | 29/64 | 65-72 |
| M14 x 2 | 15/32 | 76-81 |
| 9/16-12 | 31/64 | 68-72 |
| 9/16-18 | 33/64 | 58-65 |
| 5/8-11 | 17/32 | 75-79 |
| 5/8-18 | 37/64 | 58-65 |
| M16 x 2 | 35/64 | 76-81 |
| 3/4-10 | 21/32 | 68-72 |
| 3/4-16 | 11/16 | 71-77 |
| M20 x 2.5 | 11/16 | 74-78 |
| 7/8-9 | 49/64 | 72-76 |
| 7/8-14 | 13/16 | 62-67 |
| M24 x 3 | 53/64 | 72-76 |
| 1-8 | 7/8 | 73-77 |
| 1-12 | 59/64 | 67-72 |
| 1-14 | 15/16 | 61-67 |
| 1-1/8-7 | 63/64 | 72-76 |
| 1-1/8-12 | 1-3/64 | 66-72 |
| M30 x 3.5 | 26.5 mm | 75 |
| 1-1/4-7 | 1-7/64 * | 76 |
| 1-1/4-12 | 1-11/64 * | 72 |
| 1-3/8-6 | 1-7/32 * | 72 |
| 1-3/8-12 | 1-19/64 * | 72 |
| M36 x 4 | 32 mm | 82 |
| 1-1/2-6 | 1-11/32 * | 72 |
| 1-1/2-12 | 1-27/64 * | 72 |
| * Reaming Recommended |
| Tap Size | Taper Pipe NPT | Straight Pipe NPS |
|---|---|---|
| 1/16-27 | 0 | 1/4 |
| 1/8-27 | 11/32 | 11/32 |
| 1/4-18 | 7/16 | 7/16 |
| 3/8-18 | 37/64 | 37/64 |
| 1/2-14 | 23/32 | 23/32 |
| 3/4-14 | 59/64 | 59/64 |
| 1-11-1/2 | 1-5/32 | 1-5/32 |
| 1-1/4-11-1/2 | 1-1/2 | 1-1/2 |
| 1-1/2-11-1/2 | 1-3/4 | 1-3/4 |
| 2-11-1/2 | 2-7/32 | 2-7/32 |
| 2-1/2-8 | 2-21/32 | 2-21/32 |
Accuracy is essential in professional trades, so measurements must be precise. Small errors in converting mm to inches or other calculations can lead to critical errors that increase costs or delay the timeline. We simplify the measurement conversion process with our decimal conversion chart.
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