Tubing Size Conversion Chart
Tubing Measurement Conversion Chart
Inches to Fractions to Metric
Check your ID or OD tubing measurements in the most common sizes and convert fractions to metric.
| Decimal | Fraction | Metric |
| 0.0313 | 1/32 | 0.80 mm |
| 0.0394 | _ | 1 mm |
| 0.0625 | 1/16 | 1.59 mm |
| 0.0787 | _ | 2 mm |
| 0.0938 | 3/32 | 2.38 mm |
| 0.1181 | _ | 3 mm |
| 0.1250 | 1/8 | 3.175 mm |
| 0.1563 | 5/32 | 3.97 mm |
| 0.1575 | _ | 4 mm |
| 0.1875 | 3/16 | 4.76 mm |
| 0.1969 | _ | 5 mm |
| 0.2188 | 7/32 | 5.56 mm |
| 0.2362 | _ | 6 mm |
| 0.2500 | 1/4 | 6.35 mm |
| 0.2755 | _ | 7 mm |
| 0.2813 | 9/32 | 7.15 mm |
| 0.3125 | 5/16 | 7.94 mm |
| 0.3150 | _ | 8 mm |
| 0.3438 | 11/32 | 8.73 mm |
| 0.3543 | _ | 9 mm |
| 0.3750 | 3/8 | 9.525 mm |
| 0.3937 | _ | 10 mm |
| 0.4063 | 13/32 | 10.32 mm |
| 0.4331 | _ | 11 mm |
| 0.4375 | 7/16 | 11.11 mm |
| 0.4688 | 15/32 | 11.91 mm |
| 0.4724 | _ | 12 mm |
| 0.5000 | 1/2 | 12.7 mm |
| 0.5118 | _ | 13 mm |
| 0.5512 | _ | 14 mm |
| 0.5625 | 9/16 | 14.29 mm |
| 0.5906 | _ | 15 mm |
| 0.6250 | 5/8 | 15.875 mm |
| 0.6299 | _ | 16 mm |
| 0.6693 | _ | 17 mm |
| 0.7087 | _ | 18 mm |
| 0.7500 | 3/4 | 19.05 mm |
| 0.7874 | _ | 20 mm |
| 0.8268 | _ | 21 mm |
| 0.8661 | _ | 22 mm |
| 0.8750 | 7/8 | 22.23 mm |
| 1.0000 | 1 | 25.4 mm |