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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