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- Size Info
Inches to Millimeters Inches Millimeters 1/16 in. 1.5mm 1/8 in. 3mm 1/4 in 6mm 3/8 in 9mm 1/2 in 12mm 5/8 in 15mm 3/4 in 18.5mm 7/8 in 22mm 1 in 25mm Inches & Millimeters Comparison 
Please note that this is a close approximation. Screen resolution and monitor size will affect how you view the chart. How Many Beads Per Inch Bead Size Per Inch 7" 16" 24" 32" 36" 3mm 8.25 57 132 200 265 288 4mm 6.25 43 100 150 200 225 5mm 5.00 35 82 124 160 180 6mm 4.25 28 67 100 132 153 7mm 3.50 24 57 85 114 126 8mm 3.25 22 50 75 100 112 10mm 2.50 18 40 60 80 90 12mm 2.00 15 33 50 66 72 14mm 1.75 13 29 43 56 63 16mm 1.50 11 25 38 50 54 18mm 1.25 10 23 34 45 50 20mm 1.20 8 20 29 38 43 Please note that it allows for the length of your clasp. If you use spacer beads or mix sizes, this chart may not be accurate. Wire Gauge to Inches and Millimeters Conversion Chart Gauge Inches Millimeters 10 0.102 2.59 11 0.091 2.31 12 0.081 2.06 13 0.072 1.83 14 0.064 1.63 15 0.057 1.45 16 0.052 1.32 17 0.045 1.14 18 0.04 1.02 19 0.036 0.91 20 0.032 0.81 21 0.028 0.71 22 0.025 0.64 23 0.023 0.58 24 0.02 0.51 25 0.0179 0.455 26 0.0159 0.404 27 0.0142 0.361 28 0.0126 0.32 29 0.0113 0.287 30 0.01 0.25 31 0.0089 0.226 32 0.008 0.2 33 0.0071 0.18 34 0.0063 0.16 35 0.0056 0.142 36 0.005 0.13 37 0.0045 0.114 38 0.004 0.1