Milimetres Inches
1.5mm 1/16 in.
3mm 1/8 in.
6mm 1/4 in
9mm 3/8 in
12mm 1/2 in
15mm 5/8 in
18.5mm 3/4 in
22mm 7/8 in
25mm 1 in 

 

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 the above is an approximation and should be double-checked prior to purchasing :-)