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Here is a handy chart that will help you determine the approximate number of beads needed.

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

Remember to allow for the length of your clasp. If you use spacer beads or mix sizes this chart may not be accurate.

If the size bead you are working with is not on our chart here is the formula for calculating:
1" equals 25.4mm
Measure the bead you are working with. Take the length of your project and multiply the number of inches by 25.4mm, take that number and divide by the size of the bead.