A: First you need to know what length your bracelet is going to be. Start by measuring the "target" wrist. Then add 1 1/4 to 1 1/2 inches to account for a clasp and to give it some play. For a typical wrist, you'll probably wind up at about 7 1/2 inches, give or take.
Now for your question about bead size. In most cases you're going to want to lay out your design on a bead board and make adjustments until you get the right length, as you may be using a variety of bead sizes and even including charms, connectors and other components, so there is no simple answer. It's basically an iterative design process.
If you are buying beads that are measured in millimeters like this one, you may want to use a converter or chart. For example, there are about 25.5 mm to and inch. so it would take 6 or 7 4mm beads to cover a linear inch.
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Answer provided by: Ron (8/31/2013)