Pearl Strand Length & Bead Count Calculator
Enter a finished strand length and a pearl diameter to see how many pearls you need — with room for knots, spacer beads, and the clasp.
Pearls needed
Pearls are laid end to end, so the count is the usable length divided by one pearl plus its following gap, rounded down. Buy a few spare pearls to allow for drilling and matching.
From length to bead count
Stringing a strand of pearls is really an exercise in division. The pearls line up end to end, so once you fix the finished length and the pearl size, the number of pearls is set — the length divided by each pearl’s diameter, minus whatever a clasp takes up. Knotting between pearls, the traditional way to protect them and stop a break from scattering the lot, adds a small gap that spreads the same pearls over a little more length.
Use it to plan a re-string, price up loose pearls before you buy, or convert an inch length you like on a store necklace into the pearl count you’d order.
Frequently Asked Questions
How many pearls are in a strand?
It depends on the finished length and the pearl size. Pearls sit end to end, so the count is the strand length divided by one pearl's diameter (plus any gap left by a knot or spacer bead), rounded down to a whole pearl. A classic 18-inch (about 450mm) princess strand of 7mm pearls holds roughly 64 pearls.
What lengths do standard pearl necklaces come in?
The common bands are collar (12–13"), choker (14–16"), princess (17–19"), matinee (20–24"), opera (28–36"), and rope (37"+). Enter the finished length in millimetres — 1 inch is 25.4mm — to match the strand you're planning.
Should I account for knots between pearls?
Yes, if you're hand-knotting. Each knot or spacer bead adds a small gap between pearls, so the same length holds slightly fewer of them. Put that gap in the spacing field and the tool folds it into the per-pearl pitch.
How many spare pearls should I buy?
Buy a few more than the count suggests. Drilling can crack the odd pearl, some won't match closely enough on luster or shape, and a spare or two lets you swap for the best faces. A 5–10% cushion is sensible for a full strand.