ExactUnits
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Beading and jewellery calculator

Bead count is length divided by bead size, with an allowance for the clasp and the knots.

Beads per piece
53
= Exact Beading quantity
Beads for all pieces
159
Spacers per piece
53
Thread per piece
60.0
Total thread
180.00
Actual finished length
44.40
Show the working
  1. Finished length = 45
  2. Bead diameter = 6
  3. Spacer size = 2
  4. Clasp and findings = 20
  5. Extra thread for knots = 15
  6. Number of pieces = 3
  7. strung_mm = 45 * 10 - 20 = 430
  8. module = 6 + 2 = 8
  9. Beads per piece = 8 > 0 ? floor(430 / 8) : 0 = 53
  10. Spacers per piece = 2 > 0 ? 53 : 0 = 53
  11. Thread per piece = 45 + 15 = 60
  12. Beads for all pieces = 53 * 3 = 159
  13. Total thread = 60 * 3 = 180
  14. Actual finished length = (53 * 8 + 20) / 10 = 44.4

Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.

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    The formula

    • beads = floor((length - clasp) / (bead size + spacer))

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