Work out bead quantity for jewellery instantly with clear inputs, formula shown and shareable results.
Each bead plus its spacer occupies one pitch length, so the bead count is the strand length in millimetres divided by that pitch, and weight assumes spherical glass at 2.5 g per cubic centimetre. Spacers eat into the bead count quickly: adding a 2 mm spacer to 6 mm beads cuts the number of feature beads by a quarter.
Bead count
beads = floor(length mm / (bead diameter + spacer size))
Weight estimate
grams = beads x sphere volume x glass density of 2.5 g/cm3
beads = floor(length mm / (bead diameter + spacer size)). Each bead plus its spacer occupies one pitch length, so the bead count is the strand length in millimetres divided by that pitch, and weight assumes spherical glass at 2.5 g per cubic centimetre.
Spacers eat into the bead count quickly: adding a 2 mm spacer to 6 mm beads cuts the number of feature beads by a quarter.
Enter finished length, bead diameter, spacer size between beads. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.