Bead Count & Spacing Calculator

Planning a beaded bracelet or necklace means turning a finished length into a bead count and a length of cord to cut. This calculator does both: it converts your target length and bead size into how many beads you need, how much stringing material to cut, and how a repeating pattern divides across the strand.

How it works

Every bead occupies a fixed pitch along the strand — its diameter plus any deliberate spacing gap:

pitch        = bead diameter + spacing gap   (mm)
bead count   = floor(finished length mm / pitch)
beads/inch   = 25.4 / pitch
thread length = finished length + waste allowance

The waste allowance covers the cord you need beyond the last bead for knots, crimps, and the clasp. For a repeating motif of N beads, full repeats are floor(count / N) and the leftover is count mod N.

Example and tips

A 18 cm (180 mm) bracelet strung with 8 mm rounds and no spacer gives 180 / 8 = 22 beads, about 3.2 beads per inch. Add a 4 mm seed spacer between each round and the pitch becomes 12 mm, dropping the count to 15 beads. Always cut a little long: it is far easier to trim excess cord than to restring a strand that came up short at the clasp. For symmetric patterns, aim for an odd leftover so you can place a single centre bead.

Thread and cord length: why the waste allowance matters

The calculated bead count tells you how many beads to buy. The thread length tells you how much stringing material to cut — and cutting too short is the most frustrating mistake in beadwork, because you cannot simply splice more cord invisibly.

The tool adds a default 15 cm (about 6 inches) waste allowance beyond the beaded length. This covers:

• About 5 cm on each end for finishing knots or crimp placement
• A tail long enough to thread through the last few beads and tuck in cleanly
• Extra slack for attaching a lobster-claw, toggle, or magnetic clasp

If you are using a multi-strand design or double-knotting between every bead (common in fine pearl necklaces), increase the waste to 20–25 cm per strand.

Choosing your bead size for a given length

Sometimes you start with a target length and a visual density you want, and need to work backward to a bead size. A quick mental rule: divide the finished length in millimetres by the number of beads you want. That gives you the ideal pitch. If you want some spacing, subtract a 2–4 mm spacer from the pitch to get the bead diameter. For example: a 20 cm (200 mm) bracelet with 25 beads needs a pitch of 8 mm — suitable for 6 mm rounds with a 2 mm spacer, or 8 mm rounds edge-to-edge.

Pattern repeats and symmetry

The pattern repeat feature is most useful for two-colour or multi-motif designs where you want the pattern to complete evenly rather than ending mid-repeat. Enter your total bead count and the number of beads in one repeat; the tool tells you how many full repeats fit and how many beads are left over.

For a bracelet with no clasp (memory wire or stretch cord), aim for zero leftover. For a clasp design, a small leftover is acceptable because the clasp itself fills the visual gap. Odd leftovers — 1 or 3 beads — work best because you can place a contrasting focal bead at the centre and still have the repeating pattern symmetrical on either side.