Calculate bead counts, strand lengths, pattern repeats, and material costs for jewelry and craft projects. Plan bead layouts with size and spacing tools.
The Bead Calculator helps jewelry makers and craft enthusiasts determine exactly how many beads they need for any project. Whether you're making bracelets, necklaces, earrings, or decorative items, this tool calculates bead counts, strand lengths, pattern repeats, and material costs.
Beading projects require precise planning. Too few beads and your piece is too short; too many and you waste expensive materials. Different bead sizes, spacers, and clasp allowances all affect the final count. This calculator handles all the math — enter your desired finished length, bead diameter, and spacing to get an exact count with material cost estimates.
The tool supports common bead sizes from tiny seed beads (2mm) to large focal beads (20mm+), accounts for knots between beads, and calculates how many strands you need to purchase. Use the pattern repeat feature to plan complex multi-bead designs. That keeps repeat counts and final strand length aligned before you start stringing.
Use this calculator when you need to estimate bead counts before buying materials, price out a custom piece, or check whether a strand will finish at the length you want. It is also helpful for repeating patterns where the total count needs to land on a clean multiple. That makes pattern planning less trial-and-error and more predictable.
Stringing Length = Finished Length - Clasp Length. Beads Needed = Stringing Length / (Bead Diameter + Spacing). Pattern Repeats = Total Beads / Beads Per Pattern. Strand Count = Total Beads / Beads Per Strand. Total Cost = Beads Needed × Cost Per Bead.
Result: 74 beads needed
Stringing length = 18" × 25.4 - 15mm clasp = 442.2mm. Beads = 442.2 / 6 = 73.7, so you would typically round up to 74 beads to complete the strand.
Beads are measured in millimeters (diameter). Common sizes and their typical uses: 2-3mm (seed beads, spacers, woven designs), 4mm (delicate necklaces, multi-strand designs), 6mm (standard bead stringing), 8mm (bold necklaces, bracelets), 10-12mm (statement pieces, focal beads), 14mm+ (large focal or accent beads).
Seed beads use the "aught" system: 15/0 (1.3mm), 11/0 (1.8mm), 8/0 (3mm), 6/0 (3.7mm). The larger the aught number, the smaller the bead — a historical sizing convention.
Thread (Nymo, FireLine): Best for seed bead weaving and light bead stringing. Sizes range from OO (thinnest) to D (thickest). FireLine is braided and stronger than nylon for its diameter.
Beading wire (Soft Flex, Beadalon): Multi-strand steel cable coated in nylon. Available in 7, 19, 21, and 49 strand counts — more strands means more flexible. Standard .018" or .019" works for most projects.
Elastic cord: Used for stretch bracelets. Available in 0.5mm to 1mm diameters. Thicker is more durable but may not fit smaller bead holes.
Gemstone beads vary dramatically in price. Common stones (agate, jasper) run $3-8 per strand. Semi-precious (amethyst, citrine) cost $8-20. Fine stones (tourmaline, sapphire) can be $50-500+ per strand. Glass and crystal beads offer beautiful options at lower cost points. Calculate per-bead cost by dividing strand price by the bead count per strand.
Depends on bead size. 4mm beads: ~42 beads. 6mm: ~28 beads. 8mm: ~21 beads. 10mm: ~17 beads. Subtract 10-15mm for the clasp. Stretch bracelets need fewer since there's no clasp.
Choker: 14-16". Princess: 17-19". Matinee: 20-24". Opera: 28-36". Rope: 40"+. The most common length is 18" (princess), which falls just below the collarbone.
Pearl knotting adds about 1-2mm per knot. For a strand with knots between every bead, add the knot size to each bead's effective diameter. 6mm beads with 1.5mm knots: effective size = 7.5mm per bead unit.
Standard temporary strands are usually 15-16 inches (38-40cm). The bead count per strand depends on size: 2mm ≈ 190 beads, 4mm ≈ 95, 6mm ≈ 63, 8mm ≈ 48, 10mm ≈ 38, 12mm ≈ 32.
Add 4-6 inches beyond the finished length for finishing (crimps, knots, bead tips). For knotted designs, add 25-30% extra cord since knots consume length. For multi-strand designs, add even more.
Seed beads are measured in "aught" sizes (11/0, 8/0, etc.). 11/0 seed beads are ≈1.8mm wide and fit about 14 per inch. 8/0 beads are ≈3mm and fit about 8 per inch. Multiply beads-per-inch by your length.