Bead Count Length
Calculator
Results
- Beads per cm
- 1.666666
- Beads (exact)
- 75
- Beads needed
- 75
- Strand length covered (cm)
- 45
Craft results
| Beads per cm | 1.666666 |
| Beads (exact) | 75 |
| Beads needed | 75 |
| Strand length covered (cm) | 45 |
formula-map diagram
- Beads per cm
- 1.666666
- Beads (exact)
- 75
- Beads needed
- 75
- Strand length covered (cm)
- 45
Formula breakdown
Formula
beads = length ÷ bead diameter= 1.6666666666667
Note
Simplified model: these are standard craft estimates based on rectangular layouts, quoted gauge and nominal densities. Real fabric nap, directional prints, shrinkage, pattern matching, yarn lots and supplier SAP values vary, so always make a swatch or test piece and buy a little extra.
More in Crafts and sewing
See all →Frequently asked questions
How does bead size determine how many fit in a given length?+
Bead count is length divided by individual bead diameter (plus a small allowance for the thread gap between beads), so smaller beads like size 11 seed beads need far more per inch than 8mm beads. This calculator converts your target length and bead size directly into a bead count.
Why isn't the bead count exactly length divided by diameter?+
Beads don't sit perfectly edge to edge; there's a small gap from the thread or wire passing through, and irregular beads (like natural stone) vary in size bead to bead, so real counts often run slightly lower than the pure geometric calculation.
Does bead hole size or shape affect this calculation?+
Hole size doesn't affect the length calculation, but bead shape does: rondelles and disc beads take up less length per bead than round beads of the same width, so match the shape assumption to what you're actually using.
How much extra should I buy beyond the calculated count?+
Buy 10-20% extra to account for size variation in a strand, breakage during stringing, and design changes, especially for irregularly shaped natural beads where variation is higher than for uniform glass or plastic beads.
Why do seed bead sizes use a number system instead of millimeters?+
Seed beads are sized by an 'aught' system (like size 6, 8, 11, 15) where a higher number means a smaller bead, a convention from Czech and Japanese seed bead manufacturing rather than a direct millimeter measurement.