What is the working allowance?

The working allowance is extra string (typically 10–15 cm / 4–6 inches) needed to tie knots, attach a clasp, and finish the ends. This tool adds a recommended 10 cm by default, but you can adjust it.

Should I measure bead diameter before or after stringing?

Measure the actual bead hole-to-hole length (or outside diameter for round beads) before stringing. For irregular beads use the longest measurement.

Does spacing include the bead holes?

No. The spacing value is the gap between the outer edges of adjacent beads. If your beads touch edge-to-edge, enter 0.

How do I measure clasp length?

Measure the finished length of your clasp hardware end-to-end when closed. Most lobster clasps add 12–20 mm; toggle clasps 20–30 mm. Check the product listing if unsure.

Can I use this for knotted designs?

Yes. Set spacing equal to the size of your knots (typically 1–2 mm for silk thread). The gap is applied across (bead count − 1) joints automatically.

How long is one strand of beads?

A standard loose bead strand is about 15–16 inches (38–40 cm), holding roughly 48 beads at 8 mm or 96 beads at 4 mm. Enter your bead size and count here for an exact length.

How much string do I need for a beaded friendship bracelet?

For a 7-inch (18 cm) beaded bracelet, allow the bead span plus the clasp plus a 4–6 inch (10–15 cm) working tail for knotting — this tool adds that allowance for you.

Bead String Length Calculator

Name: Bead String Length Calculator
Availability: InStock
Author: Nham Vu

Enter bead count, bead diameter, spacing, and clasp length to get the exact string or wire needed, in inches, cm, or mm.

Design Parameters

Number of beads

Bead diameter (mm)

Spacing between beads (mm)

Gap between outer edges of adjacent beads. Use 0 if beads touch.

Clasp length (mm)

Total length the clasp hardware adds when closed.

Working allowance (mm)

Extra string for tying knots and finishing ends (100 mm = ~4 in recommended).

Display unit

String Length Results

Recommended Total Length

—

Beads span

—

Spacing span

—

Clasp

—

Allowance

—

Finished jewelry length: — (beads + spacing + clasp, no allowance)

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Summary

Enter bead count, bead diameter, spacing, and clasp length to get the exact string or wire needed, in inches, cm, or mm.

How it works

Enter the total number of beads in your design.
Set the diameter of each bead in millimeters.
Set the spacing (gap) between beads in millimeters — 0 if beads touch.
Enter the combined length your clasp hardware adds (check package specs).
Choose your preferred unit (mm, cm, or inches) for the result.
The calculator instantly shows the minimum string length plus a recommended working allowance.

Use cases

Plan wire purchases before starting a necklace project.
Calculate thread needed for a beaded bracelet with seed beads.
Compare string lengths for different bead sizes on the same design.
Avoid running short mid-project by factoring in the working allowance.
Scale a pattern up or down by adjusting bead count.

Frequently Asked Questions

Last updated: 2026-06-19 · Reviewed by Nham Vu