Bead Loom Width Calculator

How bead loom weaving works:

A bead loom holds parallel warp threads under tension. Beads are threaded onto a weft (horizontal) thread and pushed up between the warp threads, one bead per gap. The number of warp threads is always one more than the number of beads per row.

Core formula:

Warp threads = Beads per row + 1

Loom width needed = Beads per row × Bead width

Bead sizes and dimensions:

Seed beads are sized using the aught system (the larger the number, the smaller the bead):

These are the same figures every other beadwork calculator on this site uses, so a bead count worked out here matches what the bead count calculator reports for the same dimensions.

Total warp thread length:

Thread per warp = Project length + (2 × loom waste)

Loom waste is the thread tied to the loom at each end, typically 6 to 12 inches per end depending on your loom and finishing method.

Total warp thread = (Project length + waste) × Number of warps

Note that this page gives you the raw figure with no buffer on it. Threads break and knots fail, so add 10% to 15% before you buy. Our warp thread calculator applies that buffer for you and lets you pick it by experience level.

Worked example:

A bracelet 7 inches long, 1.5 inches wide, using 11/0 Delica beads:

• Beads per row: 1.5 ÷ 0.063" (1.6 mm) = 24 beads
• Warp threads: 24 + 1 = 25 threads
• Rows: 7 ÷ 0.051" (1.3 mm) = 137 rows
• Total beads: 24 × 137 = 3,288 beads
• Thread per warp: 7 + 12 + 12 = 31 inches
• Total warp thread: 31 × 25 = 775 inches (64.6 feet)
• Weft thread (estimated): (24 beads × 0.063" width × 2) + 1" per row = 4.02" × 137 = 551 inches (45.9 feet)

Those two add to about 110 feet of thread for one bracelet, which surprises people the first time. Warp is the bulk of it, and most of that is the 24 inches of loom waste on every single warp thread. Shortening the waste to 6 inches per end drops the warp total to 475 inches, so a shorter loom tie-on is worth real money over a run of bracelets.

Warp thread material:

• Nymo B or D: Most common, nylon, slight stretch
• FireLine 6 lb: Zero stretch, strong, excellent for loom work
• C-Lon D: Good general purpose, nylon
• Beading wire: Not recommended for loom work (too stiff)

Finishing methods:

The biggest challenge in loom work is finishing the warp thread ends. Options:

1. Weave back each thread through the beadwork (time-consuming but secure)
2. Fold and glue under a backing (leather, ultrasuede)
3. Attach end caps or ribbon crimps for bracelets

Pattern note: For symmetrical patterns, use an odd number of beads per row so the center bead aligns. For patterns with a center line, use an even number.