Last updated: 2026-07-31
A bead size reference chart converts common bead diameters from millimeters to inches and estimates how many beads fit on a 16-inch strand—for example, 4 mm beads are about 0.16 inches and yield roughly 100 beads per strand, while 8 mm beads are about 0.31 inches and yield about 50 beads per strand.
Accurate bead sizing prevents short strands, over-ordering, and mismatched findings. This guide gives mm-to-inch conversions, typical beads-per-strand counts, and practical buying tips from a Yiwu factory-direct supplier of beads, charms, and DIY jewelry findings for both wholesale cartons and single-sample retail orders.
Key Takeaways
- Bead diameter is sold in millimeters; divide by 25.4 for inches (e.g., 6 mm ≈ 0.24 in).
- A 16-inch strand holds roughly 100 × 4 mm beads, 67 × 6 mm beads, or 50 × 8 mm beads before clasp and knot allowance.
- Hole size, shape, and stringing material change usable count more than the label alone—always leave 1–2 inches for clasp and finish.
- Yuhive ships beads and findings worldwide from Yiwu to 30+ countries, with quotes usually within 24 hours and ready-stock processing in 1–3 business days.
- For mixed styles, smaller multi-size packs often sell faster than one bulk size—test, then reorder.
What Is a Bead Size Reference Chart (mm to Inches)?
A bead size reference chart lists standard bead diameters in millimeters alongside their inch equivalents and approximate strand yields so makers and buyers can plan length, quantity, and hole-compatible findings without guessing. Millimeters are the industry default for glass, acrylic, crystal, and metal beads; inches are useful for US retail packaging and pattern books. One inch equals 25.4 mm, so a 10 mm bead is about 0.39 inches. Charts do not replace calipers for tight hole-to-wire fits, but they are the fastest way to compare listings, estimate strand fills, and order the right mix of sizes for bracelets, necklaces, and charm accents from a large, continually expanding in-stock range.
At Yuhive, beads sit alongside zinc-alloy charms, pendants, earrings, and DIY findings—similar in breadth to sourcing across the Yiwu International Trade City—so size consistency matters when you pair beads with jump rings, ear wires, and cabochon trays in one order.
How Do You Convert Bead Size from mm to Inches?
To convert bead size from millimeters to inches, divide the millimeter measurement by 25.4. For example, 4 ÷ 25.4 ≈ 0.16 inches, 6 ÷ 25.4 ≈ 0.24 inches, and 8 ÷ 25.4 ≈ 0.31 inches. Round to two decimal places for everyday DIY use; keep three places only when matching precision-drilled holes to wire gauge. Sellers almost always list diameter (the across-the-bead measurement), not radius. If a listing says “6 mm round,” treat 6 mm as the outer diameter for spacing and strand math. When hole diameter is given separately (often 0.8–1.5 mm on fashion beads), use that figure only for wire, cord, or pin selection—not for strand count.
- Formula: inches = mm ÷ 25.4
- Formula: mm = inches × 25.4
- Quick check: 2 mm ≈ 1/12 in; 3 mm ≈ 1/8 in; 6 mm ≈ 1/4 in; 12 mm ≈ 1/2 in
Bead Size Chart: mm, Inches, and Beads per 16-Inch Strand
The table below is the practical core of any bead size chart: common diameters, inch equivalents, and approximate counts on a 16-inch (about 40.6 cm) strand when beads sit side by side with little gap. Counts assume round beads of uniform size. Faceted, bicone, rondelle, and irregular shapes pack differently. Always subtract space for clasp, crimps, and end knots—typically leave 1–2 inches of working length so a finished necklace or bracelet does not feel short.
| Bead size (mm) | Approx. inches | Beads per 16" strand | Typical uses |
|---|---|---|---|
| 2 mm | 0.08 in | ~203 | Seed-style spacers, fine multi-strand |
| 3 mm | 0.12 in | ~135 | Delicate bracelets, earring accents |
| 4 mm | 0.16 in | ~100 | Everyday bracelets, light necklaces |
| 6 mm | 0.24 in | ~67 | Standard fashion strands, mixed sets |
| 8 mm | 0.31 in | ~50 | Bold bracelets, short statement strands |
| 10 mm | 0.39 in | ~40 | Statement pieces, spaced designs |
| 12 mm | 0.47 in | ~33 | Focal accents, fewer beads per inch |
| 14 mm | 0.55 in | ~29 | Large focals; pair with metal findings |
| 16 mm | 0.63 in | ~25 | Chunky accent beads, sparse layouts |
Rule of thumb: beads per 16-inch strand ≈ 406 ÷ bead diameter in mm (because 16 × 25.4 ≈ 406 mm of linear length). Real strands vary with hole depth, coating thickness, and how tightly you string.
How Many Beads Do I Need for a Bracelet or Necklace?
Plan finished length first, then convert to bead count by size. A common adult bracelet target is 7–7.5 inches including clasp; a choker-style necklace often lands near 16 inches; a longer fashion necklace may run 18–24 inches. For a 7-inch bracelet made only of 6 mm rounds, you need about 7 × 25.4 ÷ 6 ≈ 30 beads, plus allowance for the clasp assembly. For a 16-inch beaded section of 8 mm rounds, plan about 50 beads. Mixed sizes require adding each segment’s length in mm, not averaging diameters loosely. When you also hang charms and pendants, leave extra free space so charms sit flat and do not crowd the strand.
- Choose finished length (wrist or neck measurement + ease + clasp).
- Reserve 0.5–1 inch for clasp, jump rings, and finish hardware.
- Convert remaining inches to mm (× 25.4), divide by bead diameter in mm.
- Round up slightly for breakage, discards, and design revisions.
- For wholesale restocks, order by style mix, not one mega-size only.
A small shop should not buy 500 of one style. Buy 50 of ten styles, watch what sells, then reorder — that is how Yiwu itself works.
— Dong Jiang, Founder of Yuhive
That approach fits bead assortment buying especially well: test 4 mm, 6 mm, and 8 mm bestsellers before locking carton quantities. Compare channel options in our guide to Fire Mountain Gems vs factory-direct beads wholesale when you move from craft-store packs to bulk strands.
Which Bead Sizes Pair Best with Jewelry Findings?
Findings must clear the bead hole and look proportional to the bead diameter. Small 2–4 mm beads suit fine chain, thin head pins, and delicate ear wires; 6–8 mm beads are the workhorse range for most fashion bracelets, necklaces, and earring drops; 10–14 mm focals need sturdier pins, thicker cord, or wire-wrapped loops. Jump ring and split ring outer diameters should exceed the bead profile enough that metal does not hide the bead’s face. For a parallel mm reference on hardware itself, see our keychain hardware size chart for split rings, jump rings, and clasps. Browse matching components in the findings & components collection and the beads collection.
- 2–3 mm: seed-style spacers; fine silk or thin beading wire
- 4–6 mm: everyday multi-strand and earring clusters
- 8–10 mm: single-strand fashion pieces and charm spacing
- 12 mm+: focals; use metal spacers or enamel accents for rhythm
Zinc-alloy findings and cast charms—often from the Zamak family of zinc alloys—pair cleanly with glass and acrylic beads when plating and weight balance are considered. For broader material trade-offs, see zinc alloy vs stainless steel vs brass for jewelry. Costume and fashion jewelry buyers planning promo or gift assortments should note that the U.S. promotional products industry sales total roughly $26 billion a year, according to PPAI research—beaded accents and logo charms often share the same wholesale carts as branded metal goods.
How Should Wholesale Buyers Order Beads by Size?
Wholesale bead orders work best when size, hole consistency, and packaging are specified up front, then confirmed with a sample before carton quantities. Factory-direct suppliers in Yiwu typically support single samples and small trial packs through full cartons, which is ideal for gift shops, marketplace sellers, craft supply stores, and apparel brands testing colorways. Request photos of actual strand lots when possible; surface coating and hole alignment are easier to judge visually than from a size number alone. Quotes at Yuhive are usually answered within 24 hours during China business hours. Ready-stock orders are typically processed within 1–3 business days; after dispatch, shipping often takes about 5–12 business days to the United States and 7–20 business days to most other destinations among 30+ countries served from the Yiwu warehouse.
- Specify diameter (mm), shape, material, hole size, and color code
- Confirm strand length or loose-count packaging before pricing
- Order mixed sizes for sell-through tests; scale winners later
- Match findings (clasps, pins, jump rings) in the same PO when possible
- Use wholesale & custom orders for bulk, cartons, and promotional projects
Typical industry pack pricing varies widely by material and finish; treat marketplace “per strand” numbers only as rough market ranges and request a quote for current stock. Custom zinc-alloy charms or logo tags that hang with bead strands start from artwork, drawings, or product photos, with feasibility, quantity, and production time confirmed before payment—ready stock ships fast; true made-to-order work needs realistic lead time. For craft-store vs factory packing economics, see craft store vs factory direct jewelry findings.
FAQ
How many 6 mm beads are on a 16-inch strand?
About 67 beads if they sit edge to edge. Leave length for clasp and knots so the finished piece does not run short.
Is bead size the diameter or the hole?
Listings almost always mean outer diameter in mm. Hole size is a separate measurement used for wire or cord selection.
How do I convert 8 mm beads to inches?
Divide by 25.4: 8 ÷ 25.4 ≈ 0.31 inches. Use that figure when US patterns call for inch sizes.
Do faceted beads use the same strand counts?
Use the chart as a starting point only. Facets and rondelles change effective packing; measure a short sample string when count accuracy matters.
Can I order mixed bead sizes in small quantities?
Yes. Yuhive accepts single samples and small trial orders up through cartons, so you can mix sizes before committing to bulk of one SKU.
What shipping time should US buyers expect for ready-stock beads?
Ready-stock is usually processed in 1–3 business days; after dispatch, US deliveries often take about 5–12 business days, with 7–20 business days common for many other destinations.
Need a size-matched assortment of beads, findings, or charms for retail or wholesale? Email sales@keychainco.com or WhatsApp +86 151 2288 2244 for a quote—most inquiries are answered within 24 hours during China business hours. Explore the full catalog at all products or start with the beads collection.
Written by Dong Jiang, Founder of Yuhive — factory-direct fashion jewelry, charms, pendants and DIY findings from Yiwu, China, for both wholesale and retail buyers.