The Challenge
Jewelry is sized in inches in the US and UK, centimeters in Europe and Asia. A 16-inch necklace is 40.6cm — the standard choker-adjacent length that sits at the collarbone. An 18-inch chain (45.7cm) is the most common necklace length sold globally. When ordering from international retailers or custom jewelers, getting this wrong means a chain that sits at your chest when you wanted it at your collar. The conversion is straightforward: multiply inches by 2.54. What matters in jewelry is knowing where each length actually falls on the body — a 24-inch (61cm) chain sits at the sternum, a 30-inch (76.2cm) chain reaches the navel. Body proportions affect this, but standard sizing assumes an average adult frame.
Necklace Length Chart: Inches to cm with Body Placement
| Length (inches) | Length (cm) | Style Name | Sits At |
|---|---|---|---|
| 14 in | 35.56 cm | Collar | Base of throat, tight fit |
| 15 in | 38.10 cm | Collar/Choker | Throat |
| 16 in | 40.64 cm | Choker | Collarbone |
| 17 in | 43.18 cm | Choker/Princess | Just below collarbone |
| 18 in | 45.72 cm | Princess | Below collarbone |
| 20 in | 50.80 cm | Princess/Matinee | Upper chest |
| 22 in | 55.88 cm | Matinee | Mid-chest |
| 24 in | 60.96 cm | Matinee | Sternum / top of bust |
| 28 in | 71.12 cm | Opera | Below bust |
| 30 in | 76.20 cm | Opera | At navel |
| 36 in | 91.44 cm | Rope | Below navel |
| 40 in | 101.60 cm | Rope/Lariat | Hip level |
Bracelet and Anklet Length Conversion
| Length (inches) | Length (cm) | Typical Fit |
|---|---|---|
| 6.5 in | 16.51 cm | Small women's wrist, snug |
| 7 in | 17.78 cm | Women's standard |
| 7.5 in | 19.05 cm | Women's large / men's small |
| 8 in | 20.32 cm | Men's standard |
| 8.5 in | 21.59 cm | Men's large |
| 9 in | 22.86 cm | Men's XL / adjustable |
| 9.5 in | 24.13 cm | Women's anklet standard |
| 10 in | 25.40 cm | Anklet standard |
| 11 in | 27.94 cm | Anklet large / adjustable |
Why Jewelry Chain Lengths Are Listed Differently by Country
US and UK jewelers size chains in inches; European, Scandinavian, and most Asian jewelers use centimeters. The disconnect causes real ordering problems — a shopper searching for an 18-inch chain on a French marketplace sees 45cm or 46cm listings and isn't sure which is correct. 45cm = 17.72 inches, 46cm = 18.11 inches. Both round to 18 inches in practice. Chinese and Korean jewelry exporters often use mm for fine chains — a 450mm chain is the same 18-inch standard. When in doubt, measure a chain you already own and compare.
How to Choose the Right Chain Length Without Trying It On
- Use a flexible measuring tape or a piece of string around your neck at the position you want the chain to sit
- Note the measurement in cm — this is your target chain length, not your neck circumference
- If you want a pendant to hang at a specific point, add the pendant drop length to your base measurement
- Order the next standard size up if between sizes — most chains include a 1–2 inch (2.5–5cm) extender
Choosing Chain Length: What Works vs What to Avoid
Step-by-Step Workflow
Enter your chain length in inches
Centimeter result appears — use this when ordering from European or Asian jewelers
Cross-reference with the body placement chart below to confirm the length suits your neckline
Specifications
- Formula
- cm = inches × 2.54
- 16 in (choker)
- 40.64 cm — sits at collarbone
- 18 in (standard)
- 45.72 cm — below collarbone
- 20 in (princess)
- 50.80 cm — on the chest
- 24 in (matinee)
- 60.96 cm — at or above sternum
- 30 in (opera)
- 76.20 cm — at navel
- 36 in (rope)
- 91.44 cm — below navel
Best Practices
- Add 2–4 inches (5–10cm) to your preferred length if wearing over a high neckline or chunky knit
- Men's necklaces typically run 20–24 inches (50.8–60.96cm) — longer than women's standard 16–18 inches
- Pendant drop adds effective visual length — a 2-inch pendant on an 18-inch chain reads like a 20-inch chain
- For layering: space chains 2 inches (5cm) apart — 16in + 18in + 20in is the classic three-layer set
- Bracelet standard: 7 inches (17.78cm) for women, 8 inches (20.32cm) for men — add 1cm for comfort fit
Frequently Asked Questions
What is the most common necklace length in centimeters?
18 inches = 45.72cm is the global standard — it ships as the default length with most pendants and sits just below the collarbone on an average adult. European jewelers list this as 45cm or 46cm. The slight rounding is normal; chains are rarely cut to sub-millimeter precision.
What is a 40cm chain in inches?
40cm ÷ 2.54 = 15.75 inches, effectively a 16-inch chain. This is the standard choker length in European sizing — it sits directly at the base of the throat on most adults. Common in European and Asian jewelry markets where cm sizing is standard.
How long is a 45cm necklace in inches?
45cm ÷ 2.54 = 17.72 inches, closest to an 18-inch chain. Most European jewelers label their standard pendant chain as 45cm. When a US retailer says 18 inches and a French retailer says 45cm, they're selling the same length within 0.28 inches (7mm) — negligible for necklace wear.
What chain length should I order for a pendant?
For a pendant that sits at center chest: order 18 inches (45.72cm). For a pendant worn over clothing or a higher neckline: 20–22 inches (50.8–55.9cm). For a long statement pendant: 24 inches (60.96cm). Remember the pendant itself adds length — a 3cm pendant on an 18-inch chain positions the pendant tip at roughly 20-inch depth.
How do I measure my own chain length?
Lay the chain flat on a ruler from end clasp to end clasp. Measure in cm and divide by 2.54 for inches. Alternatively, use a soft measuring tape around your neck at the position you want the chain to sit, then add 1–2cm for clasp and links. Most chains have 1–2 inch extenders — check before ordering a longer replacement.
What is the difference between a 16-inch and 18-inch necklace?
Two inches = 5.08cm difference in total length, which adds 2.54cm of drop since the chain hangs from both sides. A 16-inch (40.6cm) chain sits at the collarbone. An 18-inch (45.7cm) chain sits 2.54cm lower — just below the collarbone. On a petite frame the difference is more pronounced; on a taller frame both may sit near the same visual zone.
Are jewelry chain lengths the same for men and women?
The conversion formula is identical, but sizing conventions differ. Women's standard is 16–18 inches (40.6–45.7cm). Men's standard is 20–24 inches (50.8–60.96cm) to account for broader shoulders and longer torsos. A 20-inch chain on a woman sits at mid-chest; the same chain on a man typically sits at the collarbone.