How Long Is a 20 Inch Chain? | The Truth About Fit

A 20-inch chain measures 20 inches end-to-end, about 50.8 cm, and typically rests at or just below the collarbone.

For the full breakdown, see our best 20 Inch Silver Chain guide.

Whether you are buying a first chain or replacing an old one, “20 inch” sounds straightforward — but the fit surprises plenty of people. The measurement includes the clasp, and exactly where it lands varies with your neck size, body type, and whether you add a pendant. Here is what that length actually means, how to measure it right, and the mistakes that lead to returns.

What Does 20 Inches Mean In Practice?

Twenty inches converts to roughly 50.8 centimeters. On most men, this length sits right at the collarbone. On many women, it hangs just below it. Jewelry size charts often list 20 inches as a standard men’s chain length, while others classify it as the start of the matinee range — the Gem Society’s necklace size charts place matinee lengths from 20 to 24 inches.

The key convention: the stated length covers the entire piece. When a label says 20 inches, the clasp is included in that measurement. You are getting a chain that measures 20 inches from one end of the clasp to the other when lying flat, not 20 inches of visible links plus extra hardware.

How To Measure A Chain Correctly

Checking a chain you already own is a two-minute job. Lay it flat on a surface and measure from the very end of the clasp to the opposite end — the full length, hardware included. That number is the true size.

If you are sizing for a new chain rather than checking an existing one, use a soft tape or a piece of string. Wrap it around your neck where you want the chain to rest, note where it meets, then lay that length against a ruler. That measurement tells you which standard size to order.

Common Fit Mistakes To Skip

• Counting only the links. Many guides state that the full piece — clasp included — is what the label refers to. Assuming 20 inches means 20 inches of visible chain alone will leave you with a piece that hangs longer than expected.
• Expecting one drape for everyone. Fit varies by neck size, body shape, neckline, and pendant weight. A heavier pendant pulls a chain lower and changes how it sits.
• Rounding the conversion. 20 inches equals about 50.8 cm, not exactly 50 cm. That small difference matters when comparing against a metric size chart.

Tiffany & Co.’s necklace size guide lists 20 inches as 50.75 cm, confirming the same conversion.

Where A 20-Inch Chain Sits On You

The honest answer is that placement shifts from person to person. A 20-inch chain worn alone will sit differently than the same chain with a pendant pulling it downward. Necklines also change the visual effect — a crew neck holds the chain higher against the fabric, while a V-neck lets it drop lower.

Some product lines even offer adjustability. One cited example notes a 20-inch cable chain that adjusts down to 18 inches and 16 inches, giving you three lengths in one purchase. Check the product details before ordering; if adjustability matters to you, look for that feature specifically.

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