What does 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm Look Like?

Trying to picture how wide a 2mm, 4mm, 6mm or 8mm ring really is? Millimeters are hard to imagine, so here's an easy trick using coins you already have in your pocket, plus inch conversions and a guide to which ring width suits you.

Quick answer: ring widths in inches and coins

Width	In inches	Roughly the same as	Typical ring style
2mm	0.08" (about 5/64")	1 nickel	Thin stacking band
3mm	0.12" (about 1/8")	2 pennies	Slim women's band
4mm	0.16" (about 5/32")	2 nickels	Classic women's band
5mm	0.20" (just over 3/16")	1 nickel + 2 pennies	Women's or slim men's band
6mm	0.24" (just under 1/4")	3 nickels	Unisex, understated men's band
7mm	0.28" (about 9/32")	4 quarters	Popular men's band
8mm	0.31" (about 5/16")	4 nickels	Most popular men's band
9mm	0.35" (just under 3/8")	6 pennies	Wide men's band
10mm	0.39" (just over 3/8")	5 nickels	Bold, extra-wide band

One inch is 25.4mm, so a 10mm ring is a little less than half an inch wide.

The coin trick: see any width at home

Grab a few US coins and stack them flat. The height of the stack shows you how wide the ring would look on your finger. Here's how thick each coin is:

Nickel: about 2mm (1.95mm)
Quarter: about 1.75mm
Penny: about 1.5mm
Dime: about 1.35mm

The easiest rule to remember: every nickel is about 2mm. Two nickels show you a 4mm ring, three show you 6mm, four show you 8mm and five show you 10mm. For the in-between sizes, use the combinations in the table above.

Tip: hold the stack against the finger you'll wear the ring on and look at it in a mirror. That gives you the most realistic idea of how the ring will look on your hand.

Other ways to picture ring widths

Use a ruler. Most rulers have millimeter marks. Find the width you're considering and hold it across your finger.
Measure a ring you already own. Measure across the top of the band in millimeters to see the width you're used to.
Compare to a watch strap or bracelet you know, if you know its width.

Which ring width is right for you?

2mm to 3mm: delicate and minimal. Great for women's bands, stacking with an engagement ring, or anyone who wants a barely-there look.
4mm to 5mm: the classic women's width, and a good slim option for men with smaller hands or a more subtle style.
6mm: a versatile middle ground that works for both men and women. Understated but substantial.
7mm to 8mm: the most popular men's widths. They look proportional on most men's hands. If you're not sure, 8mm is the safe choice.
9mm to 10mm: bold and noticeable. Best for larger hands or anyone who wants a statement ring.

Sizing tip: wider rings cover more of your finger, so they can feel a little snugger than a thin band in the same size. All our rings are comfort fit, which helps, but if you're between sizes and choosing a wide band, go with the larger size. See our ring size guide or learn how to find your ring size at home.

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Frequently asked questions

How thick is 4mm?

4mm is about 0.16 inches, or a little more than 1/8 inch. Two nickels stacked together are almost exactly 4mm.

What does 2mm look like?

2mm is about the thickness of a single US nickel, or a little less than 1/10 of an inch. As a ring, it's a thin, delicate band.

Is 8mm too wide for a men's wedding band?

No. 8mm is the most popular men's width and looks proportional on most hands. If you have slimmer fingers or prefer a subtler look, 6mm or 7mm is a good alternative.