Ring size guide

Find the perfect fit

Three ways to find your size, from most to least accurate. Still unsure? Order your best guess — your first resize within 60 days is free.

Request a free ring sizer

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Ring sizes US 5 to 10 with inside diameters

1. Free ring sizer

The most accurate option. We post a reusable sizer for free — it arrives in 2–4 days.

2. Measure a ring

Measure the inside diameter of a ring that fits the same finger and match it in the chart below.

3. String or paper

Wrap it around the base of your finger and measure the length. Least accurate — use only as a guide.

Size chart

US	UK	EU	Inside diameter	Inside circumference
5	J½	49	15.7 mm	49.3 mm
5.5	K½	50.5	16.1 mm	50.6 mm
6	L½	51.5	16.5 mm	51.9 mm
6.5	M½	53	16.9 mm	53.1 mm
7	N½	54	17.3 mm	54.4 mm
7.5	O½	55.5	17.7 mm	55.7 mm
8	P½	57	18.1 mm	57.0 mm
9	R½	59.5	18.9 mm	59.5 mm
10	T½	62	19.8 mm	62.1 mm
11	V½	64.5	20.6 mm	64.6 mm
12	Y	67	21.4 mm	67.2 mm

Measurements are inside dimensions. Wide bands (5 mm and over) fit more snugly — go up half a size.

Good to know

Which finger should I measure?

The finger you’ll wear the ring on — your dominant hand is usually up to half a size larger.

When should I measure?

At the end of the day, when your hands are warm. Fingers are smaller in the morning and in cold weather.

Is resizing free?

Your first resize within 60 days of delivery is free, including insured shipping both ways. Full-eternity bands are made to size and can’t be resized.

Buying a surprise engagement ring?

Borrow a ring she wears on her right hand (it’s usually half a size larger — we’ll adjust), or guess and use the free resize.