Ring Size Conversion Chart – A Complete Practical Guide

Choosing the right ring size is essential before ordering online or giving a piece of jewelry. Sizes vary from country to country: a US ring size doesn't always correspond directly to a French size. With this ring size guide and conversion chart (FR, US, UK, Europe), you can easily convert your finger measurement. Whether you're looking for a size 6 ring, a US size 7 or a size 8 ring in France, this guide will help you find the most accurate ring size conversion.

How do you find your ring size?

Measure with a ring you already own

The simplest way to find your ring size is to use a piece of jewelry you already wear.

1. Take a ring that fits the intended finger perfectly (for example a size 7 ring or a French size 54 ring).
2. Measure the inside diameter of the ring in millimeters using a ruler or calipers.
3. Compare this measurement with a ring size conversion chart to find the equivalent (e.g., a French size 54 corresponds to a US size 7).

Example:

• A ring diameter of 16.5 mm corresponds to a French size 52, or roughly a US size 6 ring.
• A diameter of 17.2 mm corresponds to a French size 54, or a US size 7.

Use a printable or physical ring sizer

For greater accuracy, you can:

• Download a printable ring sizer (a cut-out guide to measure your finger directly).
• Order a physical ring sizer that lets you try on different ring sizes.

This method is ideal if you're hesitating between several equivalents, such as a US size 6 ring or a size 7 ring in French and US sizing.

Tip: some jewelers offer a free ring sizer to help you choose between US, FR or UK ring sizes.

A tip if it's a gift

Giving a ring as a surprise (wedding band, engagement ring or diamond ring) can be tricky if you don't know the exact size. Here are a few solutions:

• Ask someone close to them: friends or family sometimes know the right women's ring size or men's ring size.
• Discreetly borrow a ring the person already wears and measure its inside diameter.
• Go with the average size: in France, the most common women's ring size is between 50 and 54, and the most common men's ring size between 58 and 62.

Practical example: if you're looking for a size 8 ring in France, this generally corresponds to a French size 57, or about 18.1 mm in diameter.

Ring size conversion charts

Ring sizes vary from one country to another: a US size 6 ring doesn't correspond directly to a French size. To help you, here are ring size conversion charts for France, the United States, the United Kingdom, Europe and Asia.

Ring size conversion: France / US

French size	US size (United States)
47	4.5
48	4.75
49	5
50	5.5
51	5.75
52	6
53	6.5
54	7
55	7.5
56	8
57	8.25
58	8.5
59	9
60	9.25
61	9.5
62	10
63	10.5
64	11
65	11.25
66	11.5
67	12
68	12.5

Example: a French size 54 corresponds to a US size 7, equivalent to an inside diameter of 17.2 mm.

Ring size conversion: France / UK (England)

French size	UK size (England)
47	H 1/2
48	I 1/2
49	J 1/2
50	L
51	L 1/2
52	M
53	N
54	O
55	P
56	P 1/2
57	Q
58	Q 1/2
59	R
60	R 1/2
61	S 1/2
62	T 1/2
63	U 1/2
64	V
65	V 1/2
66	W 1/2
67	Y
68	Z

Ring size conversion: France / Italy – Spain – Switzerland – Netherlands

French size	Italy / Spain / Switzerland / Netherlands
47	7
48	8
49	9
50	10
51	11
52	12
53	13
54	14
55	15
56	16
57	17
58	18
59	19
60	20
61	21
62	22
63	23
64	24
65	25
66	26
67	27
68	28

Ring size conversion: France / Japan – India – South America

French size	Japan / India / South America
47	7
48	8
49	9
50	10
51	11
52	12
53	13
54	14
55	15
56	16
57	17
58	18
59	19
60	20
61	21
62	22
63	23
64	24
65	25
66	26
67	27
68	28

Ring sizes in cm and mm (circumference & inside diameter)

French size	Circumference (mm)	Inside diameter (cm)
47	47 mm	1.50 cm
48	48 mm	1.53 cm
49	49 mm	1.57 cm
50	50 mm	1.60 cm
51	51 mm	1.64 cm
52	52 mm	1.65 cm
53	53 mm	1.70 cm
54	54 mm	1.72 cm
55	55 mm	1.75 cm
56	56 mm	1.78 cm
57	57 mm	1.83 cm
58	58 mm	1.85 cm
59	59 mm	1.90 cm
60	60 mm	1.92 cm
61	61 mm	1.94 cm
62	62 mm	1.97 cm
63	63 mm	2.00 cm
64	64 mm	2.04 cm
65	65 mm	2.07 cm
66	66 mm	2.10 cm
67	67 mm	2.13 cm
68	68 mm	2.16 cm

Most-searched size equivalents

To help you quickly find the right match, here are the most-searched equivalents between French and US ring sizes:

• US ring size 6 = French size 52 (16.5 mm diameter)
• US ring size 7 = French size 54 (17.2 mm diameter)
• US ring size 8 = French size 57 (18.1 mm diameter)
• US ring size 9 = French size 59 (19 mm diameter)
• US ring size 11 = French size 64 (20.4 mm diameter)
• US ring size 12 = French size 67 (21.3 mm diameter)

Practical example: if you're looking for the US equivalent of a size 54 ring, it corresponds to a size 7. Likewise, a French size 51 ring is roughly equivalent to a US size 5.75.

Quick guide – Women's vs. men's ring sizes

Ring sizes aren't the same for women and men. Here's a simple guide to help you:

Women's ring size

• The most common sizes in France range from 50 to 54.
• An average women's ring size is generally 52 or 53 (equivalent to a US size 6).
• For slimmer fingers, choose a size 48 to 50; for wider fingers, a size 55 to 56.

Men's ring size

• The most frequent sizes are between 58 and 62.
• The most common men's ring size is 60 (roughly equivalent to a US size 9).
• For wider fingers, sizes can go up to 66 or 67 (equivalent to a US size 12).

Advice: if you're torn between two sizes, always choose the slightly larger one. A ring that fits too tightly is uncomfortable, whereas an extra half size ensures better everyday comfort.

FAQ – Everything you need to know about ring sizes

What is a size 6 ring?
A US size 6 ring corresponds to a French size 52, or about 16.5 mm inside diameter. It's one of the most common women's sizes.

What does a size 7 ring convert to?
A US size 7 is equivalent to a French size 54 (about 17.2 mm in diameter). It's a very common size for women's rings.

How do you convert a US ring size to a French size?
Simply compare the inside diameter in millimeters with a conversion chart. For example, a US size 8 ring corresponds to a French size 57.

What is the average size for a women's ring?
In France, the most common size is 52 or 53, the equivalent of a US size 6 ring.

What is the average size for a men's ring?
Most men wear between 58 and 62 in French sizing, or about a US size 9 ring.

Discover our Laveran Paris ring collections

Once you've found the right ring size, let yourself be won over by creations from Laveran Paris.

Specializing in lab-grown diamonds set in 18k gold, our Maison offers modern, responsible and accessible jewelry.

Explore our collections:

• Lab-grown diamond engagement rings – elegance and brilliance to celebrate your love.
• Women's and men's wedding bands – timeless bands that seal a unique union.
• Rings set with colored diamonds – modern, refined and responsible creations.

With Laveran Paris, find the perfect ring in your size, made to last a lifetime and reflect your most beautiful emotions.

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• What should you engrave on a wedding band?

• Celebrating every month of marriage: monthly "mini anniversaries" explained

• Do men wear an engagement ring?

• When are the wedding bands exchanged during the ceremony?

• Ring too big? Tips and advice