Ring Size Chart: A Comprehensive Guide to Finding the Perfect Fit

When it comes to buying a ring—whether it’s an engagement ring, right hand rings, or a special gift—getting the right size is essential. A well-fitting ring should slide on easily and have just enough resistance to stay secure. This guide breaks down everything you need to know about ring sizing, including how to measure your finger, how to read a ring size chart, and tips for international conversions.

Why Ring Size Matters

A ring that’s too tight can be uncomfortable or even painful, while one that’s too loose can slip off and get lost. The perfect fit enhances both comfort and style—especially for diamond rings worn daily like engagement or wedding bands.

Standard Ring Size Chart (U.S. Measurements)

Ring Size	Inside Diameter	Inside Circumference
4	14.8 mm	46.8 mm
5	15.7 mm	49.3 mm
6	16.5 mm	51.9 mm
7	17.3 mm	54.4 mm
8	18.1 mm	57.0 mm
9	18.9 mm	59.5 mm
10	19.8 mm	62.1 mm
11	20.6 mm	64.6 mm
12	21.4 mm	67.2 mm

Ring Size Conversion Chart

If you’re shopping internationally, use this chart to convert between sizes:

U.S.	UK	Europe	Japan	Australia
4	H	46	7	H
5	J	49	9	J½
6	L	51.5	11	L½
7	N	54	14	N½
8	P	57	16	P½
9	R	59	18	R½
10	T	62	20	T½

Ring Size Chart in cm (U.S. Sizes)

Here’s a helpful ring size chart in centimeters, showing both inside diameter and circumference:

U.S. Size	Inside Diameter (cm)	Circumference (cm)
4	1.48 cm	4.68 cm
5	1.57 cm	4.93 cm
6	1.65 cm	5.19 cm
7	1.73 cm	5.44 cm
8	1.81 cm	5.70 cm
9	1.89 cm	5.95 cm
10	1.98 cm	6.21 cm
11	2.06 cm	6.46 cm
12	2.14 cm	6.72 cm

How to Tell Your Ring Size

Here are the most common and accurate ways to determine engagement ring fitting or ring size:

1. Measure Your Finger with a Strip of Paper or String

• Cut a thin strip of paper or use a string.
• Wrap it around the base of your finger.
• Mark where the ends meet.
• Measure the length using a ruler in centimeters.
• Use the chart to match your measurement with the correct ring size.

2. Use a Ring That Fits You

• Take a ring that already fits your desired finger.
• Measure the inside diameter of the ring in centimeters.
• Refer to the chart to find the corresponding ring size.

3. Order a Ring Sizer or Visit a Jeweler

• If you want the most precise measurement, use a plastic or metal ring sizer.
• Visiting a jeweler is always the most accurate method, especially for high-value rings.

Ring Size Chart for Men and Women

While ring sizes are unisex and based on measurements, men’s and women’s fingers typically fall into different size ranges due to physiological differences. Below are tailored charts with average size ranges for each.

Women’s Ring Size Chart

• Average Sizes: US 6–7 (UK L–N, EU 51–54, Circumference 5.19–5.44 cm).
• Common Range: US 4–9 (UK H–R, EU 46–59, Circumference 4.68–5.95 cm).

US Size	UK Size	EU Size	Circumference	Diameter (cm)
4	H	46	4.68	1.49
4.5	I	48	4.80	1.53
5	J	49	4.93	1.57
5.5	K	50	5.06	1.61
6	L	51	5.19	1.65
6.5	M	52	5.31	1.69
7	N	54	5.44	1.73
7.5	O	55	5.57	1.77
8	P	56	5.70	1.81
8.5	Q	57	5.83	1.85
9	R	59	5.95	1.89

Men’s Ring Size Chart

• Average Sizes: US 9–10 (UK R–T, EU 59–61, Circumference 5.95–6.21 cm).
• Common Range: US 7–13 (UK N–Z, EU 54–68, Circumference 5.44–6.97 cm).

US Size	UK Size	EU Size	Circumference	Diameter (cm)
7	N	54	5.44	1.73
7.5	O	55	5.57	1.77
8	P	56	5.70	1.81
8.5	Q	57	5.83	1.85
9	R	59	5.95	1.89
9.5	S	60	6.08	1.94
10	T	61	6.21	1.98
10.5	U	62	6.34	2.02
11	V	64	6.46	2.06
11.5	W	65	6.59	2.10
12	X	66	6.72	2.14
12.5	Y	67	6.85	2.18
13	Z	68	6.97	2.22

Tips for Accurate Ring Sizing

1. Measure Multiple Times: Measure your finger 2–3 times to ensure consistency.
2. Consider Knuckle Size: If your knuckles are larger than the base of your finger, measure both and choose a size that fits comfortably over the knuckle.
3. Account for Ring Width: Wider bands (over 6mm) may require a slightly larger size for comfort. Add 0.25–0.5 size up for wide rings.
4. Time of Day: Fingers can swell in the evening or after exercise, so measure in the afternoon for a balanced fit.
5. Climate and Weight Changes: Fingers may change size due to temperature, pregnancy, or weight fluctuations. Re-measure if needed.

Common Ring Size FAQs

• What if I’m between sizes? Choose the larger size for comfort, especially for wider rings.
• Can I resize a ring? Most rings can be resized by a jeweler, but some materials (like titanium or certain gemstone settings) may be difficult to adjust.
• How do I size a ring for someone else? Borrow a ring they wear on the same finger and measure its diameter, or use a ring sizer discreetly.
• What’s the average ring size? For women, the average ring size is typically 6; for men, it’s 9 to 10.

Finding your perfect size guide doesn’t have to be complicated. With the right tools and a clear ring size chart, you can confidently shop for your engagement ring online, knowing it will be the perfect fit. A ring that fits just right is more than comfortable—it’s a reflection of you or your loved one’s unique style and care.