We prepared a ring sizing guide because buying a ring will be one of the most significant purchases of your life and you need to find the perfect fit. Having your finger professionally measured by a local jeweler is the most reliable way to determine your ring size, but this guide offers helpful tips on how to find out the right size with ease from the comfort of your own home.

We recommend measuring your finger or ring multiple times to ensure the accuracy of your ring sizing. Your ring should fit your finger comfortably; snug enough so that it will not fall off, but loose enough to slide over your knuckle with some resistance.

Measure a Ring You Already Own

A simple way to get the ring sizing done is by measuring the inner diameter of a ring that fits on the intended finger. Find the measurement in the conversion chart.

Measure Your Finger

Use a measuring tape, a piece of string, ribbon, floss, or a strip of paper to measure your finger. Wrap it around the base of your finger, marking where the string or floss first overlaps with a pen. Then, line it up with a ruler, take down its length in millimeters, and look up the measurement on the chart to find the corresponding ring size.

When measuring your finger, the most important thing is to consider your knuckle, as it is usually the widest part – this is essential when doing ring sizing. Cold weather can cause your fingers to shrink a bit, while heat, medication, or illness can cause the fingers to swell. The best time to measure your finger at the end of the day and when your hands are warm.

Inside Diameter  Inside Circumference Sizes
MM Inches MM Inches UK  US EU
9.91 0.390 31.13 1.22 0000
10.72 0.442 33.68 1.39 00
11.53 0.454 36.22 1.43 0
11.95 0.474 37.54 1.49 A 1/2
12.18 0.482 38.26 1.51 A 1/2 3/4
12.37 0.487 38.86 1.53 B 1
12.60 0.496 39.58 1.56 B 1/2 1 1/4
12.78 0.503 40.15 1.58 C 1 1/2
13.00 0.512 40.84 1.61 C 1/2 1 3/4
13.21 0.520 41.50 1.63 D 2 41 1/2
13.41 0.528 42.13 1.66 D 1/2 2 1/4
13.61 0.536 42.76 1.68 E 2 1/2 42 3/4
13.83 0.544 43.45 1.71 E 1/2 2 3/4
14.05 0.553 44.14 1.74 F 3 44
14.15 0.557 44.45 1.75 F 1/2 3 1/8
14.25 0.561 44.77 1.76 F 3/4 3 1/4
14.36 0.565 45.11 1.77 G 3 3/8 45 1/4
14.45 0.569 45.40 1.79 G 1/4 3 1/2
14.56 0.573 45.74 1.80 G 1/2 3 5/8
14.65 0.577 46.02 1.81 H 3 3/4 46 1/2
14.86 0.585 46.68 1.84 H 1/2 4
15.04 0.592 47.25 1.86 I 4 1/4 47 3/4
15.27 0.601 47.97 1.89 I 1/2 4 1/2
15.40 0.606 48.38 1.90 J 4 5/8 49
15.53 0.611 48.79 1.92 J 1/4 4 3/4
15.70 0.618 49.32 1.94 J 1/2 5
15.80 0.622 49.64 1.95 K 5 1/8 50
15.90 0.626 49.95 1.97 K 1/4 5 1/4
16.00 0.630 50.27 1.98 K 1/2 5 3/8
16.10 0.634 50.58 1.99 L 5 1/2 51 3/4
16.30 0.642 51.21 2.02 L 1/4 5 3/4
16.41 0.646 51.55 2.03 L 1/2 5 7/8
16.51 0.650 51.87 2.04 M 6 52 3/4
16.71 0.658 52.50 2.07 M 1/2 6 1/4
16.92 0.666 53.16 2.09 N 6 1/2 54
17.13 0.674 53.82 2.12 N 1/2 6 3/4
17.35 0.683 54.51 2.15 O 7 55 1/4
17.45 0.687 54.82 2.16 O 1/2 7 1/4
17.75 0.699 55.76 2.20 P 7 1/2 56 1/2
17.97 0.707 56.45 2.22 P 1/2 7 3/4
18.19 0.716 57.15 2.25 Q 8 57 3/4
18.35 0.722 57.65 2.27 Q 1/2 8 1/4
18.53 0.729 58.21 2.29 Q 3/4 8 1/2
18.61 0.733 58.47 2.30 R 8 5/8 59
18.69 0.736 58.72 2.31 R 1/4 8 3/4
18.80 0.740 59.06 2.32 R 1/2 8 7/8
18.89 0.748 59.34 2.35 R 3/4 9
19.10 0.752 60.00 2.36 S 9 1/8 60 1/4
19.22 0.757 60.38 2.38 S 1/4 9 1/4
19.31 0.760 60.66 2.39 S 1/2 9 3/8
19.41 0.764 60.98 2.40 S 3/4 9 1/2
19.51 0.768 61.29 2.41 T 9 5/8 61 1/2
19.62 0.772 61.64 2.43 T 1/4 9 3/4
19.84 0.781 62.33 2.45 T 1/2 10
20.02 0.788 62.89 2.48 U 10 1/4 62 3/4
20.20 0.797 63.46 2.50 U 1/2 10 1/2
20.32 0.800 63.84 2.51 V 10 5/8 63
20.44 0.805 64.21 2.53 V 1/4 10 3/4
20.68 0.814 64.97 2.56 V 1/2 11
20.76 0.817 65.22 2.57 W 11 1/8 65
20.85 0.821 65.50 2.58 W 1/4 11 1/4
20.94 0.824 65.78 2.59 W 1/2 11 3/8
21.08 0.830 66.22 2.61 W 3/4 11 1/2
21.18 0.834 66.54 2.62 X 11 5/8 66 1/4
21.24 0.836 66.73 2.63 X 1/4 11 3/4
21.30 0.839 66.92 2.64 X 1/2 11 7/8
21.49 0.846 67.51 2.66 Y 12 67 1/2
21.69 0.854 68.14 2.68 Y 1/2 12 1/4
21.89 0.862 68.77 2.71 Z 12 1/2 68 3/4
22.10 0.870 69.43 2.73 Z +1/2 12 3/4
22.33 0.879 70.15 2.76 Z+1 13
22.60 0.890 71.00 2.80 Z+1.5 13.5
22.69 0.893 71.28 2.81 Z+2
22.92 0.902 72.00 2.83 Z+2.5
23.06 0.908 72.45 2.85 Z+3
23.24 0.915 73.01 2.87 Z+3.5
23.47 0.924 73.73 2.90 Z+4
23.55 0.927 73.98 2.91 Z+4.5
23.87 0.940 74.99 2.95 Z+5
24.27 0.956 76.25 3.00 Z+6

Use a Ring Sizer

Silicone ring sizers are inexpensive and there are many options online. Make sure you do not pull the sizer too tightly as this will give you the wrong size. The sizer should slide over your knuckle comfortably.

Do Ring Sizing in Secret

When you are trying to keep the ring a surprise for your loved one and you do not know their ring size, take one of their rings and slide it onto your finger. Make a little mark with a pen where the ring goes up to on your finger and measure the circumference. If you know your loved one will not miss their ring for a day or two, you can also simply take it to a local jeweler to have it sized, or measure the inner diameter yourself, then sneakily put the ring back before they notice it is missing.

In Between Sizes when Ring Sizing?

If your measurement is in between sizes, we recommend ordering up. Wide shank rings and ring sets with two or three bands will fit a bit tighter, so we recommend choosing half a size larger than your normal ring size. When buying a ring, consider the band’s design – full eternity and textured bands cannot be resized and will have to be remade.

What if I Order the Wrong Ring Size?

We are confident that our ring size guide will help you select the right ring size. But if it turns out that your ring does not fit perfectly, do not worry! Just send us an email and our friendly customer service team will be happy to arrange a resize or a remake.

If you need any help choosing the right ring size, please contact us through the live chat or send us an email at info@aureliusjewelry.com.

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