Ring Size Chart & Free Ring Sizer

The Importance of Ring Size

Supplying the correct ring size to Ralph Jacobs is crucial as we custom-manufactures each order.

If the wrong size is provided, it may not be possible or difficult to resize the ring.
Resizing can alter the appearance and integrity of the ring, and in some cases, resizing may not be feasible.
By providing the correct size, you can ensure that your ring is made to fit perfectly from the start, ensuring its longevity and appearance.

The Risks of Re-Sizing a Ring

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Ring Size Chart

Ralph Jacobs rings are sized in South African measurements.
Use our conversion chart to determine the corresponding finger circumference or to convert to sizes used in other countries

Inside Circumference	Table header 1	US, Canada, Mexico	UK, Australia, Ireland, New Zealand, South Africa	France	Germany, Russia, Ukraine, Asia	India, China, Japan, South America, Turkey, Israel	Italy, Spain, Netherlands, Switzerland
IN	MM
1.74	44.2	3	F	44	14	4	4
1.77	44.8	3.25	F 1/2	44.625	14.25		4.625
1.79	45.5	3.5	G	45.25	14.5	5	5.25
1.82	46.1	3.75	G 1/2	45.875	14.75	6	5.875
1.84	46.8	4	H	46.5	15	7	6.5
1.87	47.4	4.25	H 1/2	47.125	15.25		7.125
1.89	48	4.5	I	47.75	15.5	8	7.75
1.92	48.7	4.75	J	48.375			8.375
1.94	49.3	5	J 1/2	49	15.75	9	9
1.97	50	5.25	K	49.625	16		9.625
1.99	50.60	5.5	K 1/2	50.25	16.25	10	10.25
2.02	51.2	5.75	L	50.875		11	10.875
2.04	51.90	6	L 1/2	51.5	16.5	12	11.50
2.07	52.50	6.25	M	52.125	16.75		12.125
2.09	53.1	6.5	M 1/2	52.75	17	13	12.75
2.12	53.8	6.75	N	53.375			13.375
2.14	54.4	7	N 1/2	54	17.25	14	14
2.17	55.1	7.25	O	54.625	17.5		14.625
2.19	55.7	7.5	O 1/2	55.25	17.75	15	15.25
2.22	56.3	7.75	P	55.875			15.875
2.24	57	8	P 1/2	56.5	18	16	16.5
2.27	57.6	8.25	Q	57.125	18.25		7.125
2.29	58.30	8.5	Q 1/2	57.75	18.5	17	17.75
2.32	58.9	8.75	R	58.375	18.75		18.375
2.34	59.5	9	R 1/2	59	19	18	19
2.37	60.2	9.25	S	59.625	19.25		19.625
2.39	60.8	9.5	S 1/2	60.25	19.5	19	20.25
2.42	61.40	9.75	T	60.875	19.75		20.875
2.44	62.1	10	T 1/2	61.5	20	20	21.25
2.47	62.7	10.25	U	62.125	20.25	21	22.125
2.49	63.4	10.5	U 1/2	62.75	20.5	22	22.75
2.52	64	10.75	V	63.375			23.375
2.54	64.6	11	V 1/2	64	20.75	23	24
2.57	65.3	11.25	W	64.625			24.625
2.59	65.9	11.5	W 1/2	65.25	21	24	25.25
2.62	66.6	11.75	X	65.875			25.875
2.65	67.20	12	X 1/2	66.5	21.25	25	26.5
2.68	68.1	12.25	Y	67.125	21.5		27.125
2.71	68.5	12.5	Z	67.75	21.75	26	27.75
2.72	69.10	12.75	Z 1/2	68.375			28.375
2.75	69.7	13		69	22	27	29

Ring Size Tips

Ensure to measure the correct finger. Your dominant hand is typically slightly larger.
Rings with wider bands tend to fit tighter. For best results, measure a ring with a similar width to the one you plan to purchase if you are measuring for your partner.
Ensure the finger being measured is at a normal body temperature, as fingers may shrink or expand when hot or cold.
It's best to measure your finger at the end of the day as the size of your fingers tend to fluctuate throughout the day.
If your knuckle is larger, take two measurements and select a size that falls in between. The ring should fit comfortably over the knuckle without being too loose, as this can cause it to shift.
For a successful surprise proposal, check out our tips on How to Measure Ring Size.
For a successful surprise proposal, check out our tips on How to Measure Ring Size.

Resize My Ring

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