Ashkenazic Shared DNA Survey - August 2022 Update

Thank you to everyone who has contributed data about shared DNA in people with Ashkenazic ancestry!  I have 6455 data points to analyze, and that should help the entire genetic genealogy community  (I'm still collecting data--you can find out more about the project and how to contribute here).

This iteration looks at how shared DNA will differ depending on how much (documented) Ashkenazi DNA each individual has.
There are four tables below:

• Table 1 looks at all 6455 data points, regardless of Ashkenazic percentage
• Table 2 looks at those data points where both individuals are documented to be 100% Ashkenazic
• Table 3 looks at those data points where one individual is documented to be 100% Ashkenazic and the other 50% Ashkenazic
• Table 4 looks at those data points where both individuals are documented to be 50% Ashkenazic 
• Table 5 looks at those data points where one individual is documented to be 100% Ashkenazic and the other 25% Ashkenazic
• Table 6 looks at those data points where one individual is documented to be 50% Ashkenazic and the other 25% Ashkenazic

While I do have data for lower Ashkenazic percentages, at this point, I have so few data points that there isn't enough information to draw any conclusions.  (You can see how few data points I have for the 50%/25% comparison below.)

Table 1:  All responses (regardless of Ashkenazic percentage; 6455 data points) 

Relationship	Number of submissions	Min total shared cM	Max total shared cM	Average total shared cM	Min largest segment	Max largest segment	Average largest segment
Parent/Child	246	3377	3730	3508.86	31	287	270.44
Siblings	245	2206	3866	2655.64	19.2	284.3	184.73
Half Siblings	36	1286	2167	1836.71	79.4	253.7	146.83
Grandparent/Grandchild	41	1368	2312	1849.89	92.4	263.7	178.14
Great Grandparent/Great Grandchild	9	618	1091	843.32	67	135	98.72
Great-great Grandparent/Great-great Grandchild	1	511	511	511	88	88	88
Uncle or Aunt / Niece or Nephew	285	671	2303	1785.19	35	268.8	125.79
Half Uncle or Half Aunt / Half Niece or Half Nephew	26	638.1	1985	1000.86	64.8	161.5	111.8
Great-Aunt or Great-Uncle / Great-Niece or Great-Nephew	52	42	2034.6	866.44	27	237.6	90.04
Half Great-Aunt or Half Great-Uncle / Half Great-Niece or Half Great-Nephew	10	153.9	830	447.95	37.6	134.7	68.24
Great-Great-Aunt or Great-Great-Uncle / Great-Great-Niece or Great-Great-Nephew	6	620.3	1019.5	855.52	52.1	107	74.83
First cousins	471	54	1610	922.24	18	221	84.22
First cousins once removed	693	7	1878	485.14	15	157	60.79
First cousins twice removed	129	0	537	248.93	0	108	44.96
First cousins three times removed	26	51.9	302.8	135.07	17	72.1	34.7
Half first cousins	19	192	852.6	531.92	24	150.7	75.79
Half first cousins once removed	44	63.7	500.1	269.54	23	114.6	53.36
Half first cousins twice removed	5	82.2	212	156.84	36	75.5	59.97
Half first cousins three times removed	2	34.7	54.8	44.75	9.2	10.4	9.8
Second cousins	1081	6.8	698	272.04	6	423	48.62
Second cousins once removed	1007	0	446	163.5	0	122	36.63
Second cousins twice removed	161	0	285.7	107.57	0	88.3	29.63
Second cousins three times removed	27	0	177	85.02	0	32	19.77
Half second cousins	95	30	407.5	155.76	11.8	112.8	39.17
Half second cousins once removed	112	0	243	86.87	0	63	23.98
Half second cousins twice removed	17	0	131.6	46.94	0	35.1	17.41
Half second cousins three times removed	4	30.5	47.9	39.2	12.3	22.8	17.55
Third cousins	529	0	361	113.1	0	91	27.77
Third cousins once removed	419	0	215	76.88	0	68	21.39
Third cousins twice removed	52	0	173	63.09	0	43.89	16.57
Third cousins three times removed	1	46	46	46	0	0	0
Half third cousins	70	0	101.9	30.04	0	32.1	9.37
Half third cousins once removed	21	0	79.3	17.65	0	18.8	5.07
Half third cousins twice removed	1	108	108	108	10	10	10
Fourth cousins	260	0	664	52.76	0	55.6	13.31
Fourth cousins once removed	116	0	148	38.83	0	41.5	10.61
Fourth cousins twice removed	8	0	102.4	59.34	0	31.2	11.03
Half fourth cousins	37	0	194	42.91	0	67.9	16.17
Half fourth cousins once removed	6	0	62.1	33.42	0	62.1	21.48
Half fourth cousins twice removed	1	109	109	109	6	6	6
Fifth cousins	39	0	169	47.55	0	33	8.97
Fifth cousins once removed	30	0	143.8	42.34	0	38.9	9.47
Sixth cousins	5	0	109.5	47.82	0	28	11.16
Sixth cousins once removed	7	0	113.8	74.83	0	32	18.34
Half sixth cousins	2	75	114	94.5	5	5	5
Sixth cousins twice removed	1	25.6	25.6	25.6	9.1	9.1	9.1

Table 2: Both testers with known 100% Ashkenazi ancestry (4416 data points)

Relationship	Number of submissions	Min total shared cM	Max total shared cM	Average total shared cM	Min largest segment	Max largest segment	Average largest segment
Parent/Child	167	3461	3730	3504.55	203.4	284.3	269.94
Siblings	202	2206	3037	2661.59	19.2	281.5	184
Half Siblings	11	1699	2167	1957.92	99.27	253.7	148.65
Grandparent/Grandchild	20	1426	2215.1	1825.46	114.5	237.6	175.82
Great Grandparent/Great Grandchild	1	673.9	673.9	673.9	91.5	91.5	91.5
Great-great Grandparent/Great-great Grandchild	0	-	-	-	-	-	-
Uncle or Aunt / Niece or Nephew	217	671	2303	1791.95	35	223.7	122.87
Half Uncle or Half Aunt / Half Niece or Half Nephew	6	954.418	1220	1087.33966666667	91.23	130	108.2448
Great-Aunt or Great-Uncle / Great-Niece or Great-Nephew	25	42	2034.6	822.32	27	237.6	88.24
Great-Great-Aunt or Great-Great-Uncle / Great-Great-Niece or Great-Great-Nephew	6	620.3	1019.5	855.52	52.1	107	74.83
First cousins	353	54	1610	926.58	29	167	83.3
First cousins once removed	533	24	1878	495.71	15	143	61.11
First cousins twice removed	67	137.1	439.4	262.4	14	79.1	45.66
First cousins three times removed	4	92	170.1	143.8	20.7	37.8	31.13
Half first cousins	11	192	852.6	529.62	24	150.7	72.35
Half first cousins once removed	38	89.8	500.1	274.65	23	114.6	55.91
Half first cousins twice removed	3	162	212	184.67	74.3	75.5	74.9
Half first cousins three times removed	2	34.7	54.8	44.75	9.2	10.4	9.8
Second cousins	797	6.8	698	279.9	13	423	48.91
Second cousins once removed	679	0	446	170.6	0	98	35.59
Second cousins twice removed	80	17.6	285.7	119.91	9.9	88.3	30.75
Second cousins three times removed	18	0	177	95.52	0	30.6	19.51
Half second cousins	68	30	407.5	156.17	11.8	112.8	39.31
Half second cousins once removed	64	8.2	243	95.66	8.2	63	23.68
Half second cousins twice removed	11	0	131.6	49.64	0	33	16.25
Half second cousins three times removed	2	47.9	47.9	47.9	22.8	22.8	22.8
Third cousins	357	0	315	121.17	0	91	27.24
Third cousins once removed	269	0	205	80.31	0	68	19.66
Third cousins twice removed	38	0	173	70.97	0	41.67	16.84
Third cousins three times removed	1	46	46	46	0	0	-
Half third cousins	21	0	101.9	45.75	0	17	10.95
Half third cousins once removed	5	0	79.3	34.58	0	15	8.18
Half third cousins twice removed	1	108	108	108	10	10	10
Fourth cousins	175	0	664	60.87	0	48	14.27
Fourth cousins once removed	80	0	148	44.04	0	38.8	10.73
Fourth cousins twice removed	7	0	102.4	58.57	0	31.2	10.87
Half fourth cousins	2	102	157	129.5	24	42	33
Half fourth cousins once removed	0	-	-	-	-	-	-
Half fourth cousins twice removed	1	109	109	109	6	6	6
Fifth cousins	36	0	169	46.02	0	33	8.58
Fifth cousins once removed	27	0	143.8	44.48	0	38.9	9.44
Sixth cousins	4	0	109.5	43.58	0	28	10.48
Sixth cousins once removed	4	0	113.8	78.45	0	27.8	14.6
Half sixth cousins	2	75	114	94.5	5	5	5
Half Great-Aunt or Half Great-Uncle / Half Great-Niece or Half Great-Nephew	0	-	-	-	-	-	-
Sixth cousins twice removed	1	25.6	25.6	25.6	9.1	9.1	9.1

Table 3: One tester with known 100% Ashkenazi ancestry and one with known 50% Ashkenazi ancestry (1061 data points)

Relationship	Number of submissions	Min total shared cM	Max total shared cM	Average total shared cM	Min largest segment	Max largest segment	Average largest segment
Parent/Child	35	3377	3714	3501.47	263.7	284.3	275.02
Siblings	0	-	-	-	-	-	-
Half Siblings	17	1286	1960.4	1756.16	79.4	198.9	151.17
Grandparent/Grandchild	11	1368	2194.9	1822.25	128	263.7	184.56
Great Grandparent/Great Grandchild	0	-	-	-	-	-	-
Great-great Grandparent/Great-great Grandchild	0	-	-	-	-	-	-
Uncle or Aunt / Niece or Nephew	36	837.1	2155	1713.81	59	268.8	138.29
Half Uncle or Half Aunt / Half Niece or Half Nephew	14	771.7	1985	1008.3	84.5	161.5	112.94
Great-Aunt or Great-Uncle / Great-Niece or Great-Nephew	12	363.3	1141	832.1	49.2	114	88.6
Great-Great-Aunt or Great-Great-Uncle / Great-Great-Niece or Great-Great-Nephew	0	-	-	-	-	-	-
First cousins	59	383	1345	917.56	52	165	83.87
First cousins once removed	106	7	844	442.15	28	157	60.91
First cousins twice removed	26	128.7	451.9	236.98	29	108	48.18
First cousins three times removed	2	96	105	100.5	17	17	17
Half first cousins	1	558	558	558	119	119	119
Half first cousins once removed	0	-	-	-	-	-	-
Half first cousins twice removed	1	148	148	148	36	36	36
Half first cousins three times removed	0	-	-	-	-	-	-
Second cousins	139	69.7	658.1	251.49	15	137.7	51.75
Second cousins once removed	164	19	433.4	145.11	12.8	122	38.36
Second cousins twice removed	40	18	248.7	96.11	8	55.1	29.22
Second cousins three times removed	1	95.5	95.5	95.5	5	5	5
Half second cousins	15	105	313	178.69	28.88	69	48.1
Half second cousins once removed	32	0	164	81.54	0	60.5	26.39
Half second cousins twice removed	6	8.3	78.3	40.2	8.3	35.1	20.33
Half second cousins three times removed	2	30.5	30.5	30.5	12.3	12.3	12.3
Third cousins	97	0	361	102.06	0	76	27.76
Third cousins once removed	69	0	215	73.43	0	67.4	25.37
Third cousins twice removed	9	0	103	40.1	0	28.03	11.9
Third cousins three times removed	0	-	-	-	-	-	-
Half third cousins	32	0	75.2	27.99	0	26	9.81
Half third cousins once removed	11	0	65.1	14.82	0	18.8	4.88
Half third cousins twice removed	0	-	-	-	-	-	-
Fourth cousins	51	0	131	31.28	0	43	9.48
Fourth cousins once removed	31	0	113.1	24.4	0	41.5	9.85
Fourth cousins twice removed	0	-	-	-	-	-	-
Half fourth cousins	30	0	80.1	24.3566666666667	0	67.9	14.22
Half fourth cousins once removed	6	0	62.1	33.4166666666667	0	62.1	21.4833333333333
Half fourth cousins twice removed	0	-	-	-	-	-	-
Fifth cousins	1	50	50	50	9	9	9
Fifth cousins once removed	2	15.7	40	27.85	10	10	10
Sixth cousins	0	-	-	-	-	-	-
Sixth cousins once removed	3	58	87	70	12	32	23.33
Half sixth cousins	0	-	-	-	-	-	-
Half Great-Aunt or Half Great-Uncle / Half Great-Niece or Half Great-Nephew	0	-	-	-	-	-	-
Sixth cousins twice removed	0	-	-	-	-	-	-

Table 4: Both testers with known 50% Ashkenazi ancestry (61 data points)

Relationship	Number of submissions	Min total shared cM	Max total shared cM	Average total shared cM	Min largest segment	Max largest segment	Average largest segment
Parent/Child	3	3445	3480	3464	-	-	-
Siblings	10	2260	2938.1	2631.53	141.2	220.7	186.85
Half Siblings	3	1650.9	1826	1722.8	124.2	184.5	154.8
Grandparent/Grandchild	0	-	-	-	-	-	-
Great Grandparent/Great Grandchild	0	-	-	-	-	-	-
Great-great Grandparent/Great-great Grandchild	0	-	-	-	-	-	-
Uncle or Aunt / Niece or Nephew	3	1674	1882	1744.67	126	126	126
Half Uncle or Half Aunt / Half Niece or Half Nephew	0	-	-	-	-	-	-
Great-Aunt or Great-Uncle / Great-Niece or Great-Nephew	0	-	-	-	-	-	-
Great-Great-Aunt or Great-Great-Uncle / Great-Great-Niece or Great-Great-Nephew	0	-	-	-	-	-	-
First cousins	6	775.9	1069	907.98	57.1	122	99.6
First cousins once removed	2	508.7	539.9	524.3	46.1	77.9	62
First cousins twice removed	0	-	-	-	-	-	-
First cousins three times removed	0	-	-	-	-	-	-
Half first cousins	0	-	-	-	-	-	-
Half first cousins once removed	0	-	-	-	-	-	-
Half first cousins twice removed	0	-	-	-	-	-	-
Half first cousins three times removed	0	-	-	-	-	-	-
Second cousins	7	199	455.3	309.58	43.3	97	65.74
Second cousins once removed	7	44	197.2	137.07	23.6	89.2	55.08
Second cousins twice removed	1	56.1	56.1	56.1	29.4	29.4	29.4
Second cousins three times removed	0	-	-	-	-	-	-
Half second cousins	0	-	-	-	-	-	-
Half second cousins once removed	1	68	68	68	39	39	39
Half second cousins twice removed	0	-	-	-	-	-	-
Half second cousins three times removed	0	-	-	-	-	-	-
Third cousins	1	232	232	232	0	0	0
Third cousins once removed	3	104	113	108.67	26	50	34.33
Third cousins twice removed	1	46.9	46.9	46.9	9.5	9.5	9.5
Third cousins three times removed	0	-	-	-	-	-	-
Half third cousins	1	57	57	57	12	12	12
Half third cousins once removed	0	-	-	-	-	-	-
Half third cousins twice removed	0	-	-	-	-	-	-
Fourth cousins	12	0	115.9	32.93	0	35.9	10.99
Fourth cousins once removed	0	-	-	-	-	-	-
Fourth cousins twice removed	0	-	-	-	-	-	-
Half fourth cousins	0	-	-	-	-	-	-
Half fourth cousins once removed	0	-	-	-	-	-	-
Half fourth cousins twice removed	0	-	-	-	-	-	-
Fifth cousins	0	-	-	-	-	-	-
Fifth cousins once removed	0	-	-	-	-	-	-
Sixth cousins	0	-	-	-	-	-	-
Sixth cousins once removed	0	-	-	-	-	-	-
Half sixth cousins	0	-	-	-	-	-	-
Half Great-Aunt or Half Great-Uncle / Half Great-Niece or Half Great-Nephew	0	-	-	-	-	-	-
Sixth cousins twice removed	0	-	-	-	-	-	-

Table 5: One tester with known 100% Ashkenazi ancestry and one with known 25% Ashkenazi ancestry (196 data points)

Relationship	Number of submissions	Min total shared cM	Max total shared cM	Average total shared cM	Min largest segment	Max largest segment	Average largest segment
Parent/Child	-	-	-	-	-	-	-
Siblings	-	-	-	-	-	-	-
Half Siblings	-	-	-	-	-	-	-
Grandparent/Grandchild	2	1891	1913	1902	187	187	187
Great Grandparent/Great Grandchild	2	1000	1091	1045.5	68	135	101.5
Great-great Grandparent/Great-great Grandchild	0	-	-	-	-	-	-
Uncle or Aunt / Niece or Nephew	0	-	-	-	-	-	-
Half Uncle or Half Aunt / Half Niece or Half Nephew	0	-	-	-	-	-	-
Great-Aunt or Great-Uncle / Great-Niece or Great-Nephew	2	728	918	823	69	76	72.5
Great-Great-Aunt or Great-Great-Uncle / Great-Great-Niece or Great-Great-Nephew	0	-	-	-	-	-	-
First cousins	0	-	-	-	-	-	-
First cousins once removed	8	388	640	503.17	43	96.267	68.4
First cousins twice removed	3	171.326	250.807	214.711	22	42.045	30.644
First cousins three times removed	2	81	148	114.5	20	52	36
Half first cousins	6	465	647	541.6	65	85.3	72.8333333333333
Half first cousins once removed	5	63.7	334.2	233.2	25.6	50.9	38.6
Half first cousins twice removed	1	82.2	82.2	82.2	54.1	54.1	54.1
Half first cousins three times removed	0	-	-	-	-	-	-
Second cousins	19	79.6	497	246.14	20.2	90	45.97
Second cousins once removed	53	0	409.5	177.21	0	119.19	41.03
Second cousins twice removed	7	10	175	115.76	10	51	24.91
Second cousins three times removed	1	16	16	16	0	0	0
Half second cousins	11	77	157.2	124.481818181818	17	55	32.0727272727273
Half second cousins once removed	10	0	109.6	43.06	0	33.8	15.44
Half second cousins twice removed	0	-	-	-	-	-	-
Half second cousins three times removed	0	-	-	-	-	-	-
Third cousins	14	18.3	298.5	102.81	18	81.1	38.15
Third cousins once removed	12	0	153.1	67.89	0	59.8	24.23
Third cousins twice removed	1	19	19	19	0	0	0
Third cousins three times removed	0	-	-	-	-	-	-
Half third cousins	16	0	50.8	11.83	0	32.1	6.25
Half third cousins once removed	5	0	34.8	6.96	0	11.8	2.36
Half third cousins twice removed	0	-	-	-	-	-	-
Fourth cousins	7	0	86.3	28.79	0	28.8	10.92
Fourth cousins once removed	2	0	0	0	0	0	0
Fourth cousins twice removed	0	-	-	-	-	-	-
Half fourth cousins	3	75.9	188	124.966666666667	41.1	41.1	41.1
Half fourth cousins once removed	0	-	-	-	-	-	-
Half fourth cousins twice removed	0	-	-	-	-	-	-
Fifth cousins	1	47	47	47	22.5	22.5	22.5
Fifth cousins once removed	1	15.7	15.7	15.7	0	0	-
Sixth cousins	1	64.8	64.8	64.8	13.9	13.9	13.9
Sixth cousins once removed	0	-	-	-	-	-	-
Half sixth cousins	0	-	-	-	-	-	-
Half Great-Aunt or Half Great-Uncle / Half Great-Niece or Half Great-Nephew	0	-	-	-	-	-	-
Sixth cousins twice removed	0	-	-	-	-	-	-

Table 6: One tester with known 50% Ashkenazi ancestry and one with known 25% Ashkenazi ancestry (42 data points)

Relationship	Number of submissions	Min total shared cM	Max total shared cM	Average total shared cM	Min largest segment	Max largest segment	Average largest segment
Parent/Child	5	3461	3586	3549.48	281	284.3	281.95
Siblings	0	-	-	-	-	-	-
Half Siblings	0	-	-	-	-	-	-
Grandparent/Grandchild	0	-	-	-	-	-	-
Great Grandparent/Great Grandchild	0	-	-	-	-	-	-
Great-great Grandparent/Great-great Grandchild	0	-	-	-	-	-	-
Uncle or Aunt / Niece or Nephew	5	1438	1789.3	1682.62	106	160.87	132.15
Half Uncle or Half Aunt / Half Niece or Half Nephew	4	704	1101	856.775	107.3	155.7	128.866666666667
Great-Aunt or Great-Uncle / Great-Niece or Great-Nephew	0	-	-	-	-	-	-
Great-Great-Aunt or Great-Great-Uncle / Great-Great-Niece or Great-Great-Nephew	0	-	-	-	-	-	-
First cousins	1	1000	1000	1000	0	0	-
First cousins once removed	8	309.7	682	467.69	36	83.8	60.53
First cousins twice removed	0	-	-	-	-	-	-
First cousins three times removed	0	-	-	-	-	-	-
Half first cousins	0	-	-	-	-	-	-
Half first cousins once removed	0	-	-	-	-	-	-
Half first cousins twice removed	0	-	-	-	-	-	-
Half first cousins three times removed	0	-	-	-	-	-	-
Second cousins	6	248	483	314.67	40	113	70.33
Second cousins once removed	3	96	192	151.67	12	35	25.33
Second cousins twice removed	1	53	53	53	27.3	27.3	27.3
Second cousins three times removed	0	-	-	-	-	-	-
Half second cousins	0	-	-	-	-	-	-
Half second cousins once removed	0	-	-	-	-	-	-
Half second cousins twice removed	0	-	-	-	-	-	-
Half second cousins three times removed	0	-	-	-	-	-	-
Third cousins	4	37.2	291	110.025	12.7	23	17.85
Third cousins once removed	1	52.8	52.8	52.8	28.2	28.2	28.2
Third cousins twice removed	0	-	-	-	-	-	-
Third cousins three times removed	0	-	-	-	-	-	-
Half third cousins	0	-	-	-	-	-	-
Half third cousins once removed	0	-	-	-	-	-	-
Half third cousins twice removed	0	-	-	-	-	-	-
Fourth cousins	4	15.8	47.7	24.88	13.6	16.3	15.33
Fourth cousins once removed	0	-	-	-	-	-	-
Fourth cousins twice removed	0	-	-	-	-	-	-
Half fourth cousins	0	-	-	-	-	-	-
Half fourth cousins once removed	0	-	-	-	-	-	-
Half fourth cousins twice removed	0	-	-	-	-	-	-
Fifth cousins	0	-	-	-	-	-	-
Fifth cousins once removed	0	-	-	-	-	-	-
Sixth cousins	0	-	-	-	-	-	-
Sixth cousins once removed	0	-	-	-	-	-	-
Half sixth cousins	0	-	-	-	-	-	-
Half Great-Aunt or Half Great-Uncle / Half Great-Niece or Half Great-Nephew	0	-	-	-	-	-	-
Sixth cousins twice removed	0	-	-	-	-	-	-

Note that some relationships don't have enough data to really do anything statistically.  But as more people enter data, perhaps they will reach that threshold.  Please contribute more data if you haven't already!

And while I have data for people who have other known Ashkenazic ancestral percentages, there really isn't enough data from which anyone can draw conclusions, which is why I stopped where I did.

Remember, you can still contribute information about your own family's shared DNA to the project. Information on this project and how to participate is here.  Particular if you (or a known relative) has partial Ashkenazic ancestry, please contribute your data so that future posts can include additional Ashkenazic percentages.

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