Disclaimer:  These charts are a compilation of information from many different sources.  The reliability of the information may be questionable, but should give you some idea regarding requirements.

Circles: 11-20 | 21-30 | 31-40 | 41-50 | 51-60

Circles	1	2	3	4	5	6	7	8	9	10
Magic Total	15	35	50	70	85	105	120	140	155	175
Lore	7.5	15	22.5	30	37.5	45	52.5	60	67.5	75
Survival	18	36	54	72	90	108	126	144	162	180
Primary Magic	5	10	15	20	25	30	35	40	45	50
Harness	5	10	15	20	25	30	35	40	45	50
Power Perception	3	6	9	12	15	18	21	24	27	30
Magical Devices	2	4	6	8	10	12	14	16	18	20
Scholarship	3	6	9	12	15	18	21	24	27	30
Teaching	1	2	3	4	5	6	7	8	9	10
Mech Lore	2	4	6	8	10	12	14	16	18	20
Perception	3	6	9	12	15	18	21	24	27	30
Foraging	2	4	6	8	10	12	14	16	18	20
Swimming	2	4	6	8	10	12	14	16	18	20
Climbing	2	4	6	8	10	12	14	16	18	20
First Aid*	2	4	6	8	10	12	14	16	18	20
* You only need 1 to 1.5 ranks of First Aid to circle, but I've estimated to 2 ranks.

Circles 11 - 20

Circle	11	12	13	14	15	16	17	18	19	20
Magic (Total)	195	220	240	265	285	310	330	355	375	400
Lore	82.5	90	97.5	105	112.5	120	127.5	135	142.5	150
Survival	198	216	234	252	270	288	306	324	342	360
PM	55	60	65	70	75	80	85	90	95	100
Harness	54	58	62	66	70	74	78	82	86	90
Power Perception	31	32	33	34	35	36	37	38	39	40
Mech lore	22	24	26	28	30	32	34	36	38	40
Perception	31	32	33	34	35	36	37	38	39	40
Teaching	13	16	19	22	25	28	31	34	37	40

Circles 21 - 30

Circle	21	22	23	24	25	26	27	28	29	30
Magic (Total)	420	445	465	490	510	535	555	580	600	625
Lore	157.5	165	172.5	180	187.5	195	202.5	210	217.5	225
Survival	381	402	423	444	465	486	507	528	549	570
PM	105	110	115	120	125	130	135	140	145	150
Harness	94	98	102	106	110	114	118	122	126	130
Mech lore	42	44	46	48	50	52	54	56	58	60
Perception	41	42	43	44	45	46	47	48	49	50
Teaching	43	46	49	52	55	58	61	64	67	70

Circles 31 - 40

Circle	31	32	33	34	35	36	37	38	39	40
Magic (Total)	650	680	705	735	760	790	815	845	870	900
Lore	240	255	270	285	300	315	330	345	360	375
Survival	596	622	648	674	700	726	752	778	804	830
PM	155	160	165	170	175	180	185	190	195	200
Harness	135	140	145	150	155	160	165	170	175	180
Teaching	73	76	79	82	85	88	91	94	97	100

Circles 41 - 50

Circle	41	42	43	44	45	46	47	48	49	50
Magic (Total)	925	955	980	1005	1035	1060	1090	1115	1145	1170
Lore	390	405	420	435	450	465	480	495	510	525
Survival	856	882	908	934	960	986	1012	1038	1064	1090
PM	205	210	215	220	225	230	235	240	245	250
Harness	185	190	195	200	205	210	215	220	225	230
Teaching	103	106	109	112	115	118	121	124	127	130

Circles 51 - 60

Circle	51	52	53	54	55	56	57	58	59	60
Magic (Total)	1200	1225	1255	1280	1310	1335	1365	1390	1420	1445
Lore	540	555	570	585	600	615	630	645	660	675
Survival	1116	1145	1168	1194	1220	1246	1272	1298	1324	1350
PM	255	260	265	270	275	280	285	290	295	300
Harness	235	240	245	250	255	260	265	270	275	280
Teaching	133	136	139	142	145	148	151	154	157	160