Every FBS school starts off with 100 marbles, plus 10 bonus marbles for every game on their schedule against a power conference opponent or Notre Dame
Beat your opponent at your home place or neutral site (including conference championships), take 20% of their marbles; beat your opponent at their home place, take 25% of their marbles
Fractional marbles are rounded to nearest whole number. For example, if you beat an opponent with 210 marbles at their place, you would get 25% of their 210, 52.5, which would be rounded up to 53.
If you beat an FCS opponent, you get nothing. If you lose to an FCS opponent, they get 25% of your marbles. Because FU coward.

Rankings

Marble Rank	Trend	Team	Marbles	Conference
1	↑ 6	Alabama	435	SEC
2	↑ 3	Miami	417	ACC
3	↑ 3	Notre Dame	391	FBS Independents
4	↑ 10	Pittsburgh	377	ACC
5	↓ 3	Texas	357	SEC
6	↓ 2	UCLA	347	Big Ten
7	↑ 5	Georgia	341	SEC
8	↑ 20	Ohio State	315	Big Ten
9	↑ 1	Duke	314	ACC
10	↑ 10	Texas Tech	312	Big 12
11	↑ 8	BYU	307	Big 12
12	↑ 4	Nebraska	305	Big Ten
13	↑ 4	Indiana	301	Big Ten
14	↓ 1	Utah	298	Big 12
15	↑ 6	Wake Forest	295	ACC
16	↑ 15	Missouri	291	SEC
17	↓ 16	Mississippi State	287	SEC
18	↓ 15	Florida	280	SEC
19	↑ 8	Kentucky	272	SEC
19	↓ 1	Oklahoma State	272	Big 12
21	↑ 8	Minnesota	271	Big Ten
21	↑ 5	Wisconsin	271	Big Ten
23	↑ 8	Baylor	269	Big 12
24	↓ 16	Iowa	252	Big Ten
25	↓ 3	LSU	251	SEC
26	↓ 3	Oregon	250	Big Ten
27	↑ 19	Arizona	249	Big 12
27	↓ 3	Ole Miss	249	SEC
27	↑ 6	SMU	249	ACC
27	↑ 8	USC	249	Big Ten
31	↓ 22	Virginia Tech	247	ACC
32	↓ 21	Cincinnati	246	Big 12
33	↑ 5	Northwestern	241	Big Ten
34	↑ 8	Tennessee	240	SEC
35	↑ 8	Houston	235	Big 12
36	↓ 21	Clemson	211	ACC
37	↓ 12	Auburn	198	SEC
38	↑ 19	NC State	190	ACC
39	↑ 16	Texas A&M	189	SEC
40	↑ 5	Kansas State	188	Big 12
41	↑ 13	James Madison	186	Sun Belt
42	↓ 12	UCF	179	Big 12
43	↑ 9	North Dakota State	177	Mountain West
44	↑ 25	Florida State	176	ACC
45	↓ 11	Virginia	172	ACC
46	↓ 11	Michigan	171	Big Ten
47	↑ 25	Iowa State	170	Big 12
48	↑ 12	Fresno State	164	Pac-12
48	↑ 2	Oklahoma	164	SEC
48	↓ 11	Vanderbilt	164	SEC
51	↑ 11	Boise State	162	Pac-12
51	↓ 13	West Virginia	162	Big 12
53	↓ 13	Penn State	154	Big Ten
54	↓ 13	North Carolina	144	ACC
54	↑ 23	Syracuse	144	ACC
56	↑ 9	Florida Atlantic	143	American Athletic
57	↓ 14	Arizona State	142	Big 12
58	↑ 22	Liberty	140	Conference USA
58	↓ 11	Washington	140	Big Ten
60	↑ 15	Louisiana	139	Sun Belt
61	↑ 12	UTSA	138	American Athletic
62	↑ 15	Kansas	137	Big 12
63	↑ 11	New Mexico	136	Mountain West
64	↑ 21	UNLV	134	Mountain West
65	↑ 15	Toledo	133	Mid-American
66	↑ 9	Georgia State	132	Sun Belt
67	↓ 17	Louisville	131	ACC
68	↑ 9	Memphis	130	American Athletic
69	↓ 21	Massachusetts	129	Mid-American
70	↑ 20	Purdue	127	Big Ten
71	↓ 22	Colorado	126	Big 12
71	↓ 16	Stanford	126	ACC
73	↓ 15	Arkansas	125	SEC
74	↑ 26	North Texas	124	American Athletic
75	↓ 16	California	120	ACC
75	↓ 22	South Florida	120	American Athletic
77	↓ 17	Boston College	118	ACC
78	↑ 4	App State	116	Sun Belt
78	↓ 14	Michigan State	116	Big Ten
80	↑ 15	Oregon State	111	Pac-12
81	↑ 35	Eastern Michigan	110	Mid-American
81	↑ 11	San José State	110	Mountain West
83	↑ 5	Air Force	109	Mountain West
83	↓ 21	Tulsa	109	American Athletic
85	↓ 18	Marshall	107	Sun Belt
85	↓ 2	Tulane	107	American Athletic
87	↑ 17	Ohio	106	Mid-American
87	↓ 21	TCU	106	Big 12
89	↓ 5	Jacksonville State	105	Conference USA
89	↓ 18	Maryland	105	Big Ten
91	↓ 5	UAB	103	American Athletic
92	↓ 23	Illinois	100	Big Ten
92	↓ 25	South Carolina	100	SEC
92	↑ 15	Western Michigan	100	Mid-American
95	↑ 9	Central Michigan	95	Mid-American
95	↑ 17	Louisiana Tech	95	Sun Belt
95	↑ 5	South Alabama	95	Sun Belt
98	↓ 8	Georgia Tech	94	ACC
99	↑ 33	Temple	89	American Athletic
100	↓ 2	East Carolina	88	American Athletic
101	↑ 2	Troy	85	Sun Belt
102	↑ 5	Florida International	82	Conference USA
103	↓ 16	Miami (OH)	76	Mid-American
104	↓ 12	Army	74	American Athletic
105	↑ 16	Georgia Southern	71	Sun Belt
105	↑ 20	San Diego State	71	Pac-12
105	↓ 17	UConn	71	FBS Independents
108	↓ 10	Texas State	70	Pac-12
109	↓ 17	Kent State	69	Mid-American
109	↓ 7	Middle Tennessee	69	Conference USA
111	↑ 24	Bowling Green	68	Mid-American
111	↓ 16	Delaware	68	Conference USA
113	↓ 16	Rutgers	67	Big Ten
114	↓ 10	Arkansas State	66	Sun Belt
114	↓ 7	Wyoming	66	Mountain West
116	↑ 14	New Mexico State	64	Conference USA
117	↓ 7	Utah State	63	Pac-12
118	↑ 2	Nevada	60	Mountain West
119	↓ 8	Colorado State	58	Pac-12
119	↑ 2	Missouri State	58	Conference USA
121	↓ 7	Navy	56	American Athletic
122	↓ 9	Hawai'i	54	Mountain West
123	↑ 2	Kennesaw State	53	Conference USA
123	↑ 2	Sam Houston	53	Conference USA
123	↑ 2	Southern Miss	53	Sun Belt
126	↓ 12	Buffalo	52	Mid-American
127	↓ 10	Western Kentucky	50	Conference USA
128	↓ 7	Akron	46	Mid-American
128	↓ 11	Ball State	46	Mid-American
128	↑ 6	Northern Illinois	46	Mountain West
128	↓ 7	UTEP	46	Mountain West
128	↓ 11	Washington State	46	Pac-12
133	↓ 8	Rice	40	American Athletic
134	↓ 4	Coastal Carolina	39	Sun Belt
134	↓ 2	Old Dominion	39	Sun Belt
136	↑ 2	Sacramento State	36	Mid-American
137	↑ 2	Montana State*	34	Big Sky
138	↓ 1	UL Monroe	31	Sun Belt
139	↓ 3	Charlotte	30	American Athletic
139	↑ 1	Idaho State*	30	Big Sky
139	↑ 1	Tarleton State*	30	UAC
142	–	The Citadel*	28	Southern
143	–	Illinois State*	24	MVFC
144	–	SE Louisiana*	18	Southland

* FCS