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	–	Mississippi State	383	SEC
2	↑ 7	Texas	357	SEC
3	↑ 7	Florida	350	SEC
4	↑ 3	UCLA	347	Big Ten
5	↓ 3	Miami	346	ACC
6	↓ 2	Notre Dame	343	FBS Independents
7	↓ 1	Alabama	339	SEC
8	↑ 9	Iowa	336	Big Ten
9	↑ 4	Virginia Tech	330	ACC
10	↓ 7	Duke	314	ACC
11	↑ 7	Cincinnati	308	Big 12
12	↑ 7	Georgia	300	SEC
13	↑ 11	Utah	298	Big 12
14	↓ 6	Pittsburgh	294	ACC
15	↑ 13	Clemson	282	ACC
16	↑ 13	Nebraska	279	Big Ten
17	↑ 13	Indiana	278	Big Ten
18	↑ 20	Oklahoma State	272	Big 12
19	↓ 4	BYU	271	Big 12
20	↑ 1	Texas Tech	270	Big 12
21	↑ 14	Wake Forest	263	ACC
22	↑ 11	LSU	251	SEC
23	↑ 28	Oregon	250	Big Ten
24	↓ 20	Ole Miss	249	SEC
25	↑ 18	Auburn	247	SEC
26	↑ 27	Wisconsin	242	Big Ten
27	↑ 5	Kentucky	238	SEC
28	↑ 12	Ohio State	231	Big Ten
29	↑ 28	Minnesota	228	Big Ten
30	↑ 18	UCF	224	Big 12
31	↑ 19	Baylor	221	Big 12
31	↓ 17	Missouri	221	SEC
33	↑ 3	SMU	219	ACC
34	↑ 11	Virginia	215	ACC
35	↓ 24	Michigan	214	Big Ten
35	↓ 24	USC	214	Big Ten
37	↓ 15	Vanderbilt	205	SEC
38	↓ 13	Northwestern	202	Big Ten
38	↓ 22	West Virginia	202	Big 12
40	↓ 20	Penn State	193	Big Ten
41	↑ 4	North Carolina	192	ACC
42	↓ 19	Tennessee	191	SEC
43	↑ 4	Arizona State	190	Big 12
43	↑ 13	Houston	190	Big 12
45	↓ 19	Kansas State	188	Big 12
46	↑ 13	Arizona	187	Big 12
47	↓ 20	Washington	175	Big Ten
48	↑ 14	Massachusetts	172	Mid-American
49	↓ 15	Colorado	168	Big 12
50	↓ 19	Louisville	164	ACC
50	↓ 14	Oklahoma	164	SEC
52	↑ 9	North Dakota State	161	Mountain West
53	↑ 10	South Florida	160	American Athletic
54	↑ 11	James Madison	159	Sun Belt
55	↑ 12	Stanford	158	ACC
55	↓ 15	Texas A&M	158	SEC
57	↑ 14	NC State	157	ACC
58	↑ 15	Arkansas	156	SEC
59	↓ 20	California	150	ACC
60	↓ 20	Boston College	148	ACC
60	↑ 6	Fresno State	148	Pac-12
62	↑ 16	Boise State	146	Pac-12
62	↓ 13	Tulsa	146	American Athletic
64	↓ 20	Michigan State	145	Big Ten
65	↑ 5	Florida Atlantic	143	American Athletic
66	↓ 15	TCU	142	Big 12
67	–	Marshall	134	Sun Belt
67	↓ 9	South Carolina	134	SEC
69	–	Florida State	133	ACC
69	↓ 10	Illinois	133	Big Ten
71	↓ 17	Maryland	131	Big Ten
72	↓ 17	Iowa State	130	Big 12
73	↑ 13	UTSA	125	American Athletic
74	↑ 12	New Mexico	124	Mountain West
75	↑ 6	Georgia State	122	Sun Belt
75	↑ 8	Louisiana	122	Sun Belt
77	↓ 4	Kansas	120	Big 12
77	↓ 4	Memphis	120	American Athletic
77	↓ 4	Syracuse	120	ACC
80	↑ 11	Liberty	117	Conference USA
80	↑ 9	Toledo	117	Mid-American
82	↓ 19	App State	116	Sun Belt
83	↑ 10	Tulane	107	American Athletic
84	↑ 19	Jacksonville State	105	Conference USA
85	↑ 16	UNLV	104	Mountain West
86	↑ 15	UAB	103	American Athletic
87	↑ 21	Miami (OH)	101	Mid-American
88	↑ 27	Air Force	95	Mountain West
88	↓ 11	UConn	95	FBS Independents
90	↓ 12	Georgia Tech	94	ACC
90	↓ 18	Purdue	94	Big Ten
92	↑ 23	Army	92	American Athletic
92	↑ 16	Kent State	92	Mid-American
92	↑ 2	San José State	92	Mountain West
95	↓ 15	Delaware	91	Conference USA
95	↑ 22	Oregon State	91	Pac-12
97	↓ 2	Rutgers	90	Big Ten
98	↓ 1	East Carolina	88	American Athletic
98	↓ 1	Texas State	88	Pac-12
100	–	North Texas	87	American Athletic
100	↓ 17	South Alabama	87	Sun Belt
102	↓ 17	Middle Tennessee	86	Conference USA
103	↓ 17	Troy	85	Sun Belt
104	↑ 15	Arkansas State	83	Sun Belt
104	↓ 15	Central Michigan	83	Mid-American
104	↓ 1	Ohio	83	Mid-American
107	↓ 1	Florida International	82	Conference USA
107	↓ 26	Western Michigan	82	Mid-American
107	↑ 24	Wyoming	82	Mountain West
110	↑ 23	Utah State	79	Pac-12
111	↓ 19	Colorado State	78	Pac-12
112	↓ 4	Louisiana Tech	77	Sun Belt
113	↓ 18	Hawai'i	72	Mountain West
114	↑ 5	Buffalo	70	Mid-American
114	↓ 17	Navy	70	American Athletic
116	↑ 7	Eastern Michigan	67	Mid-American
117	↓ 9	Ball State	62	Mid-American
117	↓ 14	Washington State	62	Pac-12
117	↑ 15	Western Kentucky	62	Conference USA
120	↓ 13	Nevada	60	Mountain West
121	↓ 13	Akron	58	Mid-American
121	↓ 13	Georgia Southern	58	Sun Belt
121	↓ 4	Missouri State	58	Conference USA
121	↓ 13	UTEP	58	Mountain West
125	↓ 1	Kennesaw State	53	Conference USA
125	↓ 1	Rice	53	American Athletic
125	↓ 1	Sam Houston	53	Conference USA
125	↓ 1	San Diego State	53	Pac-12
125	↓ 1	Southern Miss	53	Sun Belt
130	↓ 11	Coastal Carolina	52	Sun Belt
130	↓ 11	New Mexico State	52	Conference USA
132	↓ 8	Old Dominion	49	Sun Belt
132	↓ 8	Temple	49	American Athletic
134	↓ 1	Northern Illinois	46	Mountain West
135	↓ 2	Bowling Green	43	Mid-American
136	–	Charlotte	40	American Athletic
137	–	UL Monroe	39	Sun Belt
138	–	Sacramento State	36	Mid-American
139	–	Montana State*	34	Big Sky
140	–	Idaho State*	30	Big Sky
140	–	Tarleton State*	30	UAC
142	–	The Citadel*	28	Southern
143	–	Illinois State*	24	MVFC
144	–	SE Louisiana*	18	Southland

* FCS