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	Georgia	450	SEC
2	–	Miami	417	ACC
3	–	Notre Dame	416	FBS Independents
4	↑ 2	UCLA	410	Big Ten
5	↑ 8	Indiana	377	Big Ten
6	↑ 9	Wake Forest	343	ACC
7	↑ 4	BYU	341	Big 12
8	–	Ohio State	336	Big Ten
9	↑ 7	Missouri	329	SEC
10	↓ 9	Alabama	326	SEC
11	↑ 3	Utah	325	Big 12
12	↑ 7	Kentucky	322	SEC
13	↓ 3	Texas Tech	312	Big 12
14	↑ 5	Oklahoma State	308	Big 12
15	↑ 12	Arizona	290	Big 12
15	↑ 12	Ole Miss	290	SEC
17	↑ 10	USC	288	Big Ten
18	↑ 6	Iowa	287	Big Ten
18	↓ 1	Mississippi State	287	SEC
20	↓ 15	Texas	286	SEC
21	↓ 17	Pittsburgh	283	ACC
22	↑ 13	Houston	282	Big 12
23	↑ 11	Tennessee	271	SEC
23	↓ 2	Wisconsin	271	Big Ten
25	↓ 2	Baylor	269	Big 12
26	↓ 17	Duke	251	ACC
27	↑ 6	Northwestern	250	Big Ten
28	↓ 1	SMU	249	ACC
29	↑ 3	Cincinnati	246	Big 12
30	↑ 24	North Carolina	238	ACC
31	↑ 17	Oklahoma	235	SEC
32	↓ 20	Nebraska	229	Big Ten
33	↓ 12	Minnesota	217	Big Ten
34	↑ 2	Clemson	211	ACC
35	↓ 17	Florida	210	SEC
36	↑ 5	James Madison	204	Sun Belt
37	↑ 14	Boise State	203	Pac-12
38	↓ 13	LSU	201	SEC
38	↑ 7	Virginia	201	ACC
40	↓ 3	Auburn	198	SEC
40	↓ 9	Virginia Tech	198	ACC
42	↓ 16	Oregon	187	Big Ten
43	↑ 27	Purdue	181	Big Ten
44	↑ 2	Michigan	171	Big Ten
45	↑ 47	South Carolina	170	SEC
46	↑ 29	California	169	ACC
46	↑ 18	UNLV	169	Mountain West
48	↑ 19	Louisville	166	ACC
49	↑ 12	UTSA	162	American Athletic
50	↑ 48	Georgia Tech	157	ACC
51	↑ 6	Arizona State	153	Big 12
52	↑ 6	Liberty	151	Conference USA
52	↑ 16	Memphis	151	American Athletic
52	↓ 13	Texas A&M	151	SEC
55	↑ 1	Florida Atlantic	143	American Athletic
55	↓ 13	UCF	143	Big 12
57	↓ 19	NC State	142	ACC
57	↓ 14	North Dakota State	142	Mountain West
59	↓ 15	Florida State	141	ACC
59	↓ 19	Kansas State	141	Big 12
61	↓ 14	Iowa State	136	Big 12
61	↑ 2	New Mexico	136	Mountain West
63	↑ 3	Georgia State	132	Sun Belt
64	↑ 10	North Texas	130	American Athletic
65	↑ 27	Illinois	129	Big Ten
66	↑ 5	Colorado	126	Big 12
67	↑ 20	Ohio	125	Mid-American
67	↑ 13	Oregon State	125	Pac-12
69	↓ 21	Fresno State	123	Pac-12
69	↑ 26	Louisiana Tech	123	Sun Belt
69	↓ 21	Vanderbilt	123	SEC
72	↑ 9	Eastern Michigan	122	Mid-American
73	↑ 10	Air Force	121	Mountain West
73	↓ 22	West Virginia	121	Big 12
75	↑ 2	Boston College	118	ACC
75	↑ 14	Jacksonville State	118	Conference USA
77	↓ 24	Penn State	115	Big Ten
77	↓ 23	Syracuse	115	ACC
79	↑ 13	Western Michigan	114	Mid-American
80	↑ 15	South Alabama	112	Sun Belt
81	↓ 21	Louisiana	111	Sun Belt
82	↓ 20	Kansas	110	Big 12
83	↑ 20	Miami (OH)	108	Mid-American
84	↑ 3	TCU	106	Big 12
85	↓ 27	Washington	105	Big Ten
86	↓ 15	Stanford	101	ACC
87	↓ 22	Toledo	100	Mid-American
88	↓ 19	Massachusetts	97	Mid-American
89	↑ 11	East Carolina	96	American Athletic
89	↓ 14	South Florida	96	American Athletic
89	↑ 12	Troy	96	Sun Belt
92	↑ 12	Army	95	American Athletic
92	↑ 10	Florida International	95	Conference USA
94	↓ 21	Arkansas	94	SEC
94	↑ 20	Wyoming	94	Mountain West
96	↑ 9	UConn	93	FBS Independents
97	↓ 19	App State	87	Sun Belt
97	↓ 19	Michigan State	87	Big Ten
97	↓ 14	Tulsa	87	American Athletic
100	↓ 15	Tulane	86	American Athletic
101	↑ 25	Buffalo	85	Mid-American
102	↓ 13	Maryland	84	Big Ten
103	↓ 22	San José State	82	Mountain West
103	↓ 12	UAB	82	American Athletic
105	↓ 20	Marshall	80	Sun Belt
106	↑ 15	Navy	78	American Athletic
107	↓ 12	Central Michigan	76	Mid-American
108	↑ 3	Bowling Green	75	Mid-American
109	↑ 9	Nevada	72	Mountain West
109	↑ 8	Utah State	72	Pac-12
111	↓ 3	Texas State	70	Pac-12
112	↓ 3	Middle Tennessee	69	Conference USA
113	↓ 2	Delaware	68	Conference USA
113	↑ 21	Old Dominion	68	Sun Belt
115	↓ 2	Rutgers	67	Big Ten
115	↓ 16	Temple	67	American Athletic
117	↑ 17	Coastal Carolina	66	Sun Belt
118	↑ 9	Western Kentucky	62	Conference USA
119	–	Colorado State	58	Pac-12
120	↓ 15	San Diego State	57	Pac-12
121	↓ 12	Kent State	55	Mid-American
122	↓ 17	Georgia Southern	53	Sun Belt
123	↓ 7	New Mexico State	51	Conference USA
124	↓ 10	Arkansas State	49	Sun Belt
125	↓ 6	Missouri State	46	Conference USA
126	↓ 4	Hawai'i	43	Mountain West
127	↓ 4	Sam Houston	42	Conference USA
127	↓ 4	Southern Miss	42	Sun Belt
129	↓ 6	Kennesaw State	40	Conference USA
130	↓ 2	Ball State	37	Mid-American
130	↓ 2	Washington State	37	Pac-12
132	↓ 4	Akron	34	Mid-American
132	↑ 5	Montana State*	34	Big Sky
132	↓ 4	Northern Illinois	34	Mountain West
132	↓ 4	UTEP	34	Mountain West
136	↓ 3	Rice	32	American Athletic
137	↑ 1	UL Monroe	31	Sun Belt
138	↑ 1	Idaho State*	30	Big Sky
138	↑ 1	Tarleton State*	30	UAC
140	↓ 4	Sacramento State	29	Mid-American
141	↑ 1	The Citadel*	28	Southern
142	↓ 3	Charlotte	24	American Athletic
142	↑ 1	Illinois State*	24	MVFC
144	–	SE Louisiana*	18	Southland

* FCS