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	–	Colorado	263	Big 12
2	↑ 4	Miami	256	ACC
2	↑ 4	SMU	256	ACC
4	↑ 2	UCLA	250	Big Ten
5	↑ 1	Cincinnati	242	Big 12
5	↑ 1	Ole Miss	242	SEC
7	↓ 1	Auburn	240	SEC
7	↓ 1	LSU	240	SEC
7	↓ 1	North Carolina	240	ACC
7	↓ 1	Notre Dame	240	FBS Independents
7	↓ 1	Virginia	240	ACC
12	↑ 48	USC	234	Big Ten
13	↓ 7	Duke	224	ACC
13	↓ 7	Iowa	224	Big Ten
13	↓ 7	Ohio State	224	Big Ten
13	↓ 7	Oklahoma	224	SEC
13	↓ 7	Pittsburgh	224	ACC
13	↓ 7	South Carolina	224	SEC
13	↓ 7	Texas A&M	224	SEC
13	↓ 7	Wake Forest	224	ACC
21	↓ 15	Alabama	222	SEC
21	↓ 15	Florida	222	SEC
21	↓ 15	Illinois	222	Big Ten
21	↓ 15	Michigan	222	Big Ten
21	↓ 15	Michigan State	222	Big Ten
21	↓ 15	Mississippi State	222	SEC
21	↓ 15	Oregon	222	Big Ten
21	↓ 15	Texas	222	SEC
21	↓ 15	West Virginia	222	Big 12
30	↑ 30	Washington	216	Big Ten
31	↑ 29	Houston	214	Big 12
32	↑ 28	Indiana	212	Big Ten
32	↑ 28	Nebraska	212	Big Ten
32	↑ 28	Penn State	212	Big Ten
35	↓ 34	Purdue	210	Big Ten
36	↓ 30	Arizona State	200	Big 12
36	↓ 30	Arkansas	200	SEC
36	↓ 30	BYU	200	Big 12
36	↓ 30	Georgia	200	SEC
36	↓ 30	Iowa State	200	Big 12
36	↓ 30	Kansas	200	Big 12
36	↓ 30	Kentucky	200	SEC
36	↓ 30	Maryland	200	Big Ten
36	↓ 30	Minnesota	200	Big Ten
36	↓ 30	Missouri	200	SEC
36	↓ 30	Northwestern	200	Big Ten
36	↓ 30	Syracuse	200	ACC
36	↓ 30	Tennessee	200	SEC
36	↓ 30	UCF	200	Big 12
36	↓ 30	Utah	200	Big 12
36	↓ 30	Vanderbilt	200	SEC
36	↓ 30	Virginia Tech	200	ACC
53	↑ 7	Arizona	190	Big 12
53	↑ 7	Kansas State	190	Big 12
53	↑ 7	Texas Tech	190	Big 12
56	↓ 55	Boston College	168	ACC
56	↓ 55	Louisville	168	ACC
56	↓ 50	Stanford	168	ACC
59	↓ 53	Florida State	166	ACC
60	↓ 54	Baylor	160	Big 12
60	↓ 54	Clemson	160	ACC
60	↑ 29	Massachusetts	160	Mid-American
60	↓ 54	NC State	160	ACC
60	↓ 54	Oklahoma State	160	Big 12
60	↓ 54	TCU	160	Big 12
60	↑ 11	Tulsa	160	American Athletic
60	↓ 54	Wisconsin	160	Big Ten
68	↓ 67	Georgia Tech	157	ACC
69	↓ 63	California	150	ACC
69	↑ 59	Memphis	150	American Athletic
69	↓ 63	Rutgers	150	Big Ten
72	↑ 17	Nevada	134	Mountain West
73	↑ 16	New Mexico	132	Mountain West
73	↑ 16	Troy	132	Sun Belt
75	↑ 14	Colorado State	130	Pac-12
75	↓ 6	UConn	130	FBS Independents
77	↑ 12	San José State	123	Mountain West
78	↓ 7	Delaware	120	Conference USA
78	↓ 7	Georgia Southern	120	Sun Belt
78	↑ 50	James Madison	120	Sun Belt
78	↓ 7	Louisiana Tech	120	Sun Belt
78	↑ 50	North Dakota State	120	Mountain West
78	↑ 50	South Florida	120	American Athletic
84	↑ 5	App State	110	Sun Belt
84	↑ 5	Buffalo	110	Mid-American
84	↑ 5	Georgia State	110	Sun Belt
84	↑ 5	Kennesaw State	110	Conference USA
84	↑ 5	Louisiana	110	Sun Belt
84	↑ 5	Middle Tennessee	110	Conference USA
84	↑ 5	Navy	110	American Athletic
84	↑ 5	Old Dominion	110	Sun Belt
84	↑ 5	Rice	110	American Athletic
84	↑ 5	San Diego State	110	Pac-12
84	↑ 5	South Alabama	110	Sun Belt
84	↑ 5	Southern Miss	110	Sun Belt
84	↑ 5	Temple	110	American Athletic
84	↑ 5	UTSA	110	American Athletic
98	↓ 9	UNLV	106	Mountain West
99	↓ 28	Eastern Michigan	105	Mid-American
100	↓ 31	Washington State	104	Pac-12
101	↑ 27	Air Force	100	Mountain West
101	↑ 27	Army	100	American Athletic
103	↓ 32	Akron	96	Mid-American
103	↓ 32	Ball State	96	Mid-American
103	↓ 32	Kent State	96	Mid-American
103	↓ 32	Miami (OH)	96	Mid-American
103	↓ 32	Missouri State	96	Conference USA
103	↓ 32	Northern Illinois	96	Mountain West
103	↓ 32	Oregon State	96	Pac-12
103	↓ 32	Tulane	96	American Athletic
103	↓ 32	UTEP	96	Mountain West
103	↓ 32	Western Kentucky	96	Conference USA
113	↓ 42	Bowling Green	90	Mid-American
113	↓ 42	Utah State	90	Pac-12
115	↓ 26	Arkansas State	88	Sun Belt
115	↓ 26	Boise State	88	Pac-12
115	↓ 26	Central Michigan	88	Mid-American
115	↓ 26	Coastal Carolina	88	Sun Belt
115	↓ 26	East Carolina	88	American Athletic
115	↓ 26	Florida Atlantic	88	American Athletic
115	↓ 26	Fresno State	88	Pac-12
115	↓ 26	Marshall	88	Sun Belt
115	↓ 26	New Mexico State	88	Conference USA
115	↓ 26	North Texas	88	American Athletic
115	↓ 26	Ohio	88	Mid-American
115	↓ 26	Sam Houston	88	Conference USA
115	↓ 26	Texas State	88	Pac-12
115	↓ 26	Toledo	88	Mid-American
115	↓ 26	UAB	88	American Athletic
115	↓ 26	UL Monroe	88	Sun Belt
115	↓ 26	Western Michigan	88	Mid-American
132	↓ 43	Charlotte	82	American Athletic
133	↓ 5	Florida International	80	Conference USA
133	↓ 5	Jacksonville State	80	Conference USA
133	↓ 5	Liberty	80	Conference USA
133	↓ 5	Sacramento State	80	Mid-American
133	↓ 5	Wyoming	80	Mountain West
138	↓ 67	Hawai'i	72	Mountain West
139	–	Idaho State*	30	Big Sky
139	–	Tarleton State*	30	UAC
141	–	The Citadel*	28	Southern

* FCS