The top 2 books are tightly clustered — only 0.25% separates them. The spread between #1 and #18 is 4.88% — book choice matters significantly for NCAAB.
College basketball offers one of the most expansive betting markets in American sports, with over 350 Division I teams generating thousands of games between November and early April. The sheer volume creates significant variation in market efficiency. Marquee matchups between ranked programs in power conferences tend to attract sharp money and tighter lines, while mid-major and early-season tournament games often feature softer numbers where books have less data and less incentive to sharpen their pricing. The sport's possession-based scoring, frequent lead changes, and wide talent gaps between tiers make point spreads particularly volatile — a dynamic that rewards bettors who dig deeper than surface-level rankings.
Vig in NCAAB markets varies more dramatically than in professional sports. For high-profile games — think Big Ten rivalries or ACC showdowns airing on national television — sportsbooks compete aggressively, and margins on sides and totals can approach the standard -110/-110 baseline. But for lower-profile contests, especially those involving smaller conferences or early-season buy games, books frequently widen their margins because the betting volume doesn't justify tight pricing. This makes vig comparison especially valuable in college basketball; the difference between books on the same game can be meaningfully larger than what you'd see in the NFL or NBA.
Seasonally, the sharpest odds tend to emerge during conference play in January through March, when sample sizes grow and books can model teams more accurately. The NCAA Tournament represents a unique peak — massive public betting volume forces books to tighten lines across the board, often producing some of the most competitive vig of the entire season. Key factors shaping NCAAB odds include home-court advantage, which remains more pronounced than in professional basketball, roster turnover driven by the transfer portal and NBA draft declarations, and the impact of individual player absences on teams with thinner rosters. Monitoring injury reports and lineup changes is critical, as a single player's status can swing a spread by several points.
NCAAB Sportsbook Vig Rankings
| # | Sportsbook | Avg Vig | Grade | Moneyline | Spreads | Totals | Events |
|---|---|---|---|---|---|---|---|
| 1 | Pinnacle | 2.89% | A | 2.41% | 2.42% | 3.84% | 1 |
| 2 | theScore Bet (ESPN Bet) | 3.14% | B+ | 2.34% | 2.36% | 4.71% | 1 |
| 3 | LowVig.ag | 3.54% | B+ | 3.99% | 2.83% | 3.79% | 1 |
| 4 | Bovada | 4.35% | B | 3.57% | 4.71% | 4.76% | 1 |
| 5 | BetUS | 4.44% | B | 3.84% | 4.71% | 4.76% | 1 |
| 6 | BetOnline.ag | 4.48% | B | 4.02% | 4.71% | 4.71% | 1 |
| 7 | BetMGM | 4.57% | B | 4.25% | 4.71% | 4.76% | 1 |
| 8 | DraftKings | 4.61% | B | 4.33% | 4.76% | 4.75% | 1 |
| 9 | Fanatics | 4.65% | B | 4.41% | 4.76% | 4.76% | 1 |
| 10 | FanDuel | 4.75% | B | 4.60% | 4.95% | 4.71% | 1 |
| 11 | Caesars | 4.75% | B | 4.72% | 4.76% | 4.76% | 1 |
| 12 | ReBet | 4.82% | B | 4.07% | 5.64% | 4.76% | 1 |
| 13 | MyBookie.ag | 4.84% | B | 5.00% | 4.76% | 4.76% | 1 |
| 14 | Hard Rock Bet | 5.10% | C+ | 5.88% | 4.71% | 4.71% | 1 |
| 15 | Bally Bet | 5.21% | C+ | 5.75% | 5.14% | 4.73% | 1 |
| 16 | betPARX | 5.21% | C+ | 5.75% | 5.14% | 4.73% | 1 |
| 17 | BetRivers | 5.58% | C+ | 5.75% | 5.58% | 5.41% | 1 |
| 18 | Fliff | 7.77% | D | 7.24% | 8.03% | 8.03% | 1 |
Best Line Leaders
Which sportsbook offers the best odds most often across 1 events:
| # | Sportsbook | Best Lines |
|---|---|---|
| 1 | LowVig.ag | 3 |
| 2 | DraftKings | 2 |
| 3 | Pinnacle | 2 |
| 4 | BetMGM | 1 |
| 5 | theScore Bet (ESPN Bet) | 1 |
| 6 | FanDuel | 1 |
| 7 | Bally Bet | 1 |
| 8 | Hard Rock Bet | 1 |
Frequently Asked Questions
Which sportsbook has the lowest vig for NCAAB?
Pinnacle currently has the lowest average vig for NCAAB at 2.89%, earning a grade of A.
How do sportsbook odds compare for NCAAB?
We compare 18 sportsbooks for NCAAB. The vig ranges from 2.89% (Pinnacle) to 7.77% (Fliff).
When do small vig differences matter for NCAAB?
The top two books (Pinnacle and theScore Bet (ESPN Bet)) are separated by just 0.25%. While small, this adds up over volume — a bettor placing $1,000/week saves roughly $3 per week by choosing the lower-vig book.
Why is college basketball vig so variable?
NCAAB has hundreds of teams and thousands of games per season. Major conference matchups attract decent volume and competitive vig, but mid-major and early-season games see far less action. Sportsbooks compensate with wider margins on lower-profile games.
When is NCAAB season?
College basketball runs from November through early April, culminating in March Madness (the NCAA Tournament). The tournament generates massive betting interest and typically features some of the best vig of the NCAAB season.
Does March Madness have better vig than regular season?
Generally yes. March Madness is one of the most heavily bet events in American sports. The flood of casual and sharp money forces books to tighten their lines. Tournament vig is often 1–2% lower than early-season college basketball.
What is vig (vigorish) in sports betting?
Vig — short for vigorish, also called juice or overround — is the margin a sportsbook builds into its odds. It's the difference between the true probability of an outcome and what the odds imply. Lower vig means you keep more of your winnings on every bet. For example, a standard -110/-110 line has about 4.76% vig.
How often is this data updated?
We pull fresh odds from The Odds API three times per day — at 6:00 AM, 2:00 PM, and 10:00 PM UTC. Each snapshot captures the latest lines from every sportsbook that has posted odds. The timestamp at the top of the page shows the most recent refresh.
How is the vig grade calculated?
Each sportsbook is graded on a letter scale based on average vig: A+ (under 2%) is exceptional, A (2–3%) is excellent, B+ (3–4%) is above average, B (4–5%) is the industry standard, C (5–6%) is below average, and D (above 6%) indicates high-juice markets.
Why does lower vig matter for bettors?
Lower vig directly impacts your long-term returns. A bettor placing $1,000 per week at a book with 4% vig loses roughly $40/week to the house edge. At 2% vig, that drops to $20/week — a $1,040 difference over a year. For serious bettors, shopping for lower vig is one of the most reliable ways to improve profitability.
How We Calculate These Numbers
- Data Source
- All odds on this page come from The Odds API, which aggregates real-time lines from licensed US and offshore sportsbooks. We track moneyline, spread, and totals markets across every sport with active betting lines.
- Update Frequency
- We pull a fresh snapshot of every tracked market three times per day — at 6:00 AM, 2:00 PM, and 10:00 PM UTC. Each snapshot captures the latest lines from every sportsbook that has posted odds for a given event. The timestamp at the top of each page tells you exactly when the data was last refreshed.
- Vig Calculation
- Vig (short for vigorish, also called juice or overround) measures the margin a sportsbook builds into its odds. We calculate it by converting the odds on each side of a market to implied probabilities, summing those probabilities, and subtracting 100%. For example, a market priced at -110/-110 implies 52.38% on each side — a total of 104.76%, meaning a vig of 4.76%. Lower vig means better value for bettors because you keep more of your winnings.
- Per-Market Breakdown
- We compute vig separately for each market type: moneyline (h2h), point spreads, and totals (over/under). The "average vig" shown for each sportsbook is the mean across all market types weighted by the number of events sampled in each market.
- Grading Scale
- Every sportsbook receives a letter grade based on its average vig: A+ (under 2%) is exchange-level pricing. A (2–3%) is very competitive. B+ (3–4%) is above average. B (4–5%) is the industry standard — a -110/-110 line is 4.76%. C+ (5–6%) is slightly below average. C (6–7%) is below average. D (7–8%) is high vig. D− (8–10%) is very high vig. F (10%+) is predatory pricing. See the full Vig Index Methodology for formulas, worked examples, and known limitations.
- Trend Tracking
- We store daily snapshots for 30 days, allowing us to show 24-hour and 7-day vig trends. A downward trend (improving) means sportsbooks are tightening their lines — often in response to increased competition or higher betting volume as a season heats up.