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 presents one of the most complex betting landscapes in American sports. With over 350 Division I teams spanning 32 conferences, the sheer volume of games — often 80 or more on a single day during peak season — creates significant variation in market efficiency. Unlike the NBA, where rosters are relatively stable and well-scouted, NCAAB features annual roster turnover through recruiting classes and the transfer portal, making early-season lines particularly soft. The wide range in talent level between power conference matchups and mid-major games means scoring patterns and pace of play vary dramatically, and bettors who understand tempo-adjusted metrics and conference-specific tendencies hold a meaningful edge, especially in less-followed leagues.
Vig in NCAAB markets tends to be wider than in professional sports like the NFL or NBA, particularly for lower-profile games. Sportsbooks price marquee matchups — top-25 showdowns, conference tournament finals, and March Madness games — with tighter margins because those lines attract sharp action and higher volume, forcing books to compete. But a Tuesday night game between two unranked mid-major teams will often carry noticeably inflated juice, sometimes exceeding -115 on both sides, because books face less pressure to sharpen those numbers. Comparing vig across sportsbooks on these less-liquid games is where bettors can find the most meaningful savings over a full season.
The NCAAB season runs from early November through the national championship in early April, with distinct phases that affect odds quality. Non-conference play in November and December features unfamiliar matchups and limited data, leading to wider margins and more exploitable lines. Conference play from January through early March brings more predictable pricing as books accumulate head-to-head data. The NCAA Tournament in March is the peak betting period — massive public volume tightens vig considerably, but it also skews lines toward popular brands and higher seeds. Key factors influencing NCAAB odds include home-court advantage, which remains far more impactful than in the pros, roster availability affected by injuries or suspensions, and matchup dynamics like rebounding differentials and three-point shooting variance that can swing outcomes in ways raw power ratings don't fully capture.
Analysis updated September 6, 2026. Odds data above refreshes hourly.
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 every hour, on the hour (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 average vig: A+ (under 2%) is exchange-level pricing, A (2–3%) very competitive, B+ (3–4%) above average, B (4–5%) the industry standard, C+ (5–6%) slightly below average, C (6–7%) below average, D (7–8%) high vig, D− (8–10%) very high, F (10%+) predatory.
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 every hour, on the hour (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.