Spread betting in the NBL (National Basketball League) requires a bettor to back a team to win or lose by a specified margin of points. For example, if the Sydney Kings are listed at -6.5 against the Cairns Taipans, they need to win by seven or more points to cover. Unlike football codes where spreads tend to be tighter and lower-scoring dynamics create more variance, basketball's higher volume of possessions means NBL spreads can see significant movement based on lineup news, particularly around import player availability, which disproportionately impacts roster quality in a league with smaller squads.
The spreads market in the NBL tends to offer the most value when betting into early lines before sharp adjustments, especially during rounds where travel fatigue or back-to-back scheduling comes into play. Bettors should closely monitor injury reports released close to tip-off, as a single import going down can shift a true line by four to six points. In terms of vig, NBL spreads generally carry slightly higher margins than major American leagues like the NBA, with standard juice often exceeding the typical -110/-110 split. Comparing vig across books becomes particularly important here, as the difference between paying five-cent and seven-cent lines compounds meaningfully over a full season.
Analysis updated October 18, 2026. Odds data above refreshes hourly.
Cross-Sport spreads Vig Comparison
NBL spreads averages 5.55% vig across 2 sportsbooks. Here's how that compares to other active sports:
| Sport | Avg Vig | vs NBL |
|---|---|---|
| NBL | 5.55% | — |
| Basketball Euroleague | 5.64% | NBL runs 0.09 pts lower |
| NBA | 4.88% | NBL runs 0.67 pts higher |
| WNBA | 5.14% | NBL runs 0.41 pts higher |
| CFL | 5.14% | NBL runs 0.41 pts higher |
Vig Rankings
Frequently Asked Questions
Which sportsbook has the lowest NBL spreads vig?
BetRivers currently has the lowest vig at 5.46%, earning a grade of C+.
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.
What sportsbooks do you track?
We track both regulated US sportsbooks (DraftKings, FanDuel, BetMGM, Caesars) and offshore books (Bovada, BetOnline, MyBookie, BetUS, LowVig.ag, BetAnything). Data comes from The Odds API, which aggregates real-time lines from licensed sources.
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.