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.

What sportsbooks do you track?

We track both regulated US sportsbooks (DraftKings, FanDuel, BetMGM, Caesars) and offshore books (Bovada, BetOnline, MyBookie, BetUS, LowVig.ag, BetAnySports). Data comes from The Odds API, which aggregates real-time lines from licensed sources.

Best NBA Preseason Odds Today

Q: Can I still compare sportsbooks for NBA Preseason?

No live odds are currently available for NBA Preseason. In the meantime, check out our odds comparison page for other available options, or visit our overall Vig Index for cross-sport rankings.

NBA Preseason Odds Not Currently Available

NBA Preseason does not currently have odds in our data feed. When odds for events are available at sportsbooks they will be listed here. This page updates 3× daily from The Odds API — when sportsbooks begin posting NBA Preseason lines, the full analysis will become available.

In the meantime, check out our odds comparison page for other available options.

NBA preseason typically begins in early October and runs for approximately two weeks before the regular season tips off in mid-to-late October. The regular season spans from October through mid-April, followed by playoffs that extend into June. Preseason betting markets usually emerge in late August or early September, giving bettors several weeks to analyze roster changes and coaching adjustments before the games begin. This window provides unique opportunities to capitalize on early-season pricing inefficiencies, as sportsbooks are still calibrating their models based on offseason moves and player developments.

The most valuable preseason betting opportunities center around season-long futures markets that haven't yet incorporated all available information. Championship odds, conference winner futures, and regular season win totals often present the strongest value propositions during this period. NBA MVP futures can be particularly lucrative, as books frequently undervalue players on improved rosters or overvalue aging superstars. Draft-related props, including Rookie of the Year markets, typically offer sharp value immediately after the draft in June but before preseason games reveal rookie playing time and role clarity. Free agency signings and trades also create temporary pricing gaps, especially when star players join new teams and win total adjustments lag behind the actual roster impact.

Preseason betting markets traditionally feature looser margins compared to regular season action, with sportsbooks offering more generous odds on longshot futures and alternative markets. The optimal value window typically occurs in the first two weeks of September, before preseason games begin providing concrete data about rotations, chemistry, and health. Major odds movements during this period are driven by late-roster additions, coaching scheme changes, and injury news from training camp. Preseason game performances can create overreactions in live betting markets, but rarely justify significant adjustments to season-long futures unless they reveal fundamental issues with star players or team chemistry that weren't apparent during the offseason.

In-Season Sports

These sports have active odds right now:

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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.