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.

888sport NPB Odds

Q: Can I still compare sportsbooks for NPB?

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

NPB Odds Not Currently Available

NPB 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 NPB lines, the full analysis will become available.

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

Not sure which sportsbook is right for you? Try the Sportsbook Selector — answer four questions and get a personalized recommendation backed by live vig data.

The NPB regular season typically runs from late March through early October, with the Climax Series playoffs extending into late October and the Japan Series concluding by early November. Preseason betting markets usually open in January, coinciding with spring training camp announcements and roster finalization. This extended off-season window from November through March creates substantial opportunities for savvy bettors to capitalize on early market inefficiencies before public attention returns to Japanese baseball.

Off-season NPB betting centers heavily on pennant race futures for both the Central and Pacific Leagues, along with Japan Series championship odds that often favor traditional powerhouses like the Giants and SoftBank Hawks. MVP futures markets typically open with premium juice on proven stars, while win total markets offer particular value given NPB's 143-game schedule and the dramatic impact of foreign player signings. The annual posting system creates unique prop betting opportunities around which players will move to MLB, while the NPB draft in October generates futures action on rookie of the year markets. Free agency periods in November and December significantly shift championship odds as teams rebuild their rotations and lineups.

Sportsbooks traditionally post the loosest lines during the January-February window when recreational interest remains minimal, with vig margins often 15-20% higher than peak season rates. The most dramatic odds movements occur following major foreign player signings, particularly when established MLB veterans join contending teams, and coaching changes at marquee franchises like Hanshin or Chunichi. Preseason exhibition performance against visiting MLB teams in March can create overreactions in win total markets, while late-breaking injury news to ace pitchers or cleanup hitters during spring training camps generates the sharpest line movement of the entire off-season cycle.

In-Season Sports

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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.