Nippon Professional Baseball offers a distinct betting environment compared to its MLB counterpart. NPB games tend to be lower-scoring affairs, with tighter pitching performances, more frequent sacrifice bunts, and a strategic emphasis on small ball that compresses run totals. The 12-team league split into the Central and Pacific Leagues creates a smaller universe of matchups, which means sharper bettors can develop deep expertise on specific teams and pitchers. However, the narrower market also means sportsbooks don't always invest the same resources into line-setting as they do for MLB, which can create both opportunity and risk depending on where you're placing wagers.
Vig on NPB markets tends to run wider than on major North American sports. Because betting volume is lower — particularly from Western-facing sportsbooks — books build in extra margin to protect against sharp action and thinner liquidity. Moneyline margins of 5–7% are common, and totals markets can carry even more juice. That said, margins vary considerably across books, and the gap between the sharpest and softest lines on any given NPB game can be significant. Comparing vig across sportsbooks is especially valuable here, as the difference between a 4.5% and a 7% margin on the same game directly impacts long-term profitability.
The NPB regular season runs from late March through October, followed by the Climax Series and Japan Series in the fall. Early-season lines often carry the widest margins as books calibrate to roster changes, new foreign imports, and spring form. As the season progresses and data accumulates, lines generally tighten — particularly for high-profile matchups and during the postseason. Bettors should pay close attention to starting pitcher matchups, park factors (several NPB stadiums play very differently), and weather conditions, especially humidity and wind during Japan's rainy season in June and July. Home/away splits also matter more than casual bettors might expect, as travel fatigue and crowd influence play measurable roles in a league where competitive balance is relatively tight across rosters.
Analysis updated September 6, 2026. Odds data above refreshes hourly.
↓ 7-day trend: NPB average vig has improved by 0.20 percentage points over the past week (from 6.45% to 6.25%). Sportsbooks are tightening their lines — a good sign for bettors.
Cross-Sport Vig Comparison
NPB averages 6.25% vig across 17 sportsbooks. Here's how that compares to other active sports:
| Sport | Avg Vig | vs NPB |
|---|---|---|
| NPB | 6.25% | — |
| KBO | 6.01% | NPB runs 0.24 pts higher |
| MLB | 4.39% | NPB runs 1.86 pts higher |
| NCAAF | 6.15% | NPB runs 0.10 pts higher |
| NFL | 4.70% | NPB runs 1.55 pts higher |
Vig Rankings
| # | Sportsbook | Avg Vig | Grade | ML | Spreads | Totals | Events |
|---|---|---|---|---|---|---|---|
| 1 | BetOnline.ag | 4.07% | B | 4.03% | 3.57% | 4.60% | 4 |
| 2 | LowVig.ag | 4.07% | B | 4.03% | 3.57% | 4.60% | 4 |
| 3 | Pinnacle | 4.11% | B | 3.69% | 4.26% | 4.39% | 5 |
| 4 | FanDuel | 5.53% | C+ | 5.08% | 5.77% | 5.75% | 5 |
| 5 | DraftKings | 5.54% | C+ | 5.25% | 5.38% | 5.97% | 5 |
| 6 | BetUS | 5.67% | C+ | 6.27% | 4.47% | 6.27% | 4 |
| 7 | MyBookie.ag | 5.81% | C+ | 6.40% | 5.64% | 5.37% | 5 |
| 8 | Fanatics | 6.40% | C | 5.06% | 6.81% | 7.32% | 5 |
| 9 | BetMGM | 6.48% | C | 6.18% | 6.97% | 6.28% | 4 |
| 10 | Hard Rock Bet | 6.53% | C | 6.28% | 6.71% | 6.60% | 5 |
| 11 | Bovada | 6.59% | C | 6.22% | 6.64% | 6.90% | 5 |
| 12 | Caesars | 6.73% | C | 6.60% | 6.73% | 6.88% | 5 |
| 13 | theScore Bet (ESPN Bet) | 7.01% | D | 6.83% | 7.56% | 6.66% | 5 |
| 14 | Bally Bet | 7.76% | D | 6.09% | 8.50% | 8.36% | 5 |
| 15 | 888sport | 7.77% | D | 7.09% | 7.83% | 8.38% | 5 |
| 16 | BetRivers | 7.84% | D | 6.09% | 8.61% | 8.48% | 5 |
| 17 | ReBet | 8.40% | D- | 9.10% | 8.05% | 7.98% | 5 |
Frequently Asked Questions
Which sportsbook has the lowest NPB vig?
BetOnline.ag currently has the lowest vig at 4.07%, earning a grade of B.
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.