The Korean Baseball Organization offers a distinctive betting proposition compared to MLB or NPB. KBO games tend to be higher-scoring affairs, with run totals frequently landing in the 9-11 range thanks to smaller ballparks, a livelier ball, and lineups built around aggressive contact hitting. The ten-team league creates a compact schedule where divisional familiarity runs deep, and sharp bettors who track pitching rotations and bullpen usage closely can find edges that casual markets overlook. Market depth is narrower than MLB — expect robust moneyline and run total coverage, but first-five-innings lines, player props, and alternate run lines are less consistently available and often carry wider margins when they do appear.
Vig on KBO markets tends to run wider than what bettors encounter with MLB, largely because of lower overall handle and less liquidity. While a competitive MLB moneyline might carry a combined vig of 3-5%, KBO lines frequently sit in the 5-8% range, with some books pushing even higher on secondary markets. This makes shopping across sportsbooks particularly valuable — the spread between the sharpest and softest books on a given KBO game can represent meaningful cents on the dollar. Books with dedicated Asian league coverage or those drawing from sharper offshore origination tend to post tighter numbers.
The KBO regular season runs from late March through October, with the postseason extending into November. Early-season lines often carry the widest margins as books adjust to roster changes, new foreign player signings (each team carries up to three), and pitching rotation shuffles. As the season progresses and data accumulates, lines tighten noticeably, with midsummer typically offering the most competitive vig. Weather is a meaningful factor — South Korea's monsoon season in July and August leads to frequent rain delays and postponements, which can disrupt pitching schedules and create value for bettors tracking bullpen fatigue. Home/away splits matter more than casual bettors assume, with certain parks like Gwangju and Daejeon playing dramatically differently than Seoul's Jamsil Stadium.
Analysis updated September 6, 2026. Odds data above refreshes hourly.
↑ 7-day trend: KBO average vig has worsened by 0.17 percentage points over the past week (from 6.14% to 6.31%). Odds margins are widening, meaning bettors are getting less value per wager.
Cross-Sport Vig Comparison
KBO averages 6.31% vig across 15 sportsbooks. Here's how that compares to other active sports:
Vig Rankings
| # | Sportsbook | Avg Vig | Grade | ML | Spreads | Totals | Events |
|---|---|---|---|---|---|---|---|
| 1 | BetOnline.ag | 3.92% | B+ | 3.55% | 3.57% | 4.65% | 5 |
| 2 | LowVig.ag | 3.92% | B+ | 3.55% | 3.57% | 4.65% | 5 |
| 3 | Pinnacle | 4.79% | B | 4.82% | 4.82% | 4.74% | 5 |
| 4 | DraftKings | 5.12% | C+ | 5.11% | 5.17% | 5.08% | 5 |
| 5 | FanDuel | 5.34% | C+ | 4.91% | 5.55% | 5.56% | 5 |
| 6 | Fanatics | 5.42% | C+ | 3.70% | 5.85% | 6.72% | 5 |
| 7 | MyBookie.ag | 5.99% | C+ | 6.00% | 6.02% | 5.97% | 5 |
| 8 | Caesars | 6.37% | C | 6.42% | 5.81% | 6.88% | 5 |
| 9 | Bovada | 6.65% | C | 6.47% | 6.59% | 6.88% | 5 |
| 10 | Hard Rock Bet | 6.68% | C | 6.58% | 6.74% | 6.72% | 5 |
| 11 | theScore Bet (ESPN Bet) | 6.80% | C | 6.82% | 6.89% | 6.68% | 5 |
| 12 | Bally Bet | 7.14% | D | 6.02% | 7.74% | 7.67% | 5 |
| 13 | BetRivers | 7.14% | D | 6.02% | 7.74% | 7.67% | 5 |
| 14 | Fliff | 7.97% | D | 7.36% | 8.51% | 8.03% | 2 |
| 15 | ReBet | 11.39% | F | 12.14% | 11.01% | 11.03% | 5 |
Frequently Asked Questions
Which sportsbook has the lowest KBO vig?
BetOnline.ag currently has the lowest vig at 3.92%, 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.