BetOnline vig, measured: 4.44%
BetOnline ranks #4 of 21 US sportsbooks by overround over the last 30 days (lower is cheaper). Its margin is below the field average of 5.08%. In that window it was one side of a cross-book arbitrage on 81 game-markets.
BetOnline vig by sport
| Sport | Overround | Rank in sport | Field average | Lines |
|---|---|---|---|---|
| NHL | 3.35% | #1 of 16 | 4.78% | 36,372 |
| MLB | 3.57% | #3 of 20 | 4.50% | 99,006 |
| NFL | 4.45% | #5 of 21 | 4.76% | 148,859 |
| NBA | 4.72% | #11 of 15 | 4.73% | 41,922 |
| MLS | 5.90% | #3 of 11 | 6.64% | 75,688 |
Daily margin, last 30 days
Overround per day by market type. Books adjust their margin around big slates and sharp action; the trend is more telling than any single day.
| Date | Moneyline | Spreads | Totals |
|---|---|---|---|
| Sep 19, 2026 | 3.10% | 4.60% | 4.90% |
| Sep 18, 2026 | 3.08% | 4.81% | 4.96% |
| Sep 17, 2026 | 3.24% | 4.93% | 4.99% |
| Sep 16, 2026 | 3.14% | 4.83% | 5.00% |
| Sep 15, 2026 | 3.08% | 4.88% | 5.03% |
| Sep 14, 2026 | 3.16% | 4.85% | 4.97% |
| Sep 13, 2026 | 3.06% | 4.63% | 4.80% |
| Sep 12, 2026 | 3.07% | 4.73% | 4.94% |
| Sep 11, 2026 | 3.04% | 4.88% | 4.99% |
| Sep 10, 2026 | 3.25% | 4.95% | 4.97% |
| Sep 9, 2026 | 3.06% | 4.68% | 4.88% |
| Sep 8, 2026 | 3.04% | 4.84% | 5.00% |
| Sep 7, 2026 | 3.08% | 5.16% | 5.21% |
| Sep 6, 2026 | 3.04% | 4.93% | 5.03% |
Which books disagree with BetOnline
An arbitrage needs two books on the same line at prices summing under 100%. These are the books that produced one with BetOnline most often over 30 days.
| Counterparty | Game-markets | Avg net edge | Max net edge | Last seen | |
|---|---|---|---|---|---|
| betPARX | 16 | 3.61% | 9.40% | Sep 18, 2026 | pair page → |
| FanDuel | 11 | 5.66% | 14.24% | Sep 8, 2026 | pair page → |
| DraftKings | 8 | 4.64% | 13.10% | Sep 17, 2026 | pair page → |
| Fanatics Sportsbook | 7 | 2.59% | 6.43% | Sep 17, 2026 | pair page → |
| BetRivers | 7 | 0.51% | 1.03% | Sep 15, 2026 | pair page → |
| Hard Rock Bet | 6 | 2.37% | 7.20% | Sep 18, 2026 | pair page → |
| Bovada | 5 | 3.15% | 9.31% | Sep 14, 2026 | pair page → |
| BetMGM | 5 | 7.68% | 12.73% | Sep 17, 2026 | pair page → |
| Caesars | 4 | 6.03% | 13.45% | Sep 18, 2026 | pair page → |
| ESPN BET | 4 | 1.90% | 6.12% | Sep 15, 2026 | pair page → |
| MyBookie | 4 | 2.02% | 3.43% | Sep 12, 2026 | pair page → |
| ReBet | 3 | 2.27% | 4.09% | Sep 13, 2026 | pair page → |
Recent BetOnline arbitrage examples
Measured at detection, net of fees, at the reference stake shown. These windows have closed; they are a record of what the market did, not a recommendation.
| Game | Market | Net edge | Profit at stake | Detected |
|---|---|---|---|---|
| Boston Red Sox @ Tampa Bay Rays · MLB | moneyline | 6.04% | $150.94 / $2,500 | Sep 18, 7:17 PM ET |
| Milwaukee Brewers @ Baltimore Orioles · MLB | moneyline | 2.73% | $68.21 / $2,500 | Sep 18, 7:17 PM ET |
| Boston Red Sox @ Texas Rangers · MLB | moneyline | 7.20% | $180.07 / $2,500 | Sep 17, 8:18 PM ET |
| Detroit Tigers @ Chicago White Sox · MLB | moneyline | 5.36% | $134.10 / $2,500 | Sep 17, 7:47 PM ET |
| Kansas City Royals @ Houston Astros · MLB | moneyline | 3.14% | $78.54 / $2,500 | Sep 17, 7:16 PM ET |
| Florida Panthers @ Carolina Hurricanes · NHL | total 6.5 | 1.15% | $28.63 / $2,500 | Sep 17, 5:15 PM ET |
| Athletics @ Tampa Bay Rays · MLB | total 7.5 | 1.65% | $41.15 / $2,500 | Sep 17, 1:26 PM ET |
| Athletics @ Tampa Bay Rays · MLB | spread 1.5 | 2.50% | $62.50 / $2,500 | Sep 17, 1:26 PM ET |
| Los Angeles Dodgers @ Cincinnati Reds · MLB | moneyline | 13.45% | $336.36 / $2,500 | Sep 17, 12:56 PM ET |
| Minnesota Twins @ Los Angeles Angels · MLB | moneyline | 1.93% | $48.19 / $2,500 | Sep 17, 5:20 AM ET |
| Kansas City Royals @ Houston Astros · MLB | moneyline | 0.34% | $8.59 / $2,500 | Sep 16, 8:14 PM ET |
| San Francisco Giants @ St. Louis Cardinals · MLB | moneyline | 6.43% | $160.66 / $2,500 | Sep 16, 1:22 PM ET |
Frequently asked questions
What is BetOnline's vig?
Over the last 30 days BetOnline's measured overround is 4.44% across all lines we recorded — 3.06% on moneylines, 4.76% on spreads and 4.90% on totals. That ranks #4 of 21 US books we scan (lower is cheaper).
Is BetOnline a low-vig sportsbook?
Relative to the 21 books we measure, yes: its 4.44% overall margin is below the field average of 5.08%.
Which books disagree with BetOnline most often?
betPARX — 16 game-markets in 30 days where the two books quoted the same line at prices that summed to less than 100%, averaging a 3.61% net edge. Next: FanDuel (11).
How is this measured?
For every line BetOnline posted that our scanner ingested, both sides' odds are converted to implied probabilities and summed; the excess over 100% is the overround. Figures are weighted by lines observed and averaged over 30 days. Nothing here is estimated — every number traces to recorded lines.
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