In Roulette, the “House Edge” is visible on the wheel — the green Zero pocket. In sports betting, the edge is hidden inside the odds themselves. Bookmakers build their margin into both sides of every market, and the total implied probability of all outcomes adds up to more than 100%. That excess is the bookmaker’s expected profit.
Our Sportsbook House Edge Calculator reveals this hidden margin instantly. It works for both 2-way markets (NFL spreads, NBA moneylines, tennis) and 3-way markets (soccer 1X2, NHL regulation lines), and returns the true win probability and fair odds for every outcome, not just one.
House Edge Calculator
Vig / Hold| Outcome | Implied Prob | True Prob (No-Vig) | Fair Odds |
|---|
How to Use the Calculator
- Select Odds Format: Choose between American (e.g., -110) or Decimal (e.g., 1.91).
- Select Market Type:
- 2-Way: NFL spreads, NBA moneylines, tennis, NHL puck lines (no draw possible).
- 3-Way: Soccer 1X2, NHL regulation 60-minute lines (draw is a separate outcome).
- Enter Odds: Input the prices for every outcome the sportsbook offers in that market.
- Read the Output:
- House Edge: The percentage of every dollar wagered that the bookmaker expects to keep over the long run, also called theoretical hold.
- Total Implied Probability and Overround: The combined implied probability of all outcomes (always above 100%) and the excess above 100% (the raw vig).
- Per-Outcome Table: Implied probability, true (no-vig) probability, and fair odds for every outcome.
Related tools: For step-by-step devigging across multiple methods (multiplicative, power, additive), see our No-Vig Calculator. To size bets once you have a fair-odds estimate, use the Kelly Criterion Calculator. To compare prices across books, the Arbitrage Calculator tells you whether a guaranteed profit exists.
House Edge, Hold, Overround, Vig — What’s the Difference?
These terms are often used interchangeably but have slightly different meanings. Getting them straight matters when comparing sportsbooks or reading sharp-betting analysis.
- Overround = Total implied probability − 100%. For two-110 lines: 104.76% − 100% = 4.76%. This is the raw “extra” probability a bookmaker bakes into the market.
- House Edge / Hold = 1 − (1 / Total implied probability). For the same market: 1 − (1/1.0476) = 4.55%. This is what the bookmaker expects to keep from the total handle if betting volume is balanced — the more honest measure of profit.
- Vig (or Juice) is the colloquial term for either of the above, depending on who is using it. Sharp bettors and analytics platforms generally mean overround; recreational sources sometimes mean hold.
The two figures are close but not identical. Our calculator displays both so you can see the difference.
Real-World Examples: Reading the Lines
Example 1: The Standard Line (Industry Baseline)
DraftKings offers -110 on the Chiefs and -110 on the Bills.
- Total implied probability: 104.76%
- Overround: 4.76%
- House edge (hold): 4.55%
- Fair odds for either side: +100 (decimal 2.00)
This is the industry standard for major US sportsbooks on mainline markets. It is the price you pay for the service of a balanced market with deep liquidity.
Example 2: A High-Margin Niche Market
A smaller book offers -120 on a fight favorite and -120 on the underdog.
- Total implied probability: 109.09%
- House edge: 8.33%
- Verdict: Nearly double the industry standard. Common in player props, niche sports, and lower-tier MMA cards. If you cannot find a sharper line at another book, this market is generally unplayable for value bettors.
Example 3: Soccer 1X2 (3-Way)
A Premier League match: Home 2.50, Draw 3.20, Away 2.80.
- Total implied probability: 106.96%
- House edge: 6.51%
- Insight: 3-way markets typically carry higher edge than 2-way markets because spreading vig across three outcomes is harder for bookmakers to balance. A 6–7% edge on Premier League 1X2 is normal; below 5% is sharp; above 8% is recreational-book pricing.
Vig Benchmarks by Market Type
| Market | Typical House Edge (Sharp Books) | Typical House Edge (Recreational Books) |
|---|---|---|
| NFL spreads, NBA totals (2-way) | 1.5–3% | 4–5% |
| MLB moneylines, NHL puck lines | 2–3% | 4–5% |
| Tennis moneylines | 2–4% | 5–7% |
| Soccer 1X2 (3-way) | 3–5% | 6–8% |
| Player props | 4–6% | 7–12% |
| Same-game parlays (SGP) | 10–25%+ | 15–30%+ |
“Sharp books” refers to market-makers like Pinnacle and Circa Sports that accept large limits and price aggressively. “Recreational books” includes most consumer-facing US sportsbooks (DraftKings, FanDuel, BetMGM, Caesars). The difference is large enough that line shopping across books is the single most reliable edge available to most bettors.
Why the Edge Matters for Long-Term Profitability
The house edge is not a tax — it is a hurdle. To break even at -110 odds, you need to win 52.38% of your bets. Anything below that and you lose money over time, no matter how lucky any individual streak. The higher the edge, the higher the breakeven win rate:
- House edge 4.55% (-110/-110): need 52.38% to break even
- House edge 6.51% (typical 1X2): need 52.94% per side to break even
- House edge 8.33% (-120/-120): need 54.55% to break even
- House edge 15% (typical SGP): need 57.5% on equivalent odds to break even
Sharp bettors avoid high-vig markets because the breakeven hurdle becomes too steep. They concentrate on liquid, low-vig markets (NFL spreads at sharp books, tennis at Pinnacle) where a small modeling edge can translate into long-term profit.
Calculator Limitations
- The fair-odds calculation uses the multiplicative devig method (proportional). For lopsided markets (heavy favorites), bookmakers tend to apply more vig to the favorite, which the multiplicative method does not capture exactly. For more advanced devig methods (power, additive), use our No-Vig Calculator.
- The calculator assumes the market is properly priced. If the offered odds reflect a mispriced or stale line (e.g., post-injury news), the implied probabilities will be misleading.
- Push possibilities in spread and total markets are not modeled. The calculator treats every market as a clean 2-way or 3-way settlement.
- The hold figure assumes balanced action. If a bookmaker has uneven exposure (more action on one side), their actual realized hold can differ from the theoretical figure.
Frequently Asked Questions
What is a good House Edge in sports betting?
A competitive baseline for major-league 2-way markets (NFL, NBA, MLB) is 4–5% at recreational US books and 1.5–3% at sharp books like Pinnacle. Anything below 4% is good value; anything above 7% is expensive. 3-way markets (soccer 1X2) run higher — 5–7% is typical, with 8%+ being recreational-book pricing.
What are “Fair Odds”?
Fair Odds (or No-Vig Odds) are the prices a bookmaker would offer if they had zero margin. They represent the market’s consensus estimate of true probability after stripping out the bookmaker’s fee. If your own analysis says a side has a higher true probability than the fair odds imply, you have identified a positive expected value (+EV) bet.
Why do player props and SGPs have higher vig?
Three reasons. First, liquidity is lower — fewer bettors mean less efficient pricing, so books widen margins for safety. Second, the markets are harder to model, especially correlation in same-game parlays, so books charge a margin to cover modeling uncertainty. Third, recreational bettors love these markets and are less price-sensitive, so books can extract higher margins without losing volume.
What’s the difference between Overround and House Edge?
Overround is the sum of implied probabilities minus 100% — the raw “extra” the bookmaker bakes into the market. House Edge (theoretical hold) is the percentage of total wagered that the bookmaker expects to keep, calculated as 1 − (1/total implied probability). For -110/-110, overround is 4.76% and house edge is 4.55%. The two are close but distinct; sharp betting analysis usually quotes overround, while casino-style discussion uses hold.
Which sportsbooks have the lowest vig?
Pinnacle is the global standard for low-vig pricing on major markets, often charging 1.5–3% on NFL spreads, NBA totals, and tennis. Circa Sports in the US offers similar pricing. Most recreational US books (DraftKings, FanDuel, BetMGM, Caesars) charge 4–6% on the same markets. The vig gap is often the difference between profitable and unprofitable betting at scale.
Does line shopping really matter?
It is the most reliable edge available to most bettors. Saving 1–2% on average vig across thousands of bets is enough to flip a small losing bettor into a small winner without any modeling improvement. Even casual bettors benefit by checking 2–3 books before each wager and taking the best price.
How do I know if a bet has positive value?
Compare the bookmaker’s offered odds to the fair (no-vig) odds. If the bookmaker offers higher odds than the fair price, the bet has positive expected value (+EV) — the market disagrees with itself, and you are getting paid more than the consensus probability implies. To act on the edge, your own probability estimate must also be at least as high as the fair price; otherwise the value disappears.
Responsible gambling notice: Understanding house edge does not eliminate it. Even the lowest-vig sportsbooks make money over time, and most bettors lose more than they win regardless of how carefully they shop lines. Never wager more than you can afford to lose. If gambling stops being entertainment, support is available — visit BeGambleAware (UK) or call 1-800-GAMBLER (US).