LAST NIGHT · MLBD. Swanson (CHC): 3 H · 3 HR · 8 RBI in a win over SD — Standout Index 98
LAST NIGHT · MLBM. Conforto (CHC): 3 H · 2 HR · 4 RBI in a win over SD — Standout Index 93
TRANSACTION · MLBBraves: Agreed to terms with OF Luis Consoro on a minor league contract (Jul 1)
LAST NIGHT · MLBT. Bradley (MIN): 5.0 IP · 11 K · 1 ER in a win over HOU
LAST NIGHT · MLBT. Melton (DET): 6.1 IP · 7 K in a win over NYY
TRANSACTION · MLBRoyals: Placed RHP Connor Seabold on the 15-day IL (Jul 1)
TRANSACTION · MLBPirates: Agreed to terms with SS Ryan McCarty on a minor league contract (Jul 1)
TRANSACTION · NBAWizards: Re-signed F Jamir Watkins to a two-way contract (Jul 1)
TRANSACTION · NBATrail Blazers: Signed C Branden Carlson to a contract (Jul 1)
TRANSACTION · NBAMagic: Signed F Jonathan Isaac and C Nikola Vucevic to contracts (Jul 1)
TONIGHT · WNBAATL @ WSH, 7/2 - 7:30 PM EDT — ATL -7.5
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Free tool

Hold
Calculator

Enter two prices and see the sportsbook margin, raw implied probabilities, and no-vig fair probabilities.

Questions, answered

What is sportsbook hold?+

Hold is the amount by which the two posted implied probabilities add up to more than 100%. That excess is the built-in margin.

Are fair probabilities predictions?+

No. They are the market's own probabilities after removing margin. They are a baseline, not a forecast.

Why does hold matter?+

Higher hold makes a market more expensive. The calculator shows the price of the market, not which side to take.

Book hold
4.76%
margin over 100%
Side A fair prob
50.0%
+100
Side B fair prob
50.0%
+100
Side A raw implied
52.4%
Side B raw implied
52.4%

Fair probabilities are the posted market after removing margin. They are not a forecast or a recommendation. 21+ · Bet responsibly

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How it works

  • Each American price converts to an implied probability.
  • The two probabilities usually add above 100%; that excess is the hold.
  • Fair probabilities divide each raw implied number by the two-way total.