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No-vig calculator
Every two-way line has hold baked in, so the two implied probabilities add up to more than 100%. The calculator takes the hold out and shows the fair American price and true percent for each side.
Type both sides in American odds. It uses one method: each side's implied probability divided by the sum. Not Shin, power, or additive.
The formula
Get each side's implied probability from its American odds, then divide each by the sum of the two. That sum is the overround. Hold here is (overround - 1) times 100. Fair American is the no-vig percent turned back into a price.
Example 1
-110 and -110.
Hold 4.76%. Overround 104.76%. Fair A -100. Fair B -100. True A 50.00%. True B 50.00%.
Example 2
-150 and +130.
Hold 3.48%. Overround 103.48%. Fair A -138. Fair B +138. True A 57.98%. True B 42.02%.
Limits
Fair odds are just the pair you typed with the vig removed. They're not a forecast or a price any book has to offer. Because the split is proportional, a very lopsided pair can come out differently under another method. Two-way only. It doesn't place bets.
Runs in your browser. Nothing is sent to EdgeTilt. Compare two books on arbitrage and hold.
FAQ
What is the hold on -110/-110?
4.76%. The overround is 104.76%. Each fair price is -100, and each true probability is 50.00%.
Why does fair even money print as -100?
The page formats a 50% fair probability as American -100.
Does this remove vig from one side only?
No. It needs both sides. A single price still has the hold in it.
Which method is this?
Proportional. Each implied probability divided by the sum of both.
Can I enter three sides?
No. Two American prices.