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AiOddsLab
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Is this bet worth it?

Before you tap "Place Bet," find out what the market actually thinks. Paste your odds or upload a bet slip — we'll show you fair odds, implied probability, expected edge, and a plain-English verdict.

How the check works

Every sportsbook bakes a margin — the vig — into every line. A standard −110 / −110 market carries about 4.5% built-in hold. To know if a bet is "worth it," you have to strip that hold out and see the true two-way probability.

  1. 1. We pull live prices for your market across major US sportsbooks.
  2. 2. We devig the consensus to estimate fair odds.
  3. 3. We compare your sportsbook's price to fair.
  4. 4. If the gap is positive, the bet has edge. If negative, you're paying a tax.

Worked example — a moneyline check

  1. 1
    Your price (FanDuel) Lakers ML +135
  2. 2
    Implied probability 42.6%
    What +135 says the chance is.
  3. 3
    Market consensus (devigged) +142
    Average fair price across 6 books.
  4. 4
    Fair probability 41.3%
  5. 5
    Edge −1.3%
    You're paying about 1.3% over fair. Pass.
+135 sounds great, but the rest of the market is pricing closer to +142. Once vig is removed, your price is slightly worse than fair — a small but consistent loser. The check takes 5 seconds and saves you from leaking edge one bet at a time.
Full analyzer
Slip Analyzer →
Per-leg A–F grades for any single or parlay.
Parlay
Analyze My Parlay →
Find the dead-weight leg dragging your slip down.
Math
Fair Odds Calculator →
Devig a two-way market to find the no-juice price.
Math
Implied Probability Calculator →
Convert any odds into a win-probability percentage.

Frequently asked questions

How do I know if a bet is worth placing?+

A bet is worth placing when the sportsbook's price is better than the true fair price — meaning the implied probability you're paying for is lower than the actual chance of the outcome. This gap is called edge, or expected value (EV). AiOddsLab measures it by removing the sportsbook's vig from the market consensus and comparing that fair price to your price.

What does 'fair odds' mean?+

Fair odds are the no-vig price — what the market would charge if the sportsbook took no cut. If a coin flip is priced −110 / −110, the fair price for each side is +100 (50% probability). Anything better than fair has positive expected value; anything worse has negative EV.

How much edge do I need for a bet to be 'worth it'?+

Sharp bettors generally target at least +2% edge after vig removal to overcome variance and the sportsbook's structural advantage. Anything +3% or higher is a strong play. Negative edge means you're paying more than fair value — over a large sample those bets lose.

Is a +EV bet guaranteed to win?+

No. A single +EV bet can lose. The math works over a large sample: bet enough +EV slips and you profit; bet enough −EV slips and you don't. Think of each grade as a measurement, not a prediction.

What about boosts, promos, and same-game parlays?+

All three carry hidden vig. A boost can still be −EV if it's not boosted enough. Same-game parlays are usually heavily juiced because legs are correlated. The analyzer prices them the same way: devig the market, find fair, compare your price.