Slip Analyzer
Paste any sportsbook bet — single or parlay — or upload a screenshot. We strip the vig, find the fair price, and grade every leg A through F with edge %, expected value, and a plain-English verdict.
How the slip analyzer works
- 1. Parse the slip. We OCR your screenshot or read your pasted text to pull every leg, team, market, and price.
- 2. Pull live market prices. For each leg we fetch current prices across major US sportsbooks (DraftKings, FanDuel, BetMGM, Caesars, ESPN BET, Fanatics, and more).
- 3. Remove the vig. We devig the two-sided market to find the fair, no-juice probability for each side.
- 4. Grade it. Your sportsbook's price gets compared to the fair price. The gap, expressed as edge %, drives the A–F grade.
Worked example — a 3-leg NFL parlay
- 1Leg 1 — Bills −3.5 −110 (fair: −105)Edge: −2.4% — slightly worse than market.
- 2Leg 2 — Mahomes 275+ pass yds +150 (fair: +118)Edge: +6.4% — graded A.
- 3Leg 3 — Chiefs/Ravens Over 47.5 −110 (fair: −108)Edge: −1.0% — graded C.
- 4Blended slip edge: +2.6%
- 5Slip grade: B+Leg 2 is doing the heavy lifting; legs 1 and 3 are dragging.
Why grade a bet slip before placing it?
Sportsbooks bake a margin — the vig — into every line. A typical −110 / −110 market carries about 4.5% hold. That hold compounds across parlay legs, which is why 5-leg parlays often carry 20%+ built-in margin against you. The bet slip analyzer removes that margin to show you what the bet is actually worth, so you can stop guessing and start measuring.
The grade isn't a prediction. It's a measurement: given current market consensus, is this price better or worse than fair? Bet enough +EV slips and you win long-term. Bet enough −EV slips and you don't.
Frequently asked questions
What is a slip analyzer?+
A slip analyzer takes a sportsbook bet — either a single wager or a multi-leg parlay — and grades each leg against live market consensus. It strips the sportsbook's vig to estimate fair odds, then tells you whether your price beats the market (positive expected value) or trails it.
How does AiOddsLab's slip analyzer work?+
Paste your bet text or upload a screenshot. We OCR the legs, match each one to the live market across major US sportsbooks, devig the consensus to get a fair price, and compare your sportsbook's price to fair. The output is an A–F grade per leg, edge %, EV per $100, and a plain-English verdict.
Is the slip analyzer free?+
Yes — no signup, no paywall, no limit. Every tool on AiOddsLab is free: slip analyzer, parlay calculator, fair odds calculator, EV calculator, odds converter, and implied probability calculator.
What's the difference between the slip analyzer and the parlay calculator?+
The parlay calculator does the math: combined odds, payout, win probability. The slip analyzer does the grading: it compares your sportsbook's price to the true market price and tells you whether the parlay is +EV or trash.
Can the analyzer read a screenshot of my bet slip?+
Yes. Upload a screenshot from DraftKings, FanDuel, BetMGM, Caesars, ESPN BET, Fanatics, or any major US book. The OCR pulls legs and odds automatically — then the grading runs on the parsed slip.
What does an 'A' grade mean on a bet slip?+
An A grade means your sportsbook is offering a price meaningfully better than the devigged market consensus — typically +3% edge or more after vig is removed. Over a large sample, A-graded bets are profitable on average. It's not a guarantee any single bet wins.