Edge Score in Sports Betting: Modeled vs Implied Probability Explained
Short answer: The Edge Score is the percentage-point gap between PropsBot’s modeled probability and the sportsbook’s implied probability for a given player prop.
If PropsBot’s models say a player has a 60% chance of going Over 4.5 rebounds, and the sportsbook is offering -130 (implied probability 56.5%), the Edge Score is 3.5 points. Positive Edge means the sportsbook line is mispriced in your favor — that is the definition of +EV (positive expected value). Negative Edge means the sportsbook is overpricing the bet against you — pass.
What is an Edge Score?
In simple terms: The Edge Score is the percentage-point gap between PropsBot’s modeled probability and the sportsbook’s implied probability for a given player prop. If PropsBot’s models say a player has a 60% chance of going Over 4.5 rebounds, and the sportsbook is offering -130 (implied probability 56.5%), the Edge Score is 3.5 points. Positive Edge means the sportsbook line is mispriced in your favor — that is the definition of +EV (positive expected value). Negative Edge means the sportsbook is overpricing the bet against you — pass.
How it is calculated
- Formula: modeled probability minus sportsbook implied probability, expressed as percentage points
- Implied probability: derived from the sportsbook odds: for -130 it is 130/(130+100) = 56.5%
- Positive Edge (+): PropsBot models predict the bet hits MORE often than the sportsbook prices in — this is a +EV bet
- Negative Edge (–): PropsBot models predict the bet hits LESS often than the sportsbook prices in — pass
- Sharp threshold: Edge of 2-3 points typically clears the sportsbook hold (4-5% on most prop markets); 5+ Edge is a strong play; 8+ Edge is rare and aggressive
Where you see this stat in PropsBot
PropsBot surfaces this metric on:
- Every published daily pick (e.g., “Spencer Strider Over 7.5 Ks — 6.2% Edge”)
- /best-props-today/ feed, sortable by Edge
- iOS and Android live odds + Edge tickers across DK, FanDuel, BetMGM, and Caesars
- Pick history on player archive pages (/players/[slug]/) showing post-game Edge accuracy
How PropsBot uses this metric
PropsBot computes Edge Score by comparing the modeled outcome probability to the live sportsbook implied probability across multiple books simultaneously. If FanDuel posts -130 and BetMGM posts -120 for the same line, the Edge calculation uses the BEST available price (BetMGM at -120 = 54.5% implied), maximizing the surface for +EV plays.
Public track record: PropsBot’s 31.7% verified MLB ROI (101,881 graded picks) and 27.8% NBA ROI (218,826 graded picks) are built primarily on Edge — most published picks have 4-8 points of positive Edge at the line listed. NHL picks: 26.1% ROI across 18,243 graded picks.
Edge is the more important metric of the two PropsBot scores. Confidence tells you “do the models agree?” Edge tells you “is the price wrong?” You can win with high Confidence + small Edge over a large sample, but a single pick needs Edge to be +EV at the closing line.
Frequently Asked Questions
What is the difference between Edge Score and +EV?
They are the same concept expressed differently. +EV (positive expected value) is what bettors call any wager where the modeled probability exceeds the sportsbook implied probability. Edge Score is the magnitude of that difference, in percentage points. A 5% Edge is exactly equivalent to a +EV bet at +5%.
How much Edge do I need to beat the sportsbook hold?
Most prop markets have a 4-5% sportsbook hold (the spread between Over and Under implied probabilities exceeding 100%). To overcome that hold, your average bet needs at least 2-3 points of Edge. Sharp pros typically bet only 5%+ Edge plays where the math is clearly in their favor.
What does negative Edge mean?
Negative Edge means the sportsbook is offering a price that overstates the true probability — you would lose money long-term if you bet at that line. PropsBot’s daily-pick feed filters out negative-Edge picks; we only publish positive-Edge plays.
How is Edge calculated if the sportsbook changes the line?
PropsBot tracks line movement across DraftKings, FanDuel, BetMGM, and Caesars in real time. Edge is recalculated continuously on the iOS and Android apps as books move their lines. The daily-pick blog posts snapshot Edge at publication time; if the line moves after publication, log into the app to see current Edge.
Is Edge Score the same as Closing Line Value (CLV)?
Related but different. CLV measures how much better your bet was than the line at game start. Edge measures how much better your bet is than the line RIGHT NOW versus the model. Persistent positive CLV is the gold standard for evaluating sharp betting; PropsBot’s daily picks regularly beat the closing line, which is why the long-term ROI numbers hold up.
