Football Totals: Goals Modelling Basics

## The Expected Goals Foundation Football totals betting is most profitably approached through an expected goals (xG) framework. Your over/under estimate should come from your model of total expected goals in the match, not from gut feeling or recent results alone. ## Building a Simple Goals Model **Step 1:** Calculate each team's average xG scored and xG conceded per match over the last 15 matches (opponent-adjusted). **Step 2:** Estimate total expected goals for the upcoming match: Expected Goals = (Home team avg xG scored + Away team avg xG conceded) / 2 + (Away team avg xG scored + Home team avg xG conceded) / 2 This produces a single expected total xG for the match. **Step 3:** Apply the Poisson distribution to derive the probability of each total goals outcome from 0 to 7+. **Step 4:** Calculate the probability of Over and Under for any line. ## Contextual Adjustments for Goals Beyond team xG, adjust for: - **Referee:** Top-quartile card-happy referees also tend to allow fewer goals (more stoppages) - **Weather:** Rain and wind suppress goals by approximately 0.1–0.2 per match - **Motivation:** A match with nothing at stake (mid-table clash, last day of season) sometimes sees more carefree attacking play - **Tactical matchup:** Two high-press, counter-attack teams facing each other may produce lower xG than their individual averages suggest ## The Over/Under Margin Totals markets typically carry slightly higher margins than 1X2 in football — around 5–7% at standard bookmakers. Target Pinnacle or exchanges where totals margins fall to 2–3%.