Odds compiling is the process of setting and adjusting the prices a sportsbook offers, combining statistical models, trader judgement, market signals, and risk limits.
Odds Compiling
TL;DR: Odds compiling is the process of setting and adjusting the prices a sportsbook offers, combining statistical models, trader judgement, market signals, and risk limits.
What it means
Modern odds compiling is a hybrid of model-driven and trader-driven work. Quant models (often vendor-supplied by Sportradar, Genius Sports, Stats Perform, or proprietary) output a fair probability, then traders apply margin (vig), set limits, and react to incoming bets, sharp-action alerts, and competitor moves.
Pre-match compiling sets opening prices days or hours before kick-off. In-play compiling reprices every few seconds based on game state, momentum, and incoming action. The trader's job is increasingly about exception handling, market construction, and risk policy rather than line setting by hand.
Formula / How it's measured
Not a single formula. Mechanism: True probability p → fair odds 1/p → add margin → posted odds. For a two-way market with true probs (0.55, 0.45) and 4% margin: posted decimal odds 1/(0.55×1.04)=1.748 vs 1/(0.45×1.04)=2.137.
Example: a Champions League final fair model: Real Madrid 0.58, Borussia Dortmund 0.42, with 4.5% overround. Posted odds: 1.65 RM / 2.28 BVB. After Madrid takes 70% of pre-match handle at 1.65, line shaves to 1.62 / 2.34. Compiling discipline is when and how much to move.
Why it matters for operators
Compiling quality is the difference between a profitable book and a charity. Bad compiling — slow moves, large priced exotics, anchored at competitor prices — bleeds margin to sharps. Good compiling pulls margin from recreational mix while limiting exposure to sharp money.
Common benchmarks (2026)
- Vendors: Sportradar MTS, Genius Sports, Betgenius, Stats Perform; in-house at top operators
- Margins: football 3%–6%, niche 6%–12%
- In-play update frequency: 1–5 seconds per market
- Markets per match (top football): 200–800
- Trader-to-events ratio modernised: 1 trader per 30–60 simultaneous events
Common mistakes
- Copying competitor lines without independent fair-value check
- Slow reaction to sharp money — letting steam runs hit you
- Over-priced longshots without limits — single accumulator can crater P&L
See also