Definition
A correlated parlay is a parlay with legs whose outcomes are statistically linked. If one leg wins, another leg becomes more likely to win too. Standard parlay pricing multiplies each leg’s decimal odds as if the events are independent:
parlay decimal odds = leg 1 decimal odds × leg 2 decimal odds × ...
That formula is accurate only when the legs are priced independently. Correlation changes the true probability of the combined outcome, so the listed payout can be too high or too low relative to the real chance of winning.
Worked Example
A bettor pairs Team A moneyline at -110 with Team A over 24.5 points at -110. Each -110 leg has decimal odds of 1.9091.
Using standard parlay math:
1.9091 × 1.9091 = 3.6447
A $100 bet would return about $364.47, including the original stake, for a profit of about $264.47.
The legs are linked because Team A winning often depends on Team A scoring enough points. If Team A scores 31, both legs are more likely to cash together than two unrelated -110 bets.
Why It Matters
Correlated parlays help a bettor spot when a combined price does not match the true relationship between the legs. The concept is most useful when comparing same-game combinations, team totals, spreads, moneylines, and player props that move together.