Parlay EV Calculator
Enter the price the book is offering for the whole parlay and your estimate of the chance it wins. Add a stake only if you want a dollar figure — EV% does not depend on it.
Your estimate of the chance the parlay wins.
Estimated EV is a long-run average, not a prediction about a single bet. Positive expected value means the offered price is favorable relative to the probability you entered — it does not guarantee the wager will win. This calculator is a math tool, not a prediction tool.
Example
A book offers +600 on a parlay. That price implies a 1 ÷ 7.00 ≈ 14.3% chance of winning.
If your estimated fair probability is 17%, the estimated EV is about 0.17 × 7.00 − 1 = +19% of stake — roughly +$1.90 per $10 over the long run. Any single ticket can still lose.
What the results mean
- Probability implied by the price
- The break-even win chance baked into the sportsbook's offered odds, including its margin.
- Estimated fair odds
- The no-margin price that corresponds to the probability you entered.
- Estimated EV
- The long-run average return per dollar staked if your probability estimate is accurate. Positive means the offered price is favorable relative to your estimate — not that the bet will win.
- Estimated EV on this stake
- Estimated EV expressed in dollars for the stake you entered. Shown only when a stake is provided.
Frequently asked questions
Keep reading
- What expected value means — reading a +EV or -EV number honestly
- Why +EV is not a guarantee — expected value is a long-run average
- Evaluate a real parlay — run your actual ticket through EVScout
Want EVScout to estimate fair probabilities from current sportsbook markets?
No picks. No locks. No hype. Just the math.