calculator
Parlay Calculator
Add legs (American odds) and instantly see combined odds, implied probability, payout, and profit.
Build your parlay
Enter a stake and add legs. Use + and - American odds (ex: -110, +150).
Combined American: —
Combined Decimal: —
Implied probability: —
Payout: —
Profit: —
Why parlays feel “fun” but are dangerous
The book loves parlays because compounding probability is brutal.
Each added leg multiplies the chance of losing. Even “safe” legs stack into a much lower hit rate than most people realize. This calculator keeps you honest by showing the true implied probability and payout math.
- Use it to compare payout vs realistic hit rate
- Don’t “chase” with bigger stakes — keep unit sizing consistent
- Parlays can be fine, but they should be intentional
Mini FAQ
Is implied probability exact? It’s based on the posted odds (includes vig).
Can I add 10 legs? You can — but you probably shouldn’t.