Convert odds, build parlays, work out payouts and find value. Instantly, in your browser, no signup.
Convert between American, decimal, fractional and implied probability instantly.
Open → 🧮Combine 2 or more legs and get the parlay odds, the payout and the profit.
Open → 💵Odds + stake → total payout and net profit. American or decimal.
Open → 📈Compare the offered odds with your estimated probability and spot bets with value.
Open →These tools help you read odds and make better decisions. The converter translates any odds format; the parlay calculator combines legs; the payout one shows what a bet would return; and the expected value one tells you whether a bet is worth it over the long run.
The four tools are the same arithmetic seen from different angles, and decimal odds are the hinge: the converter gets you there from any format, the payout calculator multiplies them by your stake, the parlay calculator multiplies several together, and the expected value one compares them with your own probability. Understand decimal and you understand all four.
Something books don't advertise: the implied probabilities of both sides of a market add up to more than 100%. In a game priced at ‑110 a side, each side implies 52.38%, and the two together 104.76%. That extra 4.76% is the book's margin, and it's why winning half your bets doesn't leave you flat: at ‑110 break-even sits at 52.38%, not 50%.
None of these calculators predicts a result. They convert, multiply and compare numbers you type in; expected value in particular is only as good as the probability you feed it. They tell you what you're being offered, not what is going to happen.
They all run in your browser, with no signup and without sending your data anywhere. Informational only. 18+.