What is an odds calculator?
An odds calculator is a must-have tool for any sports bettor. It lets you quickly convert betting odds between formats — American, decimal and fractional — and instantly calculate your potential return and net profit based on your stake.
Different countries use different types of odds:
- 🇺🇸 American odds (e.g. +150 or -200) are standard in the United States.
- 🇪🇺 Decimal odds (e.g. 2.50) are common across Europe and at online sportsbooks.
- 🇬🇧 Fractional odds (e.g. 5/2 or 4/5) are traditional in the UK and Ireland.
Whether you’re comparing bets across different platforms or tipsters — or just want to understand how much you stand to win — this tool saves you time and ensures accuracy.
Use our odds calculator to convert and calculate instantly
Our odds calculator does the heavy lifting for you. Enter your odds in any format and your stake, and you’ll see:
- 🔁 The converted odds in all three major formats
- 💰 Your total payout
- ✅ Your net profit and the implied probability
It’s fast, free and built for beginners and experienced bettors who want clean, instant answers.
How to convert betting odds
American → decimal: 100 ÷ |odds| + 1 (-200 → 1.50)
Fractional → decimal: numerator ÷ denominator + 1 (3/2 → 2.50)
Implied probability = 1 ÷ decimal odds (2.50 → 40%)
Payout = stake × decimal odds · Profit = payout − stake
Straight odds vs. parlay odds
Wondering whether this tool works for single picks and parlays? It does. Here’s the difference between the two:
✅ Straight odds
A straight bet is a single wager on one outcome. The odds calculator instantly shows your return based on your stake and the odds you enter — perfect for moneylines, spreads and over/unders.
🔗 Parlay odds
A parlay combines two or more picks into one bet. Use our parlay calculator to stack multiple selections, then compare the combined odds here. With both tools working together, you can break down complex parlays or simple straight picks in seconds.
