Betting Odds Converter & Parlay Calculator
Convert American, decimal, fractional and implied-probability odds, work out your payout, and price a multi-leg parlay — free, no account needed.
Odds converter & payout
- Decimal
- 2.500
- American
- +150
- Fractional
- 3/2
- Implied probability
- 40.0%
- Total return
- $250.00
- Profit
- $150.00
Parlay calculator
Add each leg in American odds. The combined odds and payout update automatically.
Combining 3 legs at these odds turns a $50.00 stake into $400.91 if every leg wins.
For information only — not betting advice. Odds and payouts are estimates based on the inputs above.
The odds formats, explained
- American (e.g. +150 / -110): how much you win on a $100 stake (positive) or how much you must stake to win $100 (negative).
- Decimal (e.g. 2.50): your total return per $1 staked, stake included. The easiest format for math and parlays.
- Fractional (e.g. 3/2): profit relative to stake, common in the UK and horse racing.
- Implied probability (e.g. 40%): the win chance the odds represent — useful for spotting value.
How parlays work
A parlay (or accumulator) combines several bets into one. Convert each leg to decimal odds, multiply them, and the product is your combined odds — so payouts grow fast, but every leg has to win. The calculator above does the multiplication for you.
Frequently asked questions
How do you convert American odds to decimal?
For positive American odds, divide by 100 and add 1 (e.g. +150 → 150/100 + 1 = 2.50). For negative American odds, divide 100 by the absolute value and add 1 (e.g. -110 → 100/110 + 1 ≈ 1.91).
What is implied probability?
Implied probability is the chance of an outcome that a set of odds represents. From decimal odds it is 1 ÷ decimal, expressed as a percentage (e.g. decimal 2.50 → 1/2.50 = 40%).
How are parlay odds calculated?
Convert each leg to decimal odds and multiply them together. The combined decimal odds times your stake equals the potential payout. Every leg must win for the parlay to pay.
How do you calculate a bet payout?
Multiply your stake by the decimal odds to get the total return; subtract the stake to get the profit. For example, a $100 stake at decimal 2.50 returns $250 (a $150 profit).
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