Betting Odds Converter
Convert American, decimal, and fractional betting odds into a single clean readout: implied probability, breakeven rate, profit, payout, and what the line is really asking you to beat.
Free Betting Odds Converter
Enter one price. The calculator translates it to every major format and shows the probability hidden inside the line.
Use negative prices for favorites and positive prices for underdogs.
Enter valid American odds outside the -100 to +100 range.
Decimal odds must be greater than 1.00.
Enter valid decimal odds greater than 1.00.
Use numerator/denominator format, such as 5/2 or 10/11.
Enter valid fractional odds in numerator/denominator format.
Optional. Used for profit and payout math.
Odds conversion is not just formatting. It is the first edge check.
A sportsbook line is a probability wearing a price tag. This calculator strips the format away so you can see the number that matters: the win rate required to break even. If a bet is priced at -110, the market is asking you to clear 52.38%. If your research says the true probability is only 51%, the bet is not cheap. If your estimate is 56%, now you have something worth testing with expected value math.
1.909 decimal, 10/11 fractional, 52.38% implied.
2.50 decimal, 3/2 fractional, 40.00% implied.
A lower breakeven rate means the same opinion needs fewer wins.
How to convert betting odds
Positive prices
Decimal odds = American odds / 100 + 1. A +150 underdog becomes 2.50 decimal.
Negative prices
Decimal odds = 100 / absolute American odds + 1. A -110 favorite becomes 1.909 decimal.
The clean bridge
Implied probability = 1 / decimal odds. A 2.50 price implies 40.00% probability.
Negative American: |odds| / (|odds| + 100)
Decimal: 1 / decimal odds
Fractional: denominator / (numerator + denominator)
Popular betting odds conversions
These are the prices bettors check constantly when comparing spreads, totals, moneylines, props, futures, and international books.
| American | Decimal | Fractional | Implied probability | Read |
|---|---|---|---|---|
| -500 | 1.20 | 1/5 | 83.33% | Huge favorite |
| -300 | 1.33 | 1/3 | 75.00% | Heavy favorite |
| -200 | 1.50 | 1/2 | 66.67% | Strong favorite |
| -150 | 1.67 | 2/3 | 60.00% | Moderate favorite |
| -110 | 1.91 | 10/11 | 52.38% | Standard spread price |
| +100 | 2.00 | 1/1 | 50.00% | Even money |
| +120 | 2.20 | 6/5 | 45.45% | Small underdog |
| +150 | 2.50 | 3/2 | 40.00% | Medium underdog |
| +200 | 3.00 | 2/1 | 33.33% | Two to one payout |
| +500 | 6.00 | 5/1 | 16.67% | Long shot |
American, decimal, and fractional odds explained
American odds
Negative numbers show how much you risk to win $100. Positive numbers show how much you profit on a $100 bet.
Decimal odds
Decimal odds show total return per dollar staked. Multiply stake by decimal odds to calculate total payout.
Fractional odds
Fractional odds show profit relative to stake. A 5/2 line means you profit $5 for every $2 risked.
Use this converter for line shopping
Line shopping is one of the cleanest ways to improve your betting results because it changes the price without changing the pick. Getting -105 instead of -110 does not require you to predict games better. It simply lowers the win rate you need to break even.
52.38% breakeven
51.22% breakeven
The same bet needs fewer wins at the lower hold price.
For live odds comparison across 18 sportsbooks, Juice can scan a bet and show which book has the best available price. Use this converter when you want the raw math behind the price.
If you are comparing full products instead of checking one line, use our guide to the best sports betting research apps to see which tools combine odds comparison, EV analysis, prop research, and bet tracking.
Betting odds converter FAQ
What is the best odds format for betting math?
Decimal odds are the easiest format for betting math. Implied probability is 1 divided by decimal odds, and total payout is stake multiplied by decimal odds.
Is implied probability the same as true probability?
No. Implied probability is what the sportsbook price says after including margin. True probability is your estimate of the actual chance an outcome wins. Betting edge comes from the gap between those two numbers.
What does -110 mean in betting?
A -110 line means you risk $110 to win $100 in profit. It converts to 1.909 decimal odds, 10/11 fractional odds, and 52.38% implied probability.
What does +150 mean in betting?
A +150 line means a $100 bet wins $150 in profit. It converts to 2.50 decimal odds, 3/2 fractional odds, and 40.00% implied probability.
What should I do after converting odds?
Compare the implied probability to your true probability estimate. If your estimate is higher, check the exact expected value with the EV Calculator. If the bet is positive EV, size it with the Kelly Criterion Calculator.