Updated July 8, 2026. A American odds converter helps bettors translate prices into a format they can compare. PropsBot does not place bets. Use this page to understand the math behind the price before checking EV, line shopping, player props, or parlay payouts.
Quick Answer
An American odds converter changes plus and minus odds into decimal odds, fractional odds, and implied probability. PropsBot uses this conversion to help bettors compare sportsbook prices, calculate EV, and understand the break-even point before deciding whether a pick or prop still makes sense.
Formula
Positive American odds convert to decimal by dividing by 100 and adding 1. Negative American odds convert by dividing 100 by the absolute odds and adding 1. Implied probability is 100 / (positive odds + 100) for plus prices and absolute odds / (absolute odds + 100) for minus prices.
Example
At +150, decimal odds are 2.50 and implied probability is 40%. At -120, decimal odds are 1.83 and implied probability is about 54.5%.
Why Conversion Matters
Odds formats can make the same price feel different. American odds focus on risk and profit around $100. Decimal odds show total return. Fractional odds show profit relative to stake. Implied probability turns the price into a break-even percentage. Converting the odds keeps the bettor from comparing formats by feel.
This matters for PropsBot because the same workflow can include U.S. sportsbook odds, international soccer prices, tennis and golf markets, esports prices, player props, parlays, and EV checks. A clean conversion makes every later step easier.
How To Use This With PropsBot
Start with a pick or prop from picks today or player props today. Convert the price when the format is unclear. Then compare books with odds shopping, estimate expected value with EV betting calculator, and review implied probability with implied probability calculator.
For parlays, odds conversion is even more important because each leg gets multiplied in decimal form. Use the parlay calculator after converting prices so the payout math is clear before more legs are added.
Market Examples
In WNBA or NBA player props, converting odds helps compare prices across books when the line is the same. In KBO or MLB, it helps compare pitcher strikeout prices and moneylines. In tennis, soccer, PGA, CS2, League of Legends, and DOTA2, decimal pricing is common, so U.S. bettors often need a conversion before comparing the market with American odds.
Quick Reference Table
| American | Decimal | Implied Probability |
|---|---|---|
| +100 | 2.00 | 50.0% |
| +150 | 2.50 | 40.0% |
| +200 | 3.00 | 33.3% |
| -110 | 1.91 | 52.4% |
| -150 | 1.67 | 60.0% |
| -200 | 1.50 | 66.7% |
How To Read The Converted Price
The converted price does not say the bet is good. It tells you the hurdle. If the implied probability is 55%, your true estimate has to be higher than that before the price deserves attention. If the model estimate is lower, the conversion may save you from a weak bet even when the pick sounds right.
Always compare the converted price with the exact line. A basketball player over 7.5 rebounds at -110 is not the same bet as over 8.5 rebounds at +110. The conversion helps only when the market and line match the decision being reviewed.
Where Bettors Use This Most
Odds conversion is useful for player props, parlays, futures, soccer moneylines, tennis match bets, PGA outrights, esports maps, and any market where different books or sites show different formats. It is also useful when reading betting content from outside the United States, where decimal odds are common.
Mistakes To Avoid
- Comparing two prices without checking whether the line is the same.
- Using implied probability as if it removes sportsbook hold.
- Forgetting that decimal odds include stake in the return.
- Adding parlay legs before understanding each leg’s converted price.
- Using an old price after the market has moved.
Recalculate When The Market Moves
Recalculate whenever the price changes. Moving from -110 to -130 changes the break-even point. Moving from +150 to +120 changes the payout and implied probability. In player props, the line can also move, which means the conversion needs to be reviewed with the new number, not just the new odds.
Sport Examples
For WNBA assists, conversion helps compare the same prop across books. For KBO strikeouts, it helps separate pitcher line movement from price movement. For UFC method bets, it shows how much probability the market assigns to a finish or decision. For soccer and tennis, it helps U.S. bettors translate decimal prices into American odds before comparing picks. For esports, it helps compare map and series prices across formats.
Related Tools
Bottom Line
A American odds converter keeps the price understandable. Use it before EV math, odds shopping, parlay building, or player prop comparison so the betting decision starts from the right number.
