Type in the odds. See what it pays.
Put in a price and how much you want to bet, and this tells you what comes back if it wins, how much of that is profit, and what chance the price is really asking for. It reads American, decimal, and fractional odds, and it converts between all three, so it does not matter which one is on your screen.
Use a minus for favorites and a plus for underdogs, for example -110 or +150.
Total payout
Profit if it wins
Implied probability
American
Decimal
Fractional
Three answers from one price
Every price is doing three jobs at once, and the calculator separates them out. The total payout is everything that lands back in your account if the bet wins, which includes the money you put up. The profit is just the winnings on top. The implied probability is the win rate the price needs before it starts paying for itself.
Take a 100 dollar bet at +150. The profit is 150 dollars, the payout is 250 dollars, and the implied probability is 40 percent. All three describe the same wager. Which one you care about depends on whether you are asking what you win, what you get back, or how likely this needs to be.
Minus is the favorite, plus is the underdog
In American odds, a minus number tells you what you have to risk to win 100 dollars. At -200 you risk 200 to win 100. A plus number tells you what you win from a 100 dollar bet. At +200 you risk 100 to win 200. The further a number sits from 100 in either direction, the more lopsided the matchup.
Decimal odds say the same thing in one number: multiply your bet by it and you get the total payout, stake included. Fractional odds give the profit against the stake, so 10/11 means eleven risked to win ten. None of the three carries information the others lack, and how to read betting odds walks through the conversions if you want them by hand.
Profit and payout are not the same number
This trips up nearly everyone at some point. A bet slip that says you will win 150 dollars and a calculator that says the payout is 250 dollars are not disagreeing. One is counting the winnings and the other is counting the winnings plus the 100 dollars you already had in the bet. The calculator above shows both on purpose, so there is nothing to guess at.
One more thing worth knowing before you lean on the probability figure. Every price a sportsbook posts has its margin built in, which nudges the implied probability higher than the market's honest estimate of the outcome. It is still the right number to hold your own opinion against, and what is juice explains where that extra bit comes from.
Odds and payouts, answered
What does an odds calculator do?
It turns a price and a bet amount into the two numbers you actually want: what the wager pays if it wins, and how much of that is profit. It also converts the price into American, decimal, and fractional form, so a number you do not recognise stops being a barrier.
What does -110 mean?
A price of -110 means you risk 110 to win 100. Betting 100 dollars at -110 wins about 90.91 dollars in profit and returns about 190.91 in total. Minus prices are favorites, and the bigger the number after the minus, the more you have to risk for the same win.
What does +150 mean?
A price of +150 means a 100 dollar bet wins 150 dollars in profit and returns 250 in total. Plus prices are underdogs, and the bigger the number, the less likely the market thinks that outcome is and the more it pays if it happens.
Is the payout the same as the profit?
No, and this is the single most common mix-up. The profit is what you win on top of your bet. The payout is the profit plus your original bet coming back to you. A winning 100 dollar bet at +150 shows a 150 dollar profit and a 250 dollar payout, and both figures are correct.
How do you convert American odds to decimal?
For a plus price, divide it by 100 and add one, so +150 becomes 2.50. For a minus price, divide 100 by the number without its sign and add one, so -110 becomes 1.91. The calculator above does it for you in both directions, along with fractional.
What is implied probability?
It is the win rate a price needs before it pays for itself, and it is simply one divided by the decimal odds. A price of -110 implies 52.4 percent, which is why breaking even at standard odds takes more than half your bets.
Does implied probability tell me the real chance of winning?
Not quite. Every posted price has the sportsbook's margin built into it, which pushes the implied probability above the market's honest estimate. It is still the right number to compare your own opinion against, but treat it as the price's demand rather than as the truth.
Is this calculator free to use?
Yes. There is no sign-in, no limit on how many times you can use it, and it works the same way for football, basketball, baseball, or anything else priced in the formats above.
Now find out which prices are worth taking
This calculator tells you what a price pays. Our boards put a model number next to that price on every game we cover, so you can see where the two disagree.