Moneyline Odds Calculator

Convert American moneyline odds (like +150 or -200) into implied win probability, decimal and fractional odds, and the exact profit and payout on your stake.

Quick Facts

Method
Exact American-odds conversion, no vig removed
Positive odds: implied % = 100/(odds+100). Negative odds: implied % = |odds|/(|odds|+100).

Your Results

Calculated
Implied win probability
-
Break-even chance priced in
Decimal odds
-
Total return per $1 staked
Profit on stake
-
Winnings if the bet hits
Total payout
-
Stake returned plus profit

Ready

Enter a moneyline (e.g. +150 or -200) and your stake, then calculate.

How the Moneyline Odds Calculator works

American moneyline odds are the way U.S. sportsbooks quote a bet. They are always centered on $100. A positive number (like +150) is an underdog and tells you the profit on a $100 wager. A negative number (like -200) is a favorite and tells you how much you must risk to profit $100. This calculator takes any moneyline and your stake, then converts it into the four numbers that actually matter: implied win probability, decimal odds, profit, and total payout.

The exact formulas

For positive odds (+M, the underdog):

  • Implied probability = 100 / (M + 100)
  • Decimal odds = (M / 100) + 1
  • Profit on a stake S = S × (M / 100)

For negative odds (−M, the favorite), where M is the absolute value:

  • Implied probability = M / (M + 100)
  • Decimal odds = (100 / M) + 1
  • Profit on a stake S = S × (100 / M)

Total payout is always the stake plus the profit (stake × decimal odds). For example, +150 with a $100 stake gives implied probability 100/250 = 40%, decimal odds 2.50, profit of $150, and a total payout of $250. A −200 line with a $100 stake gives implied probability 200/300 = 66.67%, decimal odds 1.50, profit of $50, and a $150 payout.

Why implied probability matters

The implied probability is the break-even win rate the price demands. If a book prices a team at -150, you need to win that bet about 60% of the time just to break even over the long run (150 / 250 = 60%). If you believe the true chance is higher than the implied probability, the bet has positive expected value; if it is lower, the book has the edge. Note that the implied probabilities on both sides of a real market add up to more than 100% — the excess is the sportsbook's margin, called the "vig" or "juice." This calculator reports the raw implied probability and does not strip out the vig.

Common reference points

  • +100 (even money) = 50.00% implied, 2.00 decimal, doubles your stake on a win.
  • -110 (the standard spread/total price) = 52.38% implied, 1.909 decimal; a $110 bet profits $100.
  • +200 = 33.33% implied, 3.00 decimal; a $100 bet profits $200.
  • -500 (heavy favorite) = 83.33% implied, 1.20 decimal; you risk $500 to win $100.

Frequently Asked Questions

What does a +150 moneyline mean?
A +150 line is an underdog price. A winning $100 bet profits $150 (total return $250). Its implied win probability is 100 / (150 + 100) = 40%, and it equals decimal odds of 2.50 or fractional odds of 3/2.
What does a -200 moneyline mean?
A -200 line is a favorite price: you risk $200 to profit $100. A winning $100 bet profits $50 (total return $150). Its implied win probability is 200 / (200 + 100) = 66.67%, equal to decimal odds of 1.50 or fractional odds of 1/2.
Why do the two sides add up to more than 100%?
The sum of both teams' implied probabilities exceeds 100% because the sportsbook builds in a margin (the vig or juice). For a -110/-110 market, each side implies 52.38%, totaling about 104.76%. That extra 4.76% is the book's built-in edge, which is why you should shop for the best line.
How do I convert a moneyline to decimal odds?
For positive odds: decimal = (odds / 100) + 1, so +150 becomes 2.50. For negative odds: decimal = (100 / |odds|) + 1, so -200 becomes 1.50. Decimal odds represent the total return per $1 staked, including your original stake.

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