Bet Calculator: payout, profit and implied probability
Enter your odds and stake. See what you stand to win and the chance of winning those odds imply. Works with American, fractional and decimal odds, and converts between all three.
How does a bet calculator work?
A bet calculator turns betting odds and your stake into three numbers: the profit you make if the bet wins, the total payout (profit plus your stake back), and the implied probability, which is the win chance the odds represent.
Pick an odds format
Choose American, fractional or decimal, whichever your sportsbook shows.
Enter odds and stake
Results update as you type. Invalid odds are flagged with the allowed range.
Read the result
Compare profit and payout, then check the implied probability against your own estimate.
American, fractional and decimal odds compared
The same bet can be written three ways. This table shows common prices and a $100 stake.
| American | Fractional | Decimal | Implied probability | Profit on $100 |
|---|---|---|---|---|
| -200 | 1/2 | 1.50 | 66.67% | $50.00 |
| -110 | 10/11 | 1.91 | 52.38% | $90.91 |
| +100 | 1/1 | 2.00 | 50.00% | $100.00 |
| +150 | 3/2 | 2.50 | 40.00% | $150.00 |
| +250 | 5/2 | 3.50 | 28.57% | $250.00 |
| +500 | 5/1 | 6.00 | 16.67% | $500.00 |
Formulas
American: +X profit = stake × X ÷ 100, probability = 100 ÷ (X + 100). -X profit = stake × 100 ÷ X, probability = X ÷ (X + 100).
Fractional n/d: profit = stake × n ÷ d, probability = d ÷ (n + d).
Decimal D: profit = stake × (D − 1), probability = 1 ÷ D.
Frequently asked questions
What is implied probability in betting?
It is the chance of winning that the odds suggest. For decimal odds it is 1 divided by the odds, so 2.00 implies 50%.
How do I calculate profit from American odds?
For positive odds, profit = stake × odds ÷ 100. For negative odds, profit = stake × 100 ÷ the absolute odds. A $100 bet at +150 profits $150; at -150 it profits $66.67.
What is the difference between profit and payout?
Profit is what you win on top of your stake. Total payout is profit plus the stake you get back.
How do I convert fractional odds to decimal odds?
Divide the numerator by the denominator and add 1. Fractional 5/2 equals decimal 3.50.
Which odds does this calculator accept?
American odds must be -100 or lower, or +100 or higher. Fractional odds need a numerator and denominator between 1 and 100. Decimal odds must be greater than 1 and less than 100.
Play responsibly. This calculator is for information only and does not offer betting or financial advice. Gambling involves risk and you can lose money. If gambling is a problem, call 1-800-GAMBLER in the US.