Betting odds calculator
Odds Converter: Decimal, Fractional and American
Convert betting odds between decimal, fractional and American formats.
It is handy when you compare prices across international bookmakers
or come across odds written in a format you rarely use.
The calculator also shows the implied probability, so you can see
what the price actually means in mathematical terms.
Convert odds to another format
Pick the input format and enter the odds. You get the decimal, fractional
and American equivalents plus the implied probability straight away.
Enter odds in any format
Choose the format you have: decimal, fractional or American. The converter turns it into the other two formats and shows the implied probability.
Your odds in every format
Reading decimal odds
Reading fractional odds
Probability
The three odds formats
Decimal odds
The simplest format for most bettors: 1.50, 2.00, 2.50, 4.00.
The return is your stake multiplied by the odds.
Fractional odds
The traditional British format: 1/2, 1/1, 3/2, 5/1.
The fraction shows net profit relative to the stake. For example, 3/2 means
a stake of 2 units wins 3 units of profit.
American odds
Used in the US: +150, -200, +300. A plus price shows the profit
on a 100 stake. A minus price shows how much you need to stake to win 100 profit.
Odds conversion examples
| Decimal | Fractional | American | Implied probability | Comment |
|---|---|---|---|---|
| 1.50 | 1/2 | -200 | 66.67% | Favourite: low return, high implied probability. |
| 2.00 | 1/1 | +100 | 50.00% | Evens: a 100 stake wins 100 net profit. |
| 2.50 | 3/2 | +150 | 40.00% | Mid-range price, profit larger than the stake. |
| 4.00 | 3/1 | +300 | 25.00% | Underdog: high return, low implied probability. |
How to read the result
Decimal odds
Multiply the stake by the odds. A 100 stake at 2.50 returns
250, which is 150 net profit.
Fractional odds
The fraction is profit relative to the stake. At 3/2,
a stake of 2 wins 3 profit, so the total return is 5.
American odds
+150 means 150 profit on a 100 stake. -200 means you have to stake 200
to win 100 net profit.
Related calculators
Once the odds are converted, you can work out the payout on a bet, check the
implied probability in more detail or browse the full set of tools.
Frequently asked questions
Which odds format is the easiest?
For most bettors it is decimal odds: the return is simply the stake
multiplied by the odds.
What do American odds of +150 mean?
A 100 stake wins 150 net profit if the bet comes in.
In decimal format that is 2.50.
What do American odds of -200 mean?
You need to stake 200 to win 100 net profit.
In decimal format that is 1.50.
Does the converter predict how likely an outcome is?
No. It shows the probability built into the price mathematically.
That is not a sports prediction and not a guarantee of any result.
Before placing a bet, check the actual return, the market rules and any limits, not only the format.