American odds to decimal odds
A positive number is the profit per 100 staked; a negative number is the stake needed to win 100. Enter it with its sign to see the other formats.
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How to use it
- Enter american odds.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
If A is positive: decimal = 1 + A/100 and probability = 100 ÷ (A + 100). If negative: decimal = 1 + 100/|A| and probability = |A| ÷ (|A| + 100).
Example
Inputs: American odds = -110. Result: Decimal odds: 1.9091; Implied probability: 52.381%.
Limits and caveats
- Values between −100 and +100 are not valid American odds, so the tool rejects them.
- Implied probability includes the margin of whoever set the price.
Questions about this tool
What does −110 mean?
Stake 110 to win 100, which is about 1.91 in decimal and 10/11 in fractional odds.
What does +250 mean?
Win 250 for every 100 staked, which is 3.50 decimal and 5/2 fractional.
Are +100 and −100 the same?
Yes. Both mean profit equal to the stake: 2.00 in decimal and a 50% implied probability.