Free calculator

Odds Converter

Enter odds in any format — American, decimal or fractional — and this converter shows the equivalent in every other format plus the implied probability the price is charging you.

American oddsUse −110 or +250. Minimum magnitude 100.

Decimal1.909

Fractional (approx)0.91 / 1

Implied probability52.38%

Profit on $100$90.91

How to use it

Change any input and the results update immediately. The values are also written into the address bar, so you can bookmark a calculation or paste the link to someone else and they will see exactly the same numbers.

Everything here computes with the same functions that produce the grades inside WeBall, so a number on this page will never contradict a number on a bet card.

What the term means

The +/− format used in the US, showing profit on a $100 stake or the stake needed to win $100.

Positive odds show the profit on a $100 bet: +250 wins $250. Negative odds show what must be risked to win $100: −150 risks $150. Even money is +100 or −100.

Full definition of american odds →

Learn the math behind it

A calculator is faster than doing this by hand, but knowing why the formula works is what lets you spot when a number is wrong. Read the full guide →

Related calculators

Implied Probability Calculator