1 in 2 means 1 successful outcome for every 2 chances.
Equivalent percentage
50.00%
50.00%
How rare is that?
This means the outcome happens, on average, once every 2 tries. Smaller percentages mean rarer events.
Probability calculator
Convert “1 in X” odds into a percentage.
1 in
Enter an odds value to convert it.
Frequently asked questions
What does 1 in 2 mean?
It means there are 1 successful outcomes in every 2 chances.
What percentage is 1 in 2?
1 in 2 is equal to 50%.
Does a smaller percentage mean a rarer event?
Yes. The smaller the percentage, the less often the event is expected to happen.