Streamlined Probability Calculator
A clean, easy tool for two common probability calculations:
1. Probability of at least one success in multiple attempts
2. Convert fractional odds to percentage probability
At Least Once Probability
Calculates the probability of getting a certain outcome at least once within a set number of attempts.
Example: The chance of rolling a 6 on a single die is 1/6 ≈ 16.67%. For 10 rolls, the chance of rolling at least one 6 is much higher.
Fractional Odds to Percentage
Converts one or multiple fractional odds into overall probability.
Example: Probability of rolling a 3 on a regular die is 1/6 = 16.67%. For a 1/2 chance followed by a 1/24 chance, the overall chance is 1/2 × 1/24 = 1/48 = 2.08%.
This tool helps you figure out how likely something is to happen when you know the chances of smaller things happening.
Imagine:
- Rolling a dice with 6 sides — the chance of getting a 3 is 1 out of 6, or about 17%.
- Now, imagine you have two things that must happen one after the other:
- First, something with a 1 out of 2 chance (like flipping a coin and getting heads), AND THEN
- Something with a 1 out of 24 chance (like picking a special marble from a big bag).
You need to multiply the chances:
- 1/2 × 1/24 = 1/48, or about 2%.
So, the more rare events you stack together, the smaller the chance becomes!
This tool helps you figure out how likely it is to get what you want at least one time when you try many times.
Imagine:
- Rolling a dice with 6 sides — the chance of getting a 3 is about 17% in one roll.
- But if you roll the dice 25 times, it’s much more likely that you’ll get a 3 at least once — almost 99%!
The more times you try, the better your chances of getting what you want at least one time!