Probability Calculator
Calculate basic probability, binomial distributions, and dice roll probabilities.
50.0000%
Probability
3 / 6
As Fraction
0.500000
As Decimal
50.0000%
Complement
3 : 3
Odds For
3 : 3
Odds Against
About This Tool
The Probability Calculator computes basic probabilities, binomial distributions, and dice sum distributions. Enter favorable and total outcomes to instantly see probability, fraction, decimal, complement, and odds.
The Binomial tab calculates the probability of exactly k successes in n trials, at least k successes, and at most k successes. The Dice tab shows the full sum distribution for a given number of d6 dice.
How to Use
- Select the tab you need: Basic, Binomial, or Dice.
- Fill in the input values for that tab.
- Results are calculated instantly.
- In the Dice tab, review the distribution table to see probabilities for each possible sum.
Use Cases
Students verify probability homework and exam problems. Game developers calculate dice probabilities and expected values. Statistics students practice binomial distribution calculations.
FAQ
- What is the difference between probability and odds? — Probability is a value between 0 and 1 expressing the likelihood of an event. Odds express the ratio of favorable to unfavorable outcomes.
- When should I use the Binomial tab? — Use it when repeating the same trial n times, where each trial is independent and the probability of success is constant.
- Does the Dice tab support non-d6 dice? — The current version supports standard 6-sided dice (d6) only.