Probability measures the likelihood of an event occurring, expressed as a number between 0 (impossible) and 1 (certain).

Math Calculators

Probability Calculator – Calculate Event Probability

Calculate the probability of events. Find single event probability and combined event probabilities.

Favorable Outcomes

Total Outcomes

Probability Calculator Formula

P(Event) = Favorable Outcomes / Total Outcomes

Percentage = P × 100

Odds = Favorable : Unfavorable

Drawing a red card from a deck:

Favorable: 26, Total: 52

P = 26/52 = 0.5 (50%)

What is probability?

Calculate combinations (nCr). Find ways to choose r items from n items where order does not matter.

Calculate permutations (nPr). Find the number of ways to arrange r items from n items where order matters.

Calculate percentages easily. Find what percent one number is of another, or calculate the percentage of a number.