Fluorescent Probability Calculator
Included calculators
- Basic probability from favourable and total outcomes
- Complement probability
- Independent-event intersection
- Union probability
- Conditional probability
- Bayes’ theorem
- Binomial probability:
- Exactly
ksuccesses - At most
ksuccesses - At least
ksuccesses
- Exactly
- Permutations
- Combinations
Features
- Decimal and percentage results
- Odds-in-favour display
- Step-by-step calculations
- Input and probability-range validation
- Example, clear, reset, and copy buttons
- Optional button sound effects
- Fluorescent cyan, green, pink, and black design
- Responsive on mobile and desktop
P
Probability Calculator
Calculate probability, event rules, Bayes results, binomial outcomes, permutations, and combinations.
BASIC PROBABILITY
Favourable outcomes ÷ total outcomes
out of
TWO-EVENT PROBABILITY
Intersection, union, or complement
CONDITIONAL PROBABILITY
P(A|B) = P(A ∩ B) ÷ P(B)
BAYES' THEOREM
Update the probability of A after observing B
BINOMIAL PROBABILITY
Repeated independent success-or-failure trials
PERMUTATIONS & COMBINATIONS
Count ordered or unordered selections
RESULT
Ready to calculate
Select a probability mode, enter values, and press Calculate.
Decimal
—
Percentage
—
Odds in favour
—
Show step-by-step calculation
Input rule: Enter probabilities as decimals from 0 to 1. For example, enter 25% as 0.25.