Probability Calculator

Probability of Two Events

Compute the complements, union, intersection, exclusive OR, and many other probabilities for two independent events.

Probability of A: P(A) (Between 0 and 1)

Probability of B: P(B) (Between 0 and 1)

= Calculate

× Reset

Result:

Probability of A NOT occuring: P(A')
Probability of B NOT occuring: P(B')
Probability of A and B both occuring: P(A∩B)
Probability that A or B or both occur: P(A∪B)
Probability that A or B occurs but NOT both: P(AΔB)
Probability of neither A nor B occuring: P((A∪B)')
Probability of A occuring but NOT B:
Probability of B occuring but NOT A:

Probability Solver for Two Events

Find the rest of the probabilities by inputting two independent events.

Probability of:

A: P(A) B: P(B) A NOT occuring: P(A') B NOT occuring: P(B') A and B both occuring: P(A∩B) A or B or both occur: P(A∪B) A or B occurs but NOT both: P(AΔB) Neither A nor B occuring: P((A∪B)')

Probability of:

A: P(A) B: P(B) A NOT occuring: P(A') B NOT occuring: P(B') A and B both occuring: P(A∩B) A or B or both occur: P(A∪B) A or B occurs but NOT both: P(AΔB) Neither A nor B occuring: P((A∪B)')

= Calculate

× Reset

Result:

Probability of Series of Independent Events

Find the probabilities based on the given independent events and their repeat times.

Event A Probability: (Between 0 and 1)

Repeat Times:

Event B Probability: (Between 0 and 1)

Repeat Times:

= Calculate

× Reset

Result:

Probability of Normal Distribution

This calculator computes the probabilities and range of the confidence intervals for the normal distribution.

Mean (µ):

Standard Deviation (σ):

Left Bound (L_b): For negative infinite, use -Infinity

Right Bound (R_b): For positive infinite, use Infinity

= Calculate

× Reset

Result:

Confidence Intervals Table:

Confidence	Range	n