Probability Calculator

Probability of Two Events

This calculator determines two independent events' intersection, union, and other related probabilities.

Probability of A: P(A) (Enter value between 0 and 1)

Probability of B: P(B) (Enter value 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

This calculator computes the rest of the probabilities of two given 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

Event A Probability: (Enter value between 0 and 1)

Repeat Times:

Event B Probability: (Enter value between 0 and 1)

Repeat Times:

= Calculate

× Reset

Result:

Probability of Normal Distribution

This calculator determines the probability of a normal curve and confidence intervals for a range of confidence levels.

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