Probability Calculator

Calculate probabilities for various scenarios including two events, series of independent events, and normal distributions

Calculate probabilities for various scenarios including two events, series of independent events, and normal distributions.

To find out the union, intersection, and other related probabilities of two independent events.

Probability of A: P(A)

Probability of B: P(B)

Please input values between 0 and 1.

Please provide any 2 values below to calculate the rest probabilities of two independent events.

Probability of A: P(A)

Probability of B: P(B)

Probability of A NOT occurring: P(A')

Probability of B NOT occurring: P(B')

Probability of A and B both occurring: 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 occurring: P((A∪B)')

Please input values between 0 and 1.

Event

Probability

Repeat Times

Event A

Event B

Use the calculator below to find the area P shown in the normal distribution, as well as the confidence intervals for a range of confidence levels.

Mean: (μ)

Standard Deviation (σ):

Left Bound (L_b):

For negative infinite, use -inf

Right Bound (R_b):

For positive infinite, use inf

Probability is a fundamental concept in mathematics and statistics that measures the likelihood of events occurring.

• Mean (μ): Center of the distribution

• Standard Deviation (σ): Spread of the distribution

• 68-95-99.7 Rule: Empirical rule for normal distributions

• Z-Score: Number of standard deviations from mean