Basic Probability Calculator

Calculate the probability of the number of outcomes that satisfy the requirement, and the total possible outcomes

Basic Probability Calculator

  • Calculate basic probability by entering the number of outcomes that satisfy the requirement, and total possible outcomes.

    Simple example: a coin toss

    In a coin toss, you have to choose between head or tails, so there is one outcome which can be head or tails, and two possible outcomes.
    Formula:

    Probability =
    either head or tails mean one option
    two possible outcomes
    =
    1
    2
    = 0.5 or 50%

    So the possibility in a coin toss is 50%

    Other Example:

    Suppose we have a bag of wafers with different forms, 3 of them in a triangle form, 2 in a star form, and 5 in a heart form.
    ▴ ▴ ▴ ★ ★ ♥ ♥ ♥ ♥ ♥

    what is the probability of pulling a triangle?

    Probability of triangle =
    ▴ ▴ ▴
    ▴ ▴ ▴ ★ ★ ♥ ♥ ♥ ♥ ♥
    =
    3
    10
    = 0.3 or 30%

    what is the probability of pulling a star?

    Probability of star =
    ★ ★
    ▴ ▴ ▴ ★ ★ ♥ ♥ ♥ ♥ ♥
    =
    2
    10
    = 0.2 or 20%

    what is the probability of pulling a heart?

    Probability of star =
    ♥ ♥ ♥ ♥ ♥
    ▴ ▴ ▴ ★ ★ ♥ ♥ ♥ ♥ ♥
    =
    5
    10
    = 0.5 or 50%