# 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%