Enter the total number of sections on a spinner and the total number of sections containing the desired result to calculate the probability of the spinner landing on that result.

Spinner Probability Formula

The following formula is used to calculate spinner probability. 

P (X) = Z / Y *100
  • Where P (X) is the probability of the spinner hitting a value X (%)
  • Z is the total number of sections that the value X appears
  • Y is the total number of sections on the spinner

To calculate a spinner probability divide the number of sections that the item appears in by the total number of sections.

What is a spinner probability?

Spinner Probability Definition:

Spinner probability is defined as the change or probability that a spinner will land on a given value when spun.

For example, if there is a spinner with 10 different sections and you want to know the change to land on just one of those sections, the spinner probability would be 1/10 = 10%.

How to calculate spinner probability?

The following example outlines the steps required to calculate a spinner probability:

First, determine the total number of sections on the spinner. In this example, there are 15 total sections the spinner could land on when spun.

Next, determine the total number of sections that have the desired result. In this example, two of the sections contain the desired result/value.

Finally, calculate the spinner probability using the formula above:

P (X) = Z / Y *100

P (X) = 2 / 15 *100

P (X) = 13.333%