Enter any total quantity and the number of events or cases into the calculator to determine the rate per 1000.

Rate Per 1000 Formula

The following formula is used to calculate a rate per 1000.

RPO = E/P*1000

  • Where RPO is the rate per one thousand
  • E is the number of events/occurrence/etc from the total quantity
  • P is the total quantity

Rate Per 1000 Definition

A rate per 1000 is typically used to describe the total number of events or cases that occur in a population per 1000 people. This can be applied to any data set of numbers though, like the rate of defects per 1000 manufactured goods and so on.

Rate Per 1000 Example

How to calculate rate per 1000?

The first step in calculating the rate per 1000 is to determine the total population or data set size that you are using for the problem.

In this case, the total population size is calculated to be 12000.

Next, the number of occurrences in that population must be measured. These occurrences could be failures of a product, rates of defects, or any other measure of occurrence.

For this example, we are looking at a product that is being made in a factory and there were 500 units that came out with failures out of the total population.

Finally, calculate the rate per 1000 using the formula above:

RPO = E/P*1000

RPO = 500/12000*1000

RPO = 41.667 failures per 1000.


What is rate per 1000.

Rate per 1000 is a measure of the number of occurrences of a specific event per 1000 units of a data set.