Enter the total number of encounters and the total chances for encounters into the Calculator. The calculator will evaluate the Encounter Rate. 

Encounter Rate Formula

ER = E / C * 100


  • ER is the Encounter Rate (%)
  • E is the total number of encounters
  • C is the total chances for an encounter

To calculate Encounter Rate, divide the total number of encounters by the number of changes for an encounter.

How to Calculate Encounter Rate?

The following steps outline how to calculate the Encounter Rate.

  1. First, determine the total number of encounters. 
  2. Next, determine the total chances for an encounter. 
  3. Next, gather the formula from above = ER = E / C * 100.
  4. Finally, calculate the Encounter Rate.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

total number of encounters = 78

total chances for encounter = 100

Frequently Asked Questions

What is an Encounter Rate?

Encounter Rate is a statistical measure that represents the percentage of occurrences (encounters) out of the total number of opportunities or chances for those occurrences. It is calculated by dividing the total number of encounters by the total number of chances for an encounter, then multiplying by 100 to get a percentage.

Why is calculating the Encounter Rate important?

Calculating the Encounter Rate is important for understanding the frequency or likelihood of events occurring within a given set of opportunities. It can be applied in various fields such as healthcare, research, marketing, and gaming to evaluate the effectiveness, efficiency, or performance of different processes or activities.

Can the Encounter Rate formula be used for any type of event?

Yes, the Encounter Rate formula is versatile and can be applied to any situation where you want to calculate the frequency of occurrences out of a total number of opportunities. Whether it’s calculating the rate of patient encounters in a clinic, the occurrence of a specific event in a research study, or the frequency of a particular outcome in a game, the formula remains applicable.