Enter the total number of cases and the total population into the calculator to determine the prevalence of a disease.
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The following formula is used to calculate the prevalence rate of a disease.
P(%) = TC / TP *100
- Where P(%) is the prevalence rate
- TC is the total number of cases
- TP is the total population size
Prevalence is defined as the portion or percentage of a population that has contracted a certain disease.
How to calculate prevalence?
- First, determine the total number of cases.
Measure and determine the total number of people infected. For this example, we will say this number is 25.
- Next, determine the total population size.
For this example we will say the population size is 100 people.
- Finally, calculate the prevalence.
Using the formula above we find the prevalence is 25/100 * 100 = 25%.
Prevalence is a term most often used in medicine to describe what portion of a population has a certain disease. It can however be used in any other science to describe the rate of something occurring compared to a total number of events.