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Incidence Rate Calculator

Incidence Rate Calculator

Perform the high-speed and accurate incidence rate calculation with the help of this online incidence rate calculator.

Total Number Of New Cases:

Total Population At Risk:

I Want To Calculate For A Different Population Size:

Population Size:

Per People:


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Get the assistance of this incidence rate calculator to calculate the number of new cases of a disease in a specific time duration with respect to the population at risk and the total population size.

Incidence Rate Definition:

The incidence rate is the calculation of the number of people who get diseased during a specific time frame and the comparison of the population that was at risk. Meanwhile, The incidence rate is the scale that is used in epidemiology to help in measuring the number of new cases of disease that appear during an interval of time, exposed person and the observation time.    

Incidence Rate Formula:

Incidence Rate = Total no. of new cases  / Population at risk x Population size

You can easily use the above-mentioned formula to calculate the incidence rate manually, but if you don’t want to do the manual calculations and want to reduce the risk of human error, then get the assistance of our online incidence rate calculator. With it, you can perform countless calculations free of cost. 

What Is Epidemiology?

Epidemiology is the analysis that helps to find when, who, and where a disease or state of health has started arising in the population. The basic aim is to bring improvements in the health sector, and research clinics and allow estimating the factor of risks and other factors that can become the reason for spreading diseases. All the preventing factors and the treatment of diseases depend upon epidemiological knowledge. 

How To Calculate Incidence Rate?

Let’s take a look at the following steps to calculate the incidence rate: 

  • The first thing that you should determine is the number of new cases of a disease.
  • Now find out the average population that can be exposed to the disease.
  • Add the values in the formula to get the incidence rate. 

If it seems difficult then you can make this calculation easier with the help of a free incident rate calculator. It will just require you to add a couple of inputs and will provide you with the correct incidence rate instantly. 


Let’s assume in a Group of 50,000 people, 2 people got Cancer during the Period of One Year. Now How to Calculate incidence?


Given that:

Number of new cases = 2

Population at risk = 50,000

Now add these values to the formula for calculating incidence rate:

Incidence rate formula = 2 / 50,000 x 100,000 = 0.00004 x 100,000

Incidence Rate = 4 

Working of Incidence Rate Calculator:

Our online converter provides a straightforward way to calculate the incidence rate effortlessly. Let’s see how:


  • Enter the values of “ new cases”, and “population at risk”, Choose whether to “Calculate For a Different Population Size or not”, and add the “population size” in the specified fields.
  • Tap on the “calculate” button of the attack rate calculator.  


  • Incidence Rate.
  • Step-by-step calculation.


What Is The Incidence Rate Ratio?

A rate ratio in epidemiology is also called the incidence rate ratio. It is basically a relative difference measure that is utilized to perform the comparison of incidence rates upon which events occur at a given interval. 

Can Incidence Rates Be Calculated From Case-Control?

No, A case study can never provide accurate information about the incidence rate. 

What Is The Difference Between Risk And Incidence Rate?

Risk indicates the number of new cases that occur in a specific period of time divided by the risk population that has a risk of becoming a case. On the other hand, the rate is the number of new cases that occur during the whole amount of time and is at risk of becoming a case.    


From the source of Calculate the incidence rate.

From the source of Wikipedia: Incidence (epidemiology).