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Calculate Incidence Rate

Calculator for the incidence rate from group size and number of cases. The incidence rate tells, how many cases in a group of a certain size, often 100000 (one hundred thousand), occur. In medical terms, these often are newly infected persons per month. Especially during the COVID-19 pandemic , this term found its way from science to everyday language.
Reference size is preset to the common value. Please enter two of the three other values, the remaining value will be calculated.

Reference size:
Group size:
Number of cases:
Incidence rate:

Decimal places: 0 1 2 3 4 5 6 7 8 9

Example: at a group of 2500 people and an incidence rate of 120, 3 affected (ill, infected, ...) people are to be expected.

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