Enter the total number of new cases and the total number of people in the population at risk to determine the cumulative incidence.

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## Cumulative Incidence Formula

The following formula is used to calculate the cumulative incidence.

CI = NC / TP

- Where CI is the cumulative incidence
- NC is the number of new cases of a disease
- Tp is the total population at risk

## Cumulative Incidence Definition

A cumulative incidence is a ratio of the number of new cases of a disease to the total population that could be exposed to the disease.

## Cumulative Incidence Example

How to calculate cumulative incidence?

**First, determine the number of new cases.**Measure the total number of new cases of the disease.

**Next, determine the total population.**Calculate the total population at risk.

**Finally, calculate the cumulative incidence.**Calculate the cumulative incidence using the equation above.

## FAQ

**What is cumulative incidence?**

A cumulative incidence rate is the ratio of the number of new cases of a disease to the total population at risk over a given time period.