Incidence Rate, Incidence Proportion and Prevalence
Incidence proportion, incidence rate per person-time, and point or period prevalence, as CDC defines them.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Measure
- Incidence rate (per person-time)
- New cases, or people with the condition for prevalence
- 16
- Population, or person-time for a rate
- 6400
- Person-time unit
- Person-years
- Multiplier
- per 1,000
Result: Incidence rate (per person-time): 2.5 per 1,000 person-years
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Measure
- New cases, or people with the condition for prevalence
- Population, or person-time for a rate
- Person-time unit (incidence rate only)
- Multiplier
How this is calculated
Citation
CDC. Principles of Epidemiology in Public Health Practice, 3rd ed., Lesson 3, section 2: Morbidity Frequency Measures (incidence proportion, incidence rate, point and period prevalence). Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.