Case Fatality Rate Calculator
Enter the number of confirmed cases and deaths to instantly calculate the case fatality rate (CFR) with confidence intervals.
Use the Case Fatality Rate Calculator
Outbreak Data
Total number of laboratory-confirmed or clinically diagnosed cases.
Number of deaths among the confirmed cases.
Case Fatality Rate
Enter case and death counts to calculate CFR.
Case Fatality Rate
CI Lower
CI Upper
0%
5%
10%+
Summary
- Total Cases
- Total Deaths
- Survivors (approx.)
- Survival Rate
- Confidence Interval
CFR Reference — Known Diseases
Seasonal Influenza
~0.1%
COVID-19 (global avg.)
~1–2%
SARS (2003)
~9.6%
MERS
~34%
Ebola (historical)
25–90%
Summary
Enter the number of confirmed cases and deaths to instantly calculate the case fatality rate (CFR) with confidence intervals.
How it works
- Enter the total number of confirmed cases in your dataset.
- Enter the number of deaths among those confirmed cases.
- The calculator instantly computes CFR = (Deaths / Cases) x 100.
- A 95% Wilson confidence interval is shown to reflect statistical uncertainty.
- Use the severity rating to contextualize the CFR against known disease benchmarks.
Use cases
- Epidemiologists tracking mortality during an active outbreak.
- Public health officials comparing disease severity across regions.
- Medical researchers analyzing historical outbreak data.
- Journalists and communicators reporting outbreak statistics accurately.
- Students and educators studying infectious disease epidemiology.
- Healthcare planners estimating resource needs during an epidemic.
Frequently Asked Questions
Last updated: 2026-09-21 ·
Reviewed by Nham Vu