How does IFR differ from CFR?

Case Fatality Rate (CFR) = deaths / confirmed cases. IFR = deaths / true infections including unreported. During COVID-19, CFR was ~1–3% while IFR was estimated at 0.1–0.3% in high-income countries once seroprevalence was measured.

What is the IFR for COVID-19?

The WHO-affiliated review by Ioannidis (2021) found median COVID-19 IFR around 0.27% globally, varying enormously by age ( 10% over 85) and healthcare system capacity.

Infection Fatality Rate (IFR) Calculator

Calculate the Infection Fatality Rate IFR = deaths / total infections × 100%. Unlike CFR (case fatality rate), IFR uses estimated total infections (including unreported) as the denominator. Critical for true pandemic mortality estimation.

Data set — comma or newline separated

Statistical Results — n = 8

Count (n)8

Sum (Σx)40

Min2

Max9

Range7

Q14

Q35.5

IQR1.5

Mean (μ)5

Median4.5

Mode4

Pop. Variance (σ²)4

Pop. Std Dev (σ)2

Sample Variance (s²)4.571428571

Sample Std Dev (s)2.138089935

Skewness0.65625

Excess Kurtosis-0.21875

How to Use

Enter the values for the scenario you are assessing. Calculate the Infection Fatality Rate IFR = deaths / total infections × 100%. Unlike CFR (case fatality rate), IFR uses estimated total infections (including unreported) as the denominator. Critical for true pandemic mortality estimation. Use the ifr calculator result to inform your calculation.

Infection Fatality Rate (IFR) Calculator

How to Use

Frequently Asked Questions

How does IFR differ from CFR?

What is the IFR for COVID-19?