Vaccine Efficacy
Result
Calculated result
1
Based on the values entered.
↗ Health
Vaccine Efficacy — free online calculator.
Formula
VE = (1 − ARV/ARU) × 100%; NNT = 1/(ARU − ARV)
- Vaccine Efficacy calculates its result from Arv, Aru. It uses the formula VE = (1 − ARV/ARU) × 100%; NNT = 1/(ARU − ARV). Change any input to recalculate the result instantly. This is an informational calculation and is not medical advice.
- The main inputs are Arv, Aru. Enter them in the units and format shown in the calculator.
- Use the measurement units shown beside each field. The result is an estimate and should be interpreted in context.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Vaccine Efficacy
Inputs
- Arv: 2
- Aru: 3
Using Arv = 2, Aru = 3, the calculated result is 1.
Sample result: Calculating…
Frequently asked questions
What does the Vaccine Efficacy calculate?
Vaccine Efficacy — free online calculator.
Which values should I enter?
Enter Arv, Aru using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: VE = (1 − ARV/ARU) × 100%; NNT = 1/(ARU − ARV).
Why might my result differ from another source?
Results can differ because measurement methods, rounding and assumptions vary. This calculator is an estimate and is not a medical diagnosis.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.