Vaccine Efficacy Calculator

VE from vaccinated and unvaccinated incidence rates.

Medical Disclaimer

This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.

Inputs

Cases in vaccinated group

Total vaccinated

Cases in unvaccinated group

Total unvaccinated

Tab to move between fields

Results

Vaccine efficacy (%)

75%

Relative risk0.25

Absolute risk reduction (%)0.6%

Number needed to vaccinate167

95% CI lower (%)59.22%

95% CI upper (%)84.67%

How to Use This Calculator

Enter Cases in vaccinated group, Total vaccinated, and Cases in unvaccinated group.
Set Total unvaccinated.
Review the Vaccine efficacy (%) (%) result.
Use Relative risk and Absolute risk reduction (%) (%) to inform your decision.

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