R₀ número reprodução
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The R₀ calculator (basic reproduction number) estimates how many people, on average, one infected person will transmit a disease to during their infectious period. It uses the formula R₀ = β/γ, where β is the transmission rate and γ is the recovery rate. This tool is critical in public health to assess disease spread dynamics.
Epidemiologists use this metric to predict infection growth. Values above 1 indicate exponential spread, while below 1 suggest declining transmission. Applications include analyzing coronavirus outbreaks, HIV, or emerging infectious diseases.
To use the calculator, input β (transmission) and γ (recovery) rates. Note that R₀ is a theoretical approximation, as it doesn't account for prior immunity, public interventions, or population contact variations. It serves as a foundation for studies but should complement more complex epidemiological models.
Frequently asked questions
What does R₀ above 1 mean?
An R₀ above 1 indicates each infected person transmits the virus to more than one person, causing exponential infection growth.
How does vaccination relate to R₀?
Vaccination reduces spread by creating herd immunity, effectively lowering the observed R₀ in a population.
Is R₀ applicable to all diseases?
No. It's most relevant for consistently transmissible diseases like coronaviruses. Seasonal or vector-borne diseases require different modeling.
Do I need medical permission to use this calculator?
No. It's a mathematical tool for research purposes and does not replace professional diagnosis or advice.