Work out doubling time of cases instantly with clear inputs, formula shown and shareable results.
Fits an exponential curve through two case counts to give the growth rate and the time taken for cases to double.
Doubling time
r = ln(cases end / cases start) / days; doubling time = ln 2 / r
It converts an abstract growth rate into a timescale people can act on, such as bed capacity planning.
Reporting artefacts and changing test capacity distort case counts, so hospitalisations are often a better series.