Exponential growth calculator

Some things grow or decay in an exponential way. This means that for every time unit (e.g. a day) the metric changes with ± the same percentage.
If you can say "it doubles every _ days" => this means it has exponential growth/increase!
If you can say "it drops to half every _ days", it has logarithmic decay/decrease!

Growth calculation

Logarithmic decay

  • 2 → 1 = multiply by 0. (or -50.00 %) in 5730 year(s)
  • multiply by 0.988 (or -1.2 %) in 1 century
  • goes ÷ 2 every 57.26 century(s)
  • goes ÷ 5 every 132.96 century(s)
  • goes ÷ 10 every 190.22 century(s)
  • goes ÷ 100 every 380.44 century(s)

Extrapolation of data points

After 28.63 century(s)1.414interpolation
After 57.26 century(s)1.000data point
After 85.89 century(s)0.707extrapolation
After 114.52 century(s)0.500extrapolation
After 143.16 century(s)0.354extrapolation
After 171.79 century(s)0.250extrapolation

Examples