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econ.population-doubling-time Calculator
Calculates population doubling time from a given annual growth rate using the Rule of 70, and projects population at any future year. A country growing at 3.5%/year doubles its population in 20 years — the speed of demographic change is rarely intuitive.
Inputs
Growth Rate Pct
Annual percentage increase. Enter as a percentage. Compound growth is exponential — small differences in rate become enormous over long periods.
Current Population M
Rate of charge flow (A). I = V/R. Above ~100 mA through the body can be lethal. Fuses protect against overcurrent.
Carrying Capacity M
Maximum throughput or storage. Operating near 100% capacity typically increases failures and wait times.
Results
doubling time (years)
The computed duration or time value.
population in 100 years (M)
The value at the specified point or condition.
exponential projection 100yr (M)
Sample size or count used in the calculation.
current population (M)
Electric charge flow rate (A). Governs wire sizing — too much current causes dangerous heating. Fuses protect circuits from overcurrent.
rule of 70
Reference formula or conversion factor shown for context.