Population Doubling Time Calculator

Calculate how long it takes for a population to double, or determine growth rate from doubling time.

Calculation Mode

Calculate From

Growth Rate (r)

Initial Population

Projection Time

Formula: t_d = ln(2) / r
Where t_d = doubling time, r = growth rate

Doubling Time

9.90

time units

Growth Rate (r)

0.0700

Rule of 70

10.00

Doublings in 50 time5.05

Final Population33.12K

Tripling Time15.69 time units

Quadrupling Time19.80 time units

t = 0.01.00K

t = 9.92.00K

t = 19.84.00K

t = 29.78.00K

t = 39.616.00K

t = 49.532.00K