Population Doubling Time Calculator
Calculate how long it takes for a population to double, or determine growth rate from doubling time.
Calculation Mode
Formula: td = ln(2) / r
Where td = doubling time, r = growth rate
Doubling Time
9.90
time units
Growth Rate (r)
0.0700
Rule of 70
10.00
Growth Projections
Doublings in 50 time5.05
Final Population33.12K
Tripling Time15.69 time units
Quadrupling Time19.80 time units
Doubling Schedule
t = 0.01.00K
t = 9.92.00K
t = 19.84.00K
t = 29.78.00K
t = 39.616.00K
t = 49.532.00K
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.