This doubling time reference table shows the doubling time (periods) for a range of growth rate per period values. Every figure is computed with the same engine that powers our Doubling Time Calculator, so the numbers are exact.
| Growth rate per period | Doubling time (periods) | Rule of 72 estimate |
|---|---|---|
| 1.8% | 38.85 | 40.00 |
| 3.5% | 20.15 | 20.57 |
| 5.3% | 13.42 | 13.58 |
| 7% | 10.24 | 10.29 |
| 11% | 6.64 | 6.55 |
| 14% | 5.29 | 5.14 |
| 21% | 3.64 | 3.43 |
| 35% | 2.31 | 2.06 |
| 49% | 1.74 | 1.47 |
| 7% | 1.31 | 1.03 |
How to use this table
Find the row closest to your growth rate per period and read across to the doubling time (periods). For a value between two rows, the real figure sits between them — or enter your exact numbers in the Doubling Time Calculator for a precise answer.
Need a value that is not in the table? — the Doubling Time Calculator does it instantly, for free, with the formula and a worked example built in.
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