This rule of 70 reference table shows the time to double for a range of growth rate per period values. Every figure is computed with the same engine that powers our Rule of 70 Calculator, so the numbers are exact.
| Growth rate per period | Time to double |
|---|---|
| 1.8% | 38.89 |
| 3.5% | 20.00 |
| 5.3% | 13.21 |
| 7% | 10.00 |
| 11% | 6.36 |
| 14% | 5.00 |
| 21% | 3.33 |
| 35% | 2.00 |
| 49% | 1.43 |
| 7% | 1.00 |
How to use this table
Find the row closest to your growth rate per period and read across to the time to double. For a value between two rows, the real figure sits between them — or enter your exact numbers in the Rule of 70 Calculator for a precise answer.
Need a value that is not in the table? — the Rule of 70 Calculator does it instantly, for free, with the formula and a worked example built in.
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