The rule of 72
Divide 72 by the rate and you get roughly the number of years money takes to double. It is the most useful piece of mental arithmetic in personal finance, and it is an approximation. This shows the shortcut and the exact answer together, so you can see where it drifts.
The rule of 72
Years to double
| By the rule of 72 | |
|---|---|
| Exact answer | |
| Doublings in your horizon | |
| What the amount becomes |
Fill in the figures and the answer appears here.
What this sum leaves out
- The rule is closest to right near 8 per cent and drifts either side of it. At 2 per cent it is early by about half a year; at 20 per cent it is late by about half a year. The exact line above shows the difference each time.
- It assumes one rate, compounded once a year, that never changes. Nothing real does that, and the order in which good and bad years arrive changes the outcome.
- Tax, fees and inflation are not in it. A rate that doubles your money in twelve years doubles your purchasing power considerably later.
- It works just as well on money you owe. A debt at 18 per cent doubles in four years if nothing is paid, and that is the same arithmetic.
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This calculator is an illustration, not a quotation, a projection or a recommendation. It performs arithmetic on figures supplied by the reader and supplies no rate, return, premium or benefit of its own. Results depend entirely on the assumptions entered and will differ from any real contract, plan or account. Canadian Wealth Creation Centre Inc. is licensed for insurance distribution and is not registered with CIRO; nothing here is securities advice. No figure entered here is stored, transmitted or seen by anyone.
It is a sum, not a promise. Change one assumption and the answer changes, which is the point of it. Use it to understand the shape of a question, then check the specifics against a real statement, a real contract, or a person licensed where you live.
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