Rule of 72: Years To Double = 72/Interest Rate
- Have an investment growing at 10% interest? It will double in 7.2 years.
- Want your investment to double in 5 years? You need 72/5 or about 15% interest.
- Growing at 2% a week? You’ll double in 72/2 or 36 weeks. You can use this rule for any duration of time, not just years.
- Inflation at 4%? It will halve your money in 72/4 or 18 years.
Source: Mental Math Shortcuts
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