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Growth
Rule of 72 Calculator
Estimate how long it takes to double, triple, or 10× your money. Compare quick rules to exact compounding math.
How long until your money multiplies?
Rule-of-thumb vs exact years at your return and compounding.
1. Return rate
Expected annual growth
Most accurate for rates between 6% and 12%.
Quick presets
2. Compounding
How often interest adds up
The rule ignores frequency. Exact math uses what you pick above.
FAQ