Compound Interest Calculator
We can use the law of 72 to calculate the time required for the principal to double.
The 12% return doubles in six years with 72/12 = 6 => compounding.
Check out the effect of magically increasing the principal.
Total Profit
Resulting Amount
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FAQ
Enter initial amount, return rate, and investment period to see the final amount and total profit calculated with compound interest.
The Rule of 72 is an easy way to calculate the period for investment principal to double. Divide 72 by the annual return rate to get the approximate period.
Simple interest only applies to principal, but compound interest applies to interest as well, causing exponential growth over time.