Simple vs compound interest calculator

Set an amount, rate and number of years to compare simple and compound interest, compounded yearly, monthly, daily or continuously.

Learn compound interest properly

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Questions students ask

What is the compound interest formula?

A = P(1 + r/n)^(nt), with rate r as a decimal, compounded n times a year for t years.

What is the rule of 72?

Divide 72 by the yearly interest rate in percent for roughly the number of years it takes money to double.

Free notes on compound interest

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