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`Ro72 = 72/ "r" `

Enter a value for all fields

This **Rule of 72** calculator computes the approximate period to double one's investment.

**INSTRUCTIONS:** Enter the following:

- (
**r**) This is the annual interest rate

**Doubling Period (R72):** The calculator estimates the number of periods to double one's investment.

This formula approximates the period to double one's investment based on the earning percentage (r) per period. The result is the number of periods in the same units (e.g. years for 5% per year) as the period unit for the rate of return. This serves as a quick comparison for evaluating investments.

**Annualized Amortization**- computes the monthly payment of a fixed interest rate loan (e.g. home mortgage).**Credit Card Equation**- computes the number of months to pay off a credit card.**Affordable Borrowing Amount**: - compute the amount of principal one can borrow based on monthly payment.**Leverage Ratio**- calculates a ratio describing debt to income.**Cash Flow**- calculates the difference between income an expenses**Compound Interest**- computes the compounded interest on a fixed interest rate investment**CAGR**- computes the compounded annual growth rate achieved on an investment.**Present Value**- computes the present value of a fixed annuity.**Future Value**- computes the future value of a fixed annuity.**Rule of 72**- provides a quick estimate on time to double an investment**Simple Interest Earned**- a rough estimate on interest earned over time.**Wage Calculator**- Computes the annual, monthly and weekly pay amounts base on hourly wage.