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2. Rule of 72 - Wikipedia

   en.wikipedia.org/wiki/Rule_of_72

   Although scientific calculators and spreadsheet programs have functions to find the accurate doubling time, the rules are useful for mental calculations and when only a basic calculator is available. [2] These rules apply to exponential growth and are therefore used for compound interest as opposed to simple interest calculations.

3. Interest - Wikipedia

   en.wikipedia.org/wiki/Interest

   To approximate how long it takes for money to double at a given interest rate, that is, for accumulated compound interest to reach or exceed the initial deposit, divide 72 by the percentage interest rate. For example, compounding at an annual interest rate of 6 percent, it will take 72/6 = 12 years for the money to double.

4. How to calculate the present and future value of annuities - AOL

   www.aol.com/finance/calculate-present-future...

   Therefore, the future value of your regular $1,000 investments over five years at a 5 percent interest rate would be about $5,525.63. Note: This calculation assumes equal annual contributions and ...

5. Mortgage calculator - Wikipedia

   en.wikipedia.org/wiki/Mortgage_calculator

   When purchasing a new home, most buyers choose to finance a portion of the purchase price via the use of a mortgage. Prior to the wide availability of mortgage calculators, those wishing to understand the financial implications of changes to the five main variables in a mortgage transaction were forced to use compound interest rate tables.

6. Effective interest rate - Wikipedia

   en.wikipedia.org/wiki/Effective_interest_rate

   The effective interest rate is calculated as if compounded annually. The effective rate is calculated in the following way, where r is the effective annual rate, i the nominal rate, and n the number of compounding periods per year (for example, 12 for monthly compounding): [1]

7. Compound annual growth rate - Wikipedia

   en.wikipedia.org/wiki/Compound_annual_growth_rate

   Compound annual growth rate (CAGR) is a business, economics and investing term representing the mean annualized growth rate for compounding values over a given time period. [1] [2] CAGR smoothes the effect of volatility of periodic values that can render arithmetic means less meaningful. It is particularly useful to compare growth rates of ...