Interest Calculator
Solve various problems related to money, finance, mortgage, loan, checking, credit card and savings accounts.
Regular Deposits
Problem:
Solve for principal amount.
Inputs:
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Solution:
Principal Amount (P) = HAS NOT BEEN CALCULATED
Change Equation or Formulas:
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Compound Interest
 | Future dollar amount after a period of time |
Where
| A | = | future value |
| P | = | present value |
| i | = | interest rate |
| n | = | years |
| q | = | number of compounds per year |
Simple Interest
 | Future dollar amount after a period of time |
Where
| A | = | future value |
| P | = | present value |
| i | = | interest rate |
| n | = | years |
Annual Percentage Rate
 | simple interest equal to the compounded interest during the year |
Where
| r | = | annual percentage rate |
| i | = | interest rate |
| q | = | number of time compounded per year |
Regular Deposits
 | simple interest equal to the compounded interest during the year |
Where
| P | = | principal after n years |
| M | = | deposit amount per period |
| i | = | interest rate |
| q | = | number of periods in a year |
| n | = | number of years |
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