Simple Interest Earned

The Simple Interest Earned calculator computes an estimate of how much interest is earned over time.  However, it ignores compounded interest and will result in errors with large numbers or long periods of time.

INSTRUCTIONS: Choose units and enter the following:

• (P) Principal Amount Invested
• (r) Fixed Interest Rate per Period.
• (t) Number of Periods

Simple Interest Earned (SI): The calculator computes the amount of interest earned over the period of time.  The interest is returned in U.S. dollars.  However, this can be automatically converted to other currency units via the pull-down menu.

The Math / Science

This formula provides a rough estimate of the earnings of a principal amount (P) at a a certain interest rate (r) over a number (t) of periods.  This formula is useful for a quick rough estimate of return on investment.

Personal Finance Calculators

• Monthly Loan Payment: Computes the monthly payment of a fixed interest rate loan (e.g., home mortgage or car loan).
• Credit Card Equation:  Computes the number of months to pay off a credit card.
• Mortgage Affordability: Compute the amount of principal one can borrow based on monthly payment, duration and interest rate.
• Leverage Ratio: Calculates a ratio describing debt to income.
• Compound Interest: Computes the compounded interest on a fixed interest rate investment
• CAGR: Computes the compounded annual growth rate achieved on an investment.
• Rule of 72: Provides a quick estimate on time to double an investment
• Simple Interest Earned: Computes a rough estimate on interest earned over time.
• Wage Calculator: Computes the annual, monthly and weekly pay amounts base on hourly wage and hours per week.
• Current Mortgage Rates:
  • 30 Year Fixed Interest Rate: 6.76 %
  • 15 Year Fixed Interest Rate: 6.15 %
  •  7/6 SOFR ARM: [Invalid Constant]

Financial Calculators

Also consider the following finance and accounting equations and calculators:

• Net Cash flow from Operation
• Current Ratio or Liquidity Ratio
• Capital Recovery Factor
• Annual Percentage Yield
• Simple interest Earned
• Debt to Equity Ratio
• Compound interest Future Value
• Personal Finace
• Microeconomics Calculator
• Annualized Amortization
• Credit Card Equation
• Leverage Ratio
• Cash Flow
• Compound Interest
• CAGR
• Present Value
• Future Value
• Rule of 72
• Simple Interest Earned