Simple Interest Calculator

Calculate simple interest and see the formula, with comparison to compound interest.

Interest

$150.00

Total Amount

$1,150.00

Formula: I = P * R * T = $1,000.00 * 5% * 3 = $150.00

What is a Simple Interest Calculator?

Calculate simple interest on a principal amount. See total interest, monthly interest, and compare with compound interest.

How to Use

Using the simple interest calculator is very simple:

  • Enter your values in the input fields
  • Click the calculate button
  • View the results instantly

Tips

  • Double-check your inputs for accurate results
  • This tool is for estimation - consult a professional for important decisions
  • Save your results for future reference

Frequently Asked Questions

What is simple interest?+
Simple interest is calculated only on the initial principal. Formula: Interest = Principal * Rate * Time. Unlike compound interest, your earnings don't generate earnings of their own.
What is the difference between simple and compound interest?+
Simple interest is calculated only on the principal. Compound interest is calculated on the principal and accumulated interest. $1,000 at 5% for 3 years: simple interest = $150. Compound interest = $157.63. The difference grows with time and rate.
Where is simple interest used?+
Simple interest is used for auto loans, personal loans, and short-term loans. Most mortgages and credit cards use compound interest. Always confirm which type your loan uses.
How do I calculate the amount due?+
Amount Due = Principal + Interest. Or: Amount Due = Principal * (1 + Rate * Time). $1,000 at 5% for 3 years: amount due = 1,000 * (1 + 0.05 * 3) = $1,150.

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