About this calculator
Simple interest is calculated only on the principal amount, not on accumulated interest. Used in some short-term loans and educational examples.
Formula
SI = P × R × T / 100
How to use this calculator
Enter principal, annual rate and time in years.
Frequently asked questions
Simple vs compound interest?
Simple interest grows linearly. Compound interest grows exponentially because interest earns interest. Most investments and bank deposits use compounding.
Are these calculators free to use?
Yes. All calculators are free, require no signup, and run entirely in your browser.
Results are estimates for planning purposes only — not investment, tax or legal advice. Verify rates on official sources before acting. Compare brokers on our best stock brokers guide or use the brokerage calculator.