💰 Interest Calculator

What is a Simple vs Compound Interest Calculator?

An interest calculator is a financial tool that accurately predicts earnings from savings accounts, fixed deposits, and investment products. Simple interest applies a fixed rate only to the principal amount, generating the same interest each period. Compound interest, on the other hand, is "interest on interest," where earnings grow exponentially over time as interest is reinvested. This calculator supports both methods and offers various compounding frequencies for compound interest—annual, semi-annual, quarterly, monthly, and daily—allowing you to simulate real-world financial products precisely. Whether you're calculating bank deposit interest, P2P investment returns, loan interest costs, or long-term investment growth, this tool helps you visualize future asset values and make informed financial decisions.

Common Use Cases

How to Use

1. 1
   Choose Calculation Method

   Select "Simple" or "Compound" from the top tabs. Typically, savings use compound interest while loans use simple interest.
2. 2
   Enter Principal and Rate

   Input your initial investment (principal) and annual interest rate (%). Use preset buttons for quick entry of common amounts (1k~10M).
3. 3
   Set Period and Frequency

   Enter investment duration in years/months/days. For compound interest, select compounding frequency (annual, monthly, etc.) to match actual product terms.
4. 4
   Review Results and Compare

   Check the results panel for total interest, final amount, and effective annual rate (APY). Use the comparison button to see simple vs compound side-by-side.

Frequently Asked Questions