Finance
Simple & Compound Interest Calculator
- Browser-based
- No signup
Enter principal, annual interest rate, and term in years or months. Choose simple interest or monthly compound interest to see interest and total amount.
100% Client-Side
Your data never leaves your computer.
How to use this tool
Enter the principal amount, annual interest rate, and time period. Choose simple or compound interest, then calculate to see total interest and the final amount.
Worked example
Example: $5,000 at 5% simple interest for 3 years earns $750 in interest for a total of $5,750. The same amount compounded monthly for 3 years grows to about $5,807.
How it works
Enter principal, annual interest rate, and term. Simple interest uses I = P × r × t. Compound interest compounds monthly using standard periodic compounding. Results show interest earned or charged and the total amount. Fees and taxes are not included.
Limitations
Results are estimates for educational purposes and are not financial advice. Compounding methods and fees may differ in practice. Consult a qualified financial professional for personal guidance.
Privacy and file handling
Your data is processed in your browser and is not uploaded to our server.
Frequently asked questions
What is the difference between simple and compound interest?
Simple interest is principal × rate × time. Compound interest adds interest to the balance over time; this tool compounds monthly.
Is this for loans or savings?
Either. It estimates interest on a principal over a term. For amortizing loan payments, use the Loan Calculator.
Does this include fees or taxes?
No. Results are estimates based only on principal, rate, term, and interest type.
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