What is Simple Interest Calculator?
Calculate simple interest, total interest amount and final value for any principal amount, interest rate, and time period Simply enter your values, and the calculator instantly computes accurate results using standard financial formulas. All calculations are performed entirely in your browser — nothing is stored or transmitted.
Formula Used
P = Principal amount | R = Annual interest rate (%) | T = Time period in years | Simple interest does not compound — interest is calculated only on the original principal
How to Use This Calculator
- Enter the principal amount (initial investment or loan)
- Enter the annual interest rate percentage
- Enter the time period in years (or months, converted to years)
- Click Calculate to see total interest and final amount
- Compare with compound interest to see the compounding advantage
Worked Example
Principal: ₹1,00,000 | Rate: 8% | Time: 3 years → SI = ₹24,000 | Total Amount: ₹1,24,000 (vs ₹1,25,971 with compound interest)
Why Use This Tool?
- Instant calculation for short-term loans and deposits
- Understand interest cost on personal loans and gold loans
- Compare simple vs compound interest visually
- Useful for calculating interest on court judgements and legal matters
Frequently Asked Questions
What is Simple Interest?
Simple Interest is calculated only on the original principal, not on accumulated interest. Formula: SI = P × R × T / 100. For example, ₹1 lakh at 10% for 2 years earns ₹20,000 in simple interest.
Where is simple interest used?
Simple interest is used in short-term personal loans, auto loans (some), gold loans, government bonds, and some savings accounts. It is also used in legal interest calculations and court-ordered payments.
Simple interest vs compound interest — which is better?
As an investor: compound interest is better as returns grow exponentially. As a borrower: simple interest is better as you pay less. Most bank deposits and mutual funds use compound interest, while some personal loans use simple interest.
Explore more investment & mutual funds calculators or try our other free financial tools.