Simple Interest Calculator
Quickly compute simple interest on any principal amount — instantly, right in your browser.
Need to work out simple interest on a loan, deposit or investment? Lilu Baba's Simple Interest Calculator applies the standard SI = P × R × T / 100 formula so you get the interest amount and total payable instantly, without doing the math by hand.
How to use this calculator
- Enter the principal amount you're investing or borrowing.
- Set the annual interest rate.
- Choose the time period in years — the interest and total amount update instantly.
Total Amount
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Principal Amount
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Simple Interest
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FAQ
Simple Interest Calculator — frequently asked questions
Simple Interest = (Principal × Rate × Time) / 100, where Rate is the annual interest rate and Time is in years.
Simple interest is calculated only on the original principal, while compound interest is calculated on the principal plus previously earned interest.