Easily compute simple interest, total payable amount, and duration-based returns in seconds.
Principal Amount
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Total Interest
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Total Amount
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When dealing with loans, savings, or investments, understanding how interest works is essential. One of the simplest and most transparent ways to calculate interest is through the concept of Simple Interest. Whether you’re borrowing money or investing it, our online Simple Interest Calculator helps you figure out exactly how much you’ll pay or earn — instantly and accurately.
This guide explains what simple interest is, how it differs from compound interest, and why using a calculator makes managing your finances faster and easier.
Simple interest is calculated only on the initial amount of money — called the principal. It doesn’t take into account any previously earned interest. Because of this, the calculation remains consistent, predictable, and easy to understand.
Here’s the formula used by most simple interest calculators:
Simple Interest (SI) = (P × R × T) / 100
For example: If you invest ₹20,000 at an annual interest rate of 8% for 3 years, your simple interest will be:
(20,000 × 8 × 3) / 100 = ₹4,800
That means your total amount after 3 years will be ₹24,800.
Our Simple Interest Calculator is built to give you accurate results instantly — no manual math required. Here’s how to use it:
You’ll also get a clear visual representation showing how your interest builds over time — making it easier to understand and compare different loan or investment options.
People often confuse these two terms. Here’s the main difference between Simple Interest and Compound Interest:
For example, ₹10,000 at 10% simple interest earns ₹1,000 per year, while compound interest grows each year as the balance increases.
The Simple Interest Calculator is useful in a variety of real-world scenarios, including:
Our calculator handles both full years and partial periods (months and days) with precision. Here’s how the time component is adjusted:
T = Years + (Months / 12) + (Days / 365)
This ensures that your result stays accurate even for non-standard time durations.
Yes! Just input the number of months or days, and the calculator will automatically convert the time for accurate results.
Yes — it’s free to use for unlimited calculations, without sign-ups or hidden charges.
Absolutely! Whether you’re estimating loan interest or checking savings returns, this calculator works for both situations.
Not on this page. But you can try our Compound Interest Calculator for that.
Knowing how to calculate simple interest can help you plan your finances wisely — whether you’re saving, investing, or borrowing. Our Simple Interest Calculator makes the process fast, accurate, and accessible for everyone.
Try it now and see how much your money grows — or how much a loan will actually cost — with just a few clicks. Bookmark this page and use it anytime you need to calculate simple interest online.