Simple Interest Calculator
Easily calculate your Simple Interest and End Balance in seconds with our smart, mobile-friendly Simple Interest Calculator.
Just enter your Principal Amount, Interest Rate, and Time Period (in years) — and the calculator instantly gives you a detailed breakdown with step-by-step calculation and interactive charts!
all fields are mandatory
% per year
years
% per year
years
Simple Interest Calculator formula
- The calculator uses the standard Simple Interest formula:
- Simple Interest = ( P×R×T ) / 100
- Where:
- P = Principal Amount
- R = Rate of Interest (per year)
- T = Time Period (in years)
- To get your End Balance, we use:
- End Balance=P+Simple Interest
- So, if you invest ₹2,000 at 3% interest for 10 years:
Simple Interest = (2000 × 3 × 10) / 100 = ₹600
End Balance = ₹2000 + ₹600 = ₹2600
How to Use the Online Simple Interest Calculator
- Enter the Principal Amount — the amount you invest or borrow.
- Enter the Interest Rate — annual rate of interest (in %).
- Enter the Term — number of years.
- Click Calculate.
Instantly, you’ll see: - Total Interest Earned
- End Balance
- Step-by-step calculation
- Interactive graphs showing your results.
Key Features of Our Free Simple Interest Calculator
- Multi-Currency Support – Choose between INR (₹), USD ($), EUR (€), or GBP (£) before calculating.
- Step-by-Step Explanation – See exactly how your total interest and end balance are calculated.
- Instant Graphs – Get a bar chart for year-wise accumulation and a pie chart for principal-interest breakdown.
- Responsive Design – Works beautifully on both desktop and mobile devices.
- Accessible & Easy to Use – Keyboard-friendly input fields, focus highlights, and clear form structure.
- Clear & Reset Options – Instantly reset your inputs and results for new calculations.
Why Use This Free Simple Interest Calculator?
- Whether you’re comparing bank deposits, planning a short-term investment, or checking interest returns, this calculator provides clear, instant, and visual results — no manual math needed!
What is Simple Interest?
- Simple Interest (SI) is the easiest way to calculate the interest earned or paid on a fixed principal amount over a period of time at a specific rate of interest.
- Unlike compound interest, it doesn’t add interest on top of previous interest — it stays constant every year.
Frequently Asked Questions (FAQ) — Simple Interest Calculator Online
- 1. What is a Simple Interest Calculator?
- A Simple Interest Calculator is a free online tool that helps you calculate the interest earned or payable on a principal amount for a fixed time and rate of interest.
It uses the formula SI = (P × R × T) / 100, making it easy to find your total interest and end balance without manual math.
- 2. How do I use the Simple Interest Calculator online?
- To use our online SI calculator, simply:
- Enter your Principal Amount (P)
- Enter the Rate of Interest (R) per year
- Enter the Time Period (T) in years
- Click Calculate
You’ll instantly get your total interest, end balance, and detailed calculation steps along with interactive graphs.
- 3. What is the formula used in this calculator?
- The calculator uses the Simple Interest formula:
- Simple Interest=P×R×T100\text{Simple Interest} = \frac{P \times R \times T}{100}
- and
- End Balance=P+Simple Interest\text{End Balance} = P + \text{Simple Interest}
- where P is Principal, R is Rate of Interest, and T is Time Period.
- 4. What’s the difference between Simple Interest and Compound Interest?
- Simple Interest (SI) is calculated only on the original principal amount.
- Compound Interest (CI) is calculated on both the principal and previously earned interest.
That’s why compound interest grows faster than simple interest.
If you only need fixed yearly returns or want to check loan interest manually, use the Simple Interest Calculator.
- 5. Can I calculate monthly or daily simple interest?
- Yes ✅ You can calculate monthly or daily simple interest by converting the time period:
- For months: use
T = number of months ÷ 12 - For days: use
T = number of days ÷ 365
Enter that value in the calculator, and it will show accurate results.
- 6. Does this calculator support different currencies?
- Yes, our online simple interest calculator supports multiple currencies — INR (₹), USD ($), EUR (€), and GBP (£).
The currency symbol updates automatically based on your selection.
- 7. Can I see a graph of my simple interest calculation?
- Absolutely! 🎯
Our calculator shows two visual charts: - A bar graph for yearly balance accumulation
- A pie chart showing the principal vs. interest breakdown
- These visuals help you easily understand how your money grows over time.
- 8. Is this calculator suitable for loans and deposits?
- Yes! You can use this SI calculator for loans, savings, and fixed deposits.
It’s ideal for: - Estimating loan interest payable
- Checking bank deposit returns
- Planning short-term investments
- Learning simple interest calculations for students and finance beginners
- 9. Do I need to install anything to use this calculator?
- No installation needed 🚫
This is a 100% free online calculator — it runs directly in your browser and works on mobile, tablet, and desktop without any app or signup.
- 10. Is my data saved or shared?
- No ❌ — your inputs are not stored or shared.
All calculations are done locally in your browser for your privacy and convenience.
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