Simple Interest Calculator
Calculate interest using the basic SI formula: SI = P × R × T / 100.
Breakdown
Principal
₹1,00,000
Interest
₹40,000
Total
₹1,40,000
What is Simple Interest?
A Simple Interest Calculator helps determine the interest earned or payable on a principal amount over a fixed period, where interest is calculated only on the original principal and not on previously earned interest.
Unlike compound interest, simple interest does not accumulate interest on interest, making the calculation straightforward and easy to understand.
How Simple Interest Works
In simple interest calculations, the interest amount remains constant for each period because it is always calculated on the original principal.
For example, if you invest ₹1,00,000 at 10% interest for 3 years, the interest is calculated on ₹1,00,000 each year, regardless of how long the money remains invested.
Constant Interest
Same interest amount earned every period
Original Principal Only
Interest calculated only on the initial amount
Linear Growth
Investment grows at a steady, predictable rate
Calculation Method
Formula:
Where:
- P = Principal amount
- R = Annual interest rate (%)
- T = Time period in years
Assumptions:
- ✓ Interest on original principal only
- ✓ No compounding
- ✓ Total Amount = Principal + SI
Key Benefits
Easy Calculation
Simple and straightforward formula
Predictable Returns
Consistent interest amount every period
Short-Term Use
Commonly used for short-term loans or investments
Transparent
Easy to understand the true cost of borrowing or returns
Important Disclaimer
This calculator provides estimated values for educational and planning purposes only. Actual interest calculations may vary depending on lender policies, compounding rules, and financial product terms.
Always review the official terms before making financial decisions.