Simple Interest Calculator
Calculate simple interest instantly. Free online simple interest calculator — enter principal, rate and time to get SI and total amount.
How to Use
- Enter the principal amount using the slider or type it in.
- Set the annual interest rate.
- Set the time period in years — see simple interest and total amount update in real time.
Formula
Simple Interest (SI) = (P × R × T) / 100
Total Amount = P + SI
Where: P = Principal | R = Rate of interest per year | T = Time in years
Example Calculation
Example: ₹10,000 at 5% p.a. for 3 years
| Calculation | Value |
|---|---|
| Principal (P) | ₹10,000 |
| Rate (R) | 5% p.a. |
| Time (T) | 3 years |
| SI = 10000 × 5 × 3 / 100 | ₹1,500 |
| Total = P + SI | ₹11,500 |
Frequently Asked Questions
Simple interest is calculated only on the principal amount, unlike compound interest which accumulates on previously earned interest too.
Simple interest is common in short-term loans, car loans, certificates of deposit, and some government bonds.
Simple interest is better for borrowers since you pay interest only on the original principal. Compound interest accumulates faster and costs more over time.