₹10,000 at 5% for 2 years
Inputs
- principal
- 10000
- rate
- 5
- time
- 2
- timeUnit
- years
Result
Simple Interest = ₹1,000 and Total Amount = ₹11,000.
Finance
Simple Interest Calculator
Calculate simple interest and the total amount based on the principal, interest rate, and time period.
Simple Interest Calculator calculator
SI
Simple Interest Calculator
Enter the values below to calculate your result.
₹
%
SI
Your result will appear here
Enter the required values and click Calculate to see your result.
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How does the simple interest calculator work?
Enter the principal amount, annual interest rate, time period, and time unit. The calculator converts months into years when necessary, then calculates simple interest using the principal, annual rate, and time. The interest is added to the principal to determine the total amount.
Formula
Simple Interest = (Principal × Rate × Time) ÷ 100Examples
₹20,000 at 6% for 12 months
Inputs
- principal
- 20000
- rate
- 6
- time
- 12
- timeUnit
- months
Result
Simple Interest = ₹1,200 and Total Amount = ₹21,200.
₹50,000 at 8% for 3 years
Inputs
- principal
- 50000
- rate
- 8
- time
- 3
- timeUnit
- years
Result
Simple Interest = ₹12,000 and Total Amount = ₹62,000.
About this calculator
A simple interest calculator helps you quickly calculate the interest earned or payable on a principal amount over a specific period.
Simple interest is calculated only on the original principal amount. Unlike compound interest, previously earned interest is not added to the principal for future interest calculations.
To calculate simple interest, multiply the principal amount by the annual interest rate and the time period in years, then divide the result by 100.
This calculator allows you to enter the time period in either years or months. When months are selected, the period is converted into years before the calculation is performed.
You can use a simple interest calculator to estimate interest on certain loans, deposits, short-term financial arrangements, and other calculations where simple interest applies.
Frequently asked questions
What is simple interest?
Simple interest is interest calculated only on the original principal amount. The accumulated interest does not become part of the principal for future calculations.
What is the formula for simple interest?
The formula is Simple Interest = (Principal × Rate × Time) ÷ 100, where the annual interest rate is expressed as a percentage and time is measured in years.
How do I calculate simple interest?
Multiply the principal amount by the annual interest rate and the time in years, then divide by 100. Add the resulting interest to the principal to get the total amount.
Can I calculate simple interest for months?
Yes. Enter the time in months and the calculator converts the period into years automatically before calculating the interest.
What is the difference between simple and compound interest?
Simple interest is calculated only on the original principal, while compound interest also calculates interest on previously accumulated interest.
What happens if the interest rate is 0%?
If the interest rate is 0%, no interest is calculated and the total amount remains equal to the original principal.
Does a longer time period increase simple interest?
Yes. When the principal and interest rate remain the same, simple interest increases proportionally as the time period increases.
Can I use this calculator for loans?
Yes, but only when the loan uses a simple-interest calculation. Many standard loans use amortization or compound-interest-based calculations instead.
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