Simple Interest Calculator India (2026)

Calculate the interest earned or payable on any principal amount. Estimate the total maturity value for your loans or deposits using the standard Simple Interest formula.

Calculator Inputs

Total Amount (Maturity)

₹0

Initial Principal

₹0

Total Simple Interest

₹0

Principal Amount Interest Earned
Principal: ₹0
Interest: ₹0

What is Simple Interest?

Simple interest is a quick and easy method of calculating the interest charge on a loan or the growth on an investment. Simple interest is determined by multiplying the daily or monthly interest rate by the principal amount that is borrowed or invested.

Unlike compound interest, where interest is calculated on the principal plus the accumulated interest, simple interest only calculates returns based on the original amount. This is common in short-term personal loans, car loans, and some consumer credit products in India.

Simple Interest Formula Explained

The calculation of simple interest is straightforward. The mathematical formula used is:

SI = (P × R × T) / 100
  • P (Principal): The original sum of money borrowed or invested.
  • R (Rate): The annual interest rate percentage.
  • T (Time): The number of years the money is borrowed/invested.

Difference Between Simple and Compound Interest

The primary difference lies in how the interest is applied. Simple interest is calculated once at the end of the tenure or periodically on the original amount. Compound interest, however, adds the interest back into the principal, meaning you earn "interest on interest."

For most long-term wealth creation goals, compound interest is vastly superior. You can compare these returns using our Compound Interest Calculator or plan your investments using the SIP Calculator.

Example of Simple Interest Calculation

Principal: ₹2,00,000

Rate: 12% p.a.

Time: 3 Years

Calculation:

SI = (2,00,000 × 12 × 3) / 100

Interest Earned = ₹72,000

Total Amount: ₹2,72,000

Frequently Asked Questions

What is simple interest?
It is a basic way of calculating interest where returns are generated only on the original principal amount, regardless of the time elapsed.
How do you calculate simple interest?
Use the formula (P × R × T) / 100. For monthly calculations, divide the resulting amount by 12.
What is the difference between simple interest and compound interest?
Simple interest stays flat on the principal. Compound interest reinvests previous interest to earn more returns, growing exponentially over time.
Where is simple interest used?
It is commonly used for personal loans between friends/family, short-term business credit, car loans (in some cases), and consumer durable loans.
What is principal amount?
The principal is the starting sum of money that you either borrow from a lender or invest into a financial product.
How do banks calculate simple interest?
Most modern banks use "Compound Interest" or "Reducing Balance" methods. Simple interest is usually reserved for very specific short-term overdrafts or specific credit instruments.
Can simple interest be negative?
No, interest itself is a positive charge. However, if you adjust for Inflation, your real rate of return can be negative if inflation is higher than the simple interest rate.
Is simple interest used in EMI loans?
Generally, no. EMIs are calculated using the reducing balance method. Use our EMI Calculator to see exactly how your loan installments are broken down.

Related Financial Tools

Compound Interest

SIP Calculator

EMI Calculator

CAGR Tool

Inflation

Disclaimer

Calculations are based on the standard simple interest formula. This tool is for educational purposes and does not account for bank fees or taxation on interest.

Last Updated: March 2026