Free finance calculator

Simple Interest Calculator

Calculate simple interest and total amount instantly from the principal, interest rate and time period.

Enter your details

₹1,00,000
8.5%
5 yr

Your result

Simple interest
₹42,500.00
Principal amount ₹1,00,000
Interest earned / payable ₹42,500.00
Total amount ₹1,42,500.00
Interest rate 8.5%

This calculator uses the standard simple-interest formula. Actual interest may differ when a financial product uses compounding, fees, taxes or other terms.

How is simple interest calculated?

Simple interest is calculated only on the original principal amount for the selected period.

Simple interest formula

Simple Interest = (P × R × T) ÷ 100
  • P = principal amount
  • R = annual interest rate in percent
  • T = time period in years

What is simple interest?

Simple interest is interest calculated on the original principal rather than on accumulated interest.

Example

If you invest or borrow 100,000 at 8.5% simple interest for 5 years, the interest is 42,500 and the total amount is 142,500 in the selected currency.

Where can it be used?

It can be useful for basic interest estimates, short-term borrowing, lending calculations and educational purposes.

Frequently Asked Questions

What is simple interest?

Simple interest is interest calculated on the original principal amount for a specified time period at a specified rate.

What is the simple interest formula?

The standard formula is Simple Interest = (Principal × Rate × Time) ÷ 100 when the rate is expressed as a percentage per year and time is measured in years.

What is the difference between simple and compound interest?

Simple interest is calculated on the original principal, while compound interest also takes accumulated interest into account according to the compounding frequency.

Does this calculator include compound interest?

No. This tool calculates simple interest only. Use a compound interest calculator when interest is added to the balance and subsequently earns interest.

Can I use this for a loan?

You can use it for a basic simple-interest estimate, but many loans use reducing-balance or other repayment methods. Check the lender's terms before relying on the result.

How to use this calculator

What to enter

Enter or select the following as requested: Currency Display only; Principal amount ₹1,00,000; Annual interest rate 8.5%; Time period 5 years. Follow the units, valid ranges, examples, and options displayed beside each field.

What the result means

The financial result is an estimate from the amounts, rates, dates, and periods entered. Check whether the rate is annual or periodic, how compounding and fees are handled, and whether taxes or inflation are included.

When to use it

Use this to compare financial scenarios with consistent assumptions. Verify current contract terms, tax treatment, and fees before making a financial commitment.