Simple Interest Calculator

Calculate simple interest (si) with this accurate, fast, and easy to use calculator. Just enter the starting balance, rate of interest, and time period to get precise results instantly.

three people analyzing simple interest chart

The starting balance is the amount of funds/money in an account at the beginning.


The interest rate is a percentage value that is paid or received on the starting balance.


The tenure is the time period which tells you for how many years you will earn or pay the simple interest.

Final Balance


Interest Gained


Initial Amount


Monthly Interest


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Common questions about Simple Interest

How is simple interest calculated with formula

A = P(1 + rt)


A is the final amount.

P is the initial principal amount.

r is the annual interest rate.

t is the time in years.

From this, we get to know that your Interest value depends on 3 factors: The initial principal amount, annual interest rate, and the time.'s main purpose is to provide fast, helpful, convenient, and 100% free online calculators in various categories. Currently, we have around 20 calculators to help you do quick calculations in categories such as fitness, finance, health, math, temperature, and others, and we are developing new calculators every week.
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