DownloadKaro · Free online tool

Simple Interest Calculator

Quick simple interest on any amount: interest earned and total amount for a principal, rate and time period.

Use Simple Interest Calculator now — free ↗

How to use it

1. Enter the principal amount.
2. Enter the yearly rate and the time in years (fractions allowed, e.g. 1.5).
3. Press Calculate interest.

Why use this tool

• The classic school and bank formula, done instantly
• Shows interest per year for easy comparison
• Useful for personal loans between family and friends

Common questions

What is the formula?

Interest = Principal × Rate × Time ÷ 100.

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