Simple interest calculator
Calculate simple interest and the total amount for a loan or deposit.
🔒 Everything runs in your browser. Nothing you choose or type is uploaded. How to verify
Drop files here or tap to choose
How to use it
- Enter the principal.
- Enter the yearly rate and number of years.
- Read the interest and total, which update as you type.
Handy for
Short-term loans, bonds and school maths.
Good to know
Years can be fractions, such as 0.5 for six months.
Privacy: where the work happens
Everything you enter or choose is processed by JavaScript in your browser and never sent anywhere. Only the page code, and any library this tool needs, is downloaded from cdnjs or jsDelivr.
Questions
What is the formula?
Interest equals principal times rate times years, divided by 100 for a percentage rate.
How is it different from compound interest?
Simple interest is always calculated on the original amount only.