Unit Converter
Simple Interest Calculator
Calculate simple interest and ending balance from principal, annual rate, and time.
Formula and usage notes
simple interest = principal x rate x years.
Calculate simple interest and ending balance from principal, annual rate, and time.
Practical examples
2500 at 6% simple interest for 3 years earns 450.
Simple interest does not add earned interest back into principal.
Use compound interest for most savings and loan comparisons.
Frequently asked questions
What inputs does this calculator need?
Principal, Annual rate, Years.
How should I round the result?
Keep extra digits while comparing values, then round for the final decision or report.
Can I reuse the result in another calculation?
Yes, but preserve the original inputs and units so the next calculation stays traceable.