About this calculator
Calculate simple interest and final balance.
Simple interest does not compound previously earned interest.
Formula
Interest = principal × annual rate × years.
Example
10,000 at 5% simple interest for 3 years = 1,500 interest.
Accuracy
NUMTX shows the assumptions next to the calculation so you can replace defaults with values that match your situation. For measurements, supplier rates, fees, interest, tax or regulated work, confirm important figures with the appropriate official or professional source.