Estimate non-compounding interest for straightforward loans and short-term notes.
Overview
Simple interest applies interest only to the original principal.
It is common in short notes, basic lending examples, and quick estimates.
Unlike compounding, interest does not earn additional interest here.
The model is transparent and easy to validate manually.
Steps
Input original borrowed or invested amount.
Use percentage converted to decimal for calculations.
Set duration in years or convert months to years.
Calculate interest amount with linear formula.
Get total amount due or receivable.
Math
I = P × r × t
Simple interest equals principal times annual rate times time, without compounding.
Worked cases
I = 5,000 × 0.08 × 1
Interest is $400; total due is $5,400.
I = 10,000 × 0.06 × 1.5
Interest is $900.
Simple model vs compound model.
Compound interest produces a higher ending amount.
Why use this
Questions