Interest
Simple interest calculator
Estimate interest earned or paid without compounding.
How to use this calculator
Enter Principal, Annual rate and Years. Estimate interest earned or paid without compounding. The answer updates when you change an input.
Understanding the result
Simple interest is calculated only on the original principal.
Common questions
What assumptions does this result use?
The rate stays constant; fees, taxes and compounding are excluded.
Are intermediate values rounded?
No. The calculation retains JavaScript number precision internally and formats only the displayed result unless the stated method requires a discrete whole value.