Simple Interest Calculator

Calculate interest earned only on the original principal.

Your result

Updated now

—

Enter your numbers.

Behind the answer

How to calculate

Interest = principal × annual rate × years

10,000 at 5% simple interest for 3 years earns 1,500.

No compounding, fees, tax or inflation are included.

Results display up to 8 decimal places; exported numbers preserve calculation precision. This is a calculation summary, not an official certificate.