Simple Interest Calculator
Interest that doesn't compound — calculated only on the original amount, every period.
Principal
at
%/yr
for
years
Simple vs. compound interest
interest = principal × rate% × years
Example: $1,000 at 5% for 3 years → $150 interest, $1,150 total — exactly 3× one year's interest, since simple interest never earns interest on itself. Compare this with the Compound Interest Calculator, where interest compounds and the total grows faster over time.