Financial
Simple Interest Calculator
Interest without compounding — useful for short-term loans and bonds.
Inputs
Simple Interest Calculator
$
%
years
Result
Total interest
$750.00
- Final balance
- $5,750.00
How it's calculated
I = P · r · t
When simple interest applies
Simple interest ignores compounding — interest is charged only on the original principal. It's common for short-term personal loans, some auto loans, certain bonds, and back-of-envelope estimates. For anything longer than a year or with reinvested earnings, use the Compound Interest Calculator instead — the results diverge quickly.
Related tools
Comparing a simple-interest loan quote against an amortizing one? Run the same principal and rate through the Loan Calculator to see the true monthly payment and total cost.