Simple Interest Calculator

Calculate simple interest and the final amount from principal, rate and time.

Principal

Currency

Annual rate (%)

Time (years)

Results update automatically as you change the values.

Final amount

$0.00

Interest$0.00

Simple interest formula

Simple interest is calculated only on the original principal. The formula is I = P × r × t.

$10,000Principal example

5%Annual interest example

3 yearsTime period example

Simple interest is calculated only on the original principal. The formula is I = P × r × t. Unlike compound interest, previously earned interest does not itself earn additional interest.