Simple interest amount calculator

Interest accrues on the original principal alone; the rate and duration must share a period.

I = P \times i \times n

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Given

I = 100 \times 0.08 \times 10 = 80

Symbol	Meaning	Unit
$I$	accumulated simple interest	$
$P$	principal	$
$i$	discount rate per period	decimal
$n$	number of periods	periods

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.