Principal repaid in a payment calculator

A debt payment first covers period interest; the remaining amount reduces principal.

P_{\text{repaid}} = A_{\text{pay}} - I

Calculator

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

Given

P_{\text{repaid}} = 28{,}000 - 9500 = 18{,}500

Symbol	Meaning	Unit
$P_{\text{repaid}}$	principal repaid this period	$
$A_{\text{pay}}$	total period payment	$
$I$	interest portion	$

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