Extra payment calculator

What a small extra payment each month does.

Built and reviewed by Dovanic, Founder and editor, FreeByteLast reviewed: 2026-08-18

Balance

Rate

9.9%

Current payment

Extra each month

Interest saved

$1,145

Time saved

1 yr 2 mo

With these inputs, interest saved comes to $1,145. Time saved works out to 1 yr 2 mo. The result assumes rate stays at 9.9%.

What moves the number · Interest saved

Input	−10%	Now	+10%
Balance	$871	$1,145	$1,481
Rate	$967	$1,145	$1,347
Current payment	$1,479	$1,145	$914
Extra each month	$1,058	$1,145	$1,229

Whatmakesequal

Save this set of inputs, change something, then save again to compare the outcomes side by side.

What a small extra payment each month does.

With the defaults above, interest saved works out at $1,145.