Lump sum against debt calculator

Apply a windfall to a balance.

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

Balance

Rate

11%

Monthly payment

Lump sum

Interest saved

$2,831

Months saved

1 yr 4 mo

With these inputs, interest saved comes to $2,831. Months saved works out to 1 yr 4 mo. The result assumes rate stays at 11%.

What moves the number · Interest saved

Input	−10%	Now	+10%
Balance	$2,367	$2,831	$3,357
Rate	$2,411	$2,831	$3,302
Monthly payment	$3,353	$2,831	$2,450
Lump sum	$2,596	$2,831	$3,056

Whatmakesequal

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

Apply a windfall to a balance.

With the defaults above, interest saved works out at $2,831.