Sinking fund calculator

Save monthly for known future costs.

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

Total of future costs

Months until due

Already set aside

Save each month

$458.33

Still to save

$5,500

With these inputs, save each month comes to $458.33 over 12 months. Still to save works out to $5,500.

Over time · by months until due

Input	−10%	Now	+10%
Total of future costs	$405	$458.33	$511.67
Months until due	$509.26	$458.33	$416.67
Already set aside	$465.83	$458.33	$450.83

Whatmakesequal

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

Save monthly for known future costs.

With the defaults above, save each month works out at $458.33.