Works out the deposit needed to hit a target by a date, with interest.
How to read the results
The starting balance is grown to the target date, then the shortfall is annuitised over the months.
Sinking fund calculator
Works out the deposit needed to hit a target by a date, with interest.
Built and reviewed by Dovanic, Founder and editor, FreeByteLast reviewed: 2026-08-18
$
$
36 mo
3.0%
Save per month
$391
Interest earned
$282
- Starting balance grows to
- $3,282
- Still to fund
- $14,718
- Per week
- $90
- Total deposited
- $14,084
Methodology
The starting balance is grown to the target date, then the shortfall is annuitised over the months.
- · Interest compounds monthly.
- · Assumes no missed deposits.
Estimates only. Nothing here is financial advice. Spotted something wrong? Tell us and it gets fixed.