How this sinking fund calculator works
The calculator compares each target amount with current savings, counts the contribution periods until the due date, then estimates the regular contribution needed for each fund.
Contribution frequency
Contributions can be weekly, fortnightly or monthly. Each fund also shows a monthly equivalent so multiple planned expenses can be compared in one total.
Optional interest assumption
The default interest assumption is 0%. If you enter an annual interest or APY estimate, it is used only as a projection assumption and is not guaranteed.
What this calculator does not include
This is a general planning estimate only. It does not recommend accounts, guarantee interest, model tax rules, judge affordability or provide financial advice.
Key terms and assumptionsSinking fund targets, due dates, contribution frequency, monthly equivalent, optional interest and region settings.
- Sinking fund
- A sinking fund is money set aside gradually for a known future or irregular expense.
- Target amount
- Target amount is the planned cost for each fund.
- Due date
- Due date is when the money is expected to be needed. Past due dates are shown with a warning.
- Contribution frequency
- Contribution frequency controls whether the required amount is shown weekly, fortnightly or monthly.
- Monthly equivalent
- Monthly equivalent converts each fund contribution into a monthly amount so totals can be compared.
- Interest assumption
- Optional APY or annual interest is an estimate only, is not guaranteed and may not reflect taxes, fees or account rules.
- Region settings
- Region settings change defaults, date formatting and currency formatting only. They do not convert exchange rates or create country-specific results.
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FAQs
What is a sinking fund?
It is money set aside over time for a planned expense or irregular cost.
How is this different from an emergency fund?
A sinking fund is for expected costs. An emergency fund is usually for unexpected costs.
Can I add more than one fund?
Yes. You can add multiple planned expenses and see a combined monthly equivalent.
Does this include interest?
It can include an optional APY or interest assumption, but 0% is the simple default and returns are not guaranteed.
What if the due date has already passed?
The calculator shows a warning rather than a contribution estimate for that row.
What if I already have enough saved?
The fund is shown as already covered based on the target entered.
Does region convert currencies?
No. Region changes labels, defaults and formatting only. It does not perform exchange-rate conversion.
Is this financial advice?
No. It is a planning estimate based on the values entered, not financial, tax, legal, accounting, investment or debt counselling advice.