BloominSinking fund calculator
A sinking fund is money you set aside a little at a time for a cost you know is coming. To plan several at once, divide what each still needs by the months before its date, then add those amounts up and compare them with your budget.
Add your funds below to see how one budget splits across them.
Your funds need a month
$262.08
Your budget of $300 covers it, with $37.92 left over.
Car insuranceOn time
Needs $128.58, gets $128.58. Done May 7, 2027.
Holiday giftsOn time
Needs $54.55, gets $54.55. Done Sep 7, 2027.
TripOn time
Needs $78.95, gets $78.95. Done May 7, 2028.
No interest is added. Every number here is plain arithmetic.
To improve these tools, we keep a rounded copy of the numbers and choices you enter. Names you type are kept only if they're common ones like Rent or Vacation. None of it is linked to your name or email. What we keep
How the split works
For each fund, the calculator counts the deposits between today and its date and divides what's left by that number. If your budget covers the total, every fund gets what it needs and the rest shows as left over. If it doesn't, the budget is shared in proportion to need, so every fund keeps moving, and the ones that would finish after their date are marked.
What it won't decide for you
It doesn't rank your funds. A bill with a fixed date may matter more to you than a trip, or the other way round. Move a date, lower an amount or raise the budget and the split updates. No interest is added.
Read next
Questions
What is a sinking fund?
Money you set aside a little at a time for a cost you know is coming: an insurance bill, holiday gifts, a trip, car repairs. When the bill arrives, the money is already there.
How do I calculate a sinking fund?
Take what the cost will be, subtract what you've saved, and divide by the months before you need it. A $900 bill in 9 months needs $100 a month.
What if my budget doesn't cover every fund?
The calculator shares it in proportion to what each fund needs and marks the funds that would finish late. Which fund comes first is your decision; changing a date, an amount or the budget shows the effect.
Is a sinking fund the same as an emergency fund?
No. A sinking fund is for a cost you can see coming. An emergency fund is for the ones you can't, so it needs to stay reachable.