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Sinking Fund Calculator

Plan monthly savings for an annual or future bill.

Tool inputs stay in your browser · optional AI search sends your query

Good to know: Divide the remaining bill by months until it is due. Unlike an emergency reserve, this funds a known expense. No investment return or inflation assumption.

How to use it (step by step)

  1. 1Fill in the boxes: “Future bill amount”, “Already reserved”, “Months until bill”. Example numbers are already there so you can see how it works; replace them with yours.
  2. 2The result updates instantly as you type (on a phone it is below the boxes).
  3. 3The bold line is the main answer. Tap Copy next to any value to copy it.

Words to know

Tip / salary / unit price
An everyday estimate: type your own numbers and the tool does the math. Always round up a little for real-life purchases.
Inflation
Prices slowly going up over time, so the same money buys less each year.

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