Sinking Fund Monthly Calculator
How much to save monthly for a known future expense.
Enter your values
Enter the target amount in $.
Enter the months available you are working with.
Enter the already saved in $.
Enter the savings apy in %.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Save each month
- $295.32
- Amount still needed
- $5,469.13
- Interest earned
- $184.19
- Per week
- $68.15
Quick answer
Divide the target by the months available, adjusted for interest earned on the growing balance.
payment = FV x r / ((1+r)^n - 1)
At a glance
| What it does | How much to save monthly for a known future expense. |
|---|---|
| Category | Finance |
| Inputs needed | Target amount, Months available, Already saved, Savings APY |
| Main output | Save each month |
| Formula | payment = FV x r / ((1+r)^n - 1) |
| Cost | Free — no sign-up, no download |
How to use the Sinking Fund Monthly Calculator
- 1Enter the amount you need and the date it is due, in months.
- 2Include anything you have already set aside.
- 3Automate the monthly transfer the day after payday.
Inputs explained
- Target amount($)
- Enter the target amount in $.
- Months available
- Enter the months available you are working with.
- Already saved($)
- Enter the already saved in $.
- Savings APY(%)
- Enter the savings apy in %.
Worked example
Using the values the calculator loads with:
Inputs
- Target amount6000 $
- Months available18
- Already saved500 $
- Savings APY4 %
Results
- Save each month$295.32
- Amount still needed$5,469.13
- Interest earned$184.19
- Per week$68.15
Frequently asked questions
What should I sink-fund?
Insurance premiums, car maintenance, holidays and annual subscriptions.
Where should the money sit?
A separate high-yield savings account so it is not spent by accident.
What do I need to enter into the Sinking Fund Monthly Calculator?
Just 4 values: target amount, months available, already saved, savings apy. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Sinking Fund Monthly Calculator work out the answer?
Divide the target by the months available, adjusted for interest earned on the growing balance. It applies the formula payment = FV x r / ((1+r)^n - 1) and shows the working so you can check each step by hand.
Is the Sinking Fund Monthly Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.