Sinking Funds Calculator
A sinking fund is money you save in advance for a planned expense — holidays, car maintenance, travel — instead of putting it on a credit card when the bill lands. List your funds below to see your combined monthly contribution, which fund is driving that total, and whether each one is on pace to be fully funded on time.
Your Sinking Funds
Used only to show your combined contribution as a share of income — it never changes the figures above.
- Holiday Gifts: $1,000 remaining / 10 mo
- $100/mo
- Car Maintenance: $700 remaining / 12 mo
- $60/mo
- Travel: $2,100 remaining / 8 mo
- $250/mo
What your result means
You're contributing $410 a month across 3 funds, with $3,800 still to save in total. Travel alone is $250/mo — 61% of your combined contribution.
$250/mo (61% of your $410 total) — about $8.22 a day.
$410 a month spread across roughly 30.4 days.
$410 out of $4,000 monthly take-home pay.
Your 3 funds need a combined $421 a month to stay exactly on pace, and you're currently contributing $410. That's $11 short of the recommended pace, so some funds will fall behind unless timelines stretch or contributions rise.
Travel is doing most of the work here, at 61% of your total monthly contribution. If your budget feels tight, extending Travel's timeline by a few months would free up more room than adjusting any of your other funds.
At 10.3% of your $4,000 monthly take-home pay, your sinking funds are within the range most households can sustain alongside other goals.
How to improve your result
- Close the gap between actual and recommended contribution$11/mo
Your funds need $421/mo combined to stay exactly on pace; you're contributing $410. Closing that gap keeps every fund's deadline intact.
- Stretch the timeline on your dominant fundfrees up to $250/mo
Travel is $250/mo of your $410 total. Adding a few months to its deadline lowers its recommended monthly amount without cutting the target.
- Automate the combined monthly amount on payday$410/mo
Moving $410 into labeled savings buckets the day you're paid removes the temptation to spend it before the bill arrives.
- Reframe the total as a daily cost$13.49/day
$410 a month is about $13.49 a day — a smaller number that's easier to check against everyday discretionary spending.
- Pause or shrink your lowest-priority fund temporarilyup to $60/mo
If your combined total feels unsustainable, temporarily pausing the smallest or least urgent fund frees up cash for the ones with nearer deadlines.
- Cap combined contributions at a share of take-home paytarget ≤15% = $600/mo
At 10.3% of $4,000, you're within a common 15% guideline for planned-expense saving.
Worked examples
Two funds, tight 6-month timeline
- Fund A target/months
- $900 / 6 mo, $150 saved
- Fund B target/months
- $400 / 6 mo, $0 saved
Fund A: ($900-$150)/6 = $125/mo -> Fund B: ($400-$0)/6 = $66.67/mo -> combined = $191.67/mo
With both funds due in the same 6 months, neither dominates by much — Fund A is 65% of the total, so it's the one worth adjusting first if the combined figure feels tight.
One large fund overshadowing a small one
- Vacation target/months
- $3,000 / 10 mo, $500 saved
- Gifts target/months
- $300 / 10 mo, $0 saved
Vacation: ($3,000-$500)/10 = $250/mo -> Gifts: ($300-$0)/10 = $30/mo -> combined = $280/mo, vacation = 89% of total
Because the vacation fund is nearly nine-tenths of the combined contribution, delaying the trip by two months (to 12 months) would cut its recommended amount to about $208/mo — a bigger budget relief than touching the gifts fund.
How this calculator works, assumptions, and sources
Frequently asked questions
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Related reading
- Build a budget that actually sticksA practical framework for keeping planned expenses funded month after month.
- Why small spending feels invisibleHow small daily costs add up the same way sinking-fund contributions do.
- Audit your utility billsFind recurring costs you could redirect toward a sinking fund.
Last reviewed July 9, 2026. Spotted an error? Report it via our corrections policy.