Money calculator
Savings Goal Calculator
Find the monthly amount needed to reach a future savings target.
Assumes monthly compounding and contributions at each month’s end. Projections are estimates, not guarantees.
Required monthly contribution
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What the calculator solves for
You enter four numbers: the goal amount, what you already have saved, how many years you're giving yourself, and the annual interest rate you expect the account to earn. The calculator converts years into months and requires that conversion to land on a whole number — 1.5 years (18 months) and 0.25 years (3 months) both work, but 0.1 years (1.2 months) is rejected because a fraction of a month isn't a valid deposit schedule.
It first grows your current savings on its own for the full term, using monthly compounding at the annual rate divided by 1200. Whatever gap remains between that grown balance and your goal is treated as the amount a series of equal, end-of-month deposits needs to close. If your current savings alone are projected to reach or pass the goal, the required contribution comes back as $0.
Current savings, goal amount, and rate can't be negative, and the goal must be greater than zero — there's nothing to solve for with a $0 target.
The compounding formula
With 0% interest the formula collapses to plain division: growing $1,000 to $7,000 in 24 months with no return needs ($7,000 − $1,000) ÷ 24 = $250.00 a month, and the annuity factor is just the month count itself.
With a positive rate the factor grows because each deposit starts earning its own interest. Reaching $10,000 in 12 months from $0 at 6% annual interest needs $810.66 a month — the sum of 12 payments of $810.66 is $9,727.97, with the account earning $272.03 in interest to cover the rest.
Why the required contribution shrinks as the rate rises
The same $10,000-in-12-months goal at 0% interest would need $833.33 a month (10,000 ÷ 12). At 6% it only needs $810.66 — $22.67 less every month — because deposits made in month one are still earning interest in month twelve. People often assume a savings goal calculator just divides the shortfall by the number of months; that shortcut is only correct when the rate is exactly zero.
A related mistake is expecting the very first deposit to earn a full term of interest. Deposits are modeled as landing at the end of each month, so the last deposit earns no interest at all and the first earns interest for only eleven of the twelve months, not twelve.
Everyday savings targets
Some concrete goals this covers, with the exact contribution the calculator returns:
- Starter emergency fund – $6,000 from zero in 12 months at 0% interest needs $500.00 a month (6,000 ÷ 12)
- Wedding fund – $15,000 in 18 months with no investment return needs $833.33 a month (15,000 ÷ 18)
- House down payment – growing $500 into $5,000 over 3 years at 4% interest needs $116.19 a month, instead of the $125.00 a flat 0% plan would require
- Short-term vacation fund – reaching $10,000 in a year at 6% interest needs $810.66 a month, $22.67 less than a 0% plan over the same year
- Goal already met – entering a $5,000 goal with $6,000 already saved returns a $0.00 required contribution and a status noting the goal is already reached
Frequently asked questions
Why does the calculator reject some values I enter for years?
Years are converted to months by multiplying by 12, and that result has to be a whole number. Entering 0.1 years produces 1.2 months, which isn't a valid number of monthly deposits, so no result is shown. Entering 0.25, 0.5, or 1.5 years works because those convert to 3, 6, and 18 whole months.
What happens if my current savings will already cover the goal?
The needed amount is floored at $0, so the required monthly contribution shows as $0.00. The status line then distinguishes two cases: your balance already meets or exceeds the goal today, or it's below the goal now but projected to grow past it through interest alone by the deadline.
Are contributions assumed to happen at the start or end of each month?
End of month. That means the final deposit in the schedule earns no interest at all, and every earlier deposit earns interest only for the months remaining after it lands — not the full term.
How much does assuming 0% interest change the required contribution?
For a $10,000 goal reached in 12 months, 0% interest requires $833.33 a month while 6% interest requires $810.66 a month — a $22.67 monthly difference on the same target, because a positive rate does part of the work for you.
Can I use this to see what a fixed monthly deposit grows into over time?
No — it solves in the other direction, finding the deposit needed to hit an exact goal by an exact date. To see what a fixed contribution grows into, you'd need a compound-growth calculator that takes a deposit amount as input instead of a target.
Why must the interest rate and current savings be zero or positive?
The compounding formula divides by the monthly rate when the rate isn't zero, and a negative balance or negative rate would produce a required contribution that doesn't correspond to any real savings plan, so both fields are restricted to zero or above.
This calculator is for informational and educational purposes only and is not financial advice. Its results are estimates that may not reflect actual rates, fees, taxes, or terms you are offered. Talk to a qualified financial professional before making financial decisions.