Savings Goal Calculator: What to Save Each Month
Put in the amount you are saving for and the date you want it by, and the calculator works out the monthly saving that gets you there. Flip it around to find out how long your current monthly amount takes, or what a plan finishes with. Milestone dates, the split between your money and interest, and a check against your income are all included — and every figure stays in your browser.
You need to save
$415.67a month
for 5 years
Starting balance
$2,000
You pay in
$24,940
Interest added
$3,060
Final balance
$30,000
Where the balance comes from
The lower band is money you put in; the band above it is what the 4% rate you entered adds on top. Interest is assumed constant, which no real account is.
When you hit each quarter of the goal
| Milestone | Balance | Months | Roughly |
|---|---|---|---|
| 25% of goal | $7,500 | 13 | — |
| 50% of goal | $15,000 | 30 | — |
| 75% of goal | $22,500 | 46 | — |
| 100% of goal | $30,000 | 60 | — |
Dates are counted from today and rounded up to the next whole month.
What the numbers say
- Putting $416 away every month for 60 months (5 years) reaches $30,000, counting the $2,000 you already have.
- $3,060 of the final balance comes from the 4% rate you entered rather than from you — 10.2% of the total. That figure is an assumption, not a promise: a real account's rate moves, and an invested balance can fall as well as rise.
- Doubling the deadline to 120 months would drop the monthly amount to $183 — 56% less each month for the same goal.
Every figure here comes from the numbers you typed, including the interest rate — nothing is fetched, quoted or uploaded, and your inputs are remembered on this device only. Returns are not guaranteed. This is general information, not financial advice.
TL;DR
A savings goal has four moving parts: the target, what you already have, what you add each month, and how long you have. Fix any three and the fourth is arithmetic. Most calculators only solve one of them; this one solves all three of the ones you would actually ask about. If the monthly number comes back uncomfortable, the fix is nearly always the deadline rather than willpower — stretching a goal from three years to six roughly halves the monthly amount, and a little more than halves it once interest is involved. Every rate on this page is a number you type in, never one we quote.
Three questions, one equation
Everything on this page comes out of a single expression: the future value of a regular monthly deposit sitting on top of whatever you have already saved. Write P for the opening balance, C for the monthly contribution, n for the number of months and r for the monthly interest rate (the annual rate divided by twelve, then by a hundred), and the balance at the end is:
when r = 0:FV = P + C × n
The first term is your existing savings growing on their own. The second is the annuity part: each deposit earns interest for however many months are left after it lands, so the money you put in during year one does more work than the money you put in during the final year. Rearranged for the contribution, that becomes:
And rearranged for the time, using logarithms rather than stepping through the months one at a time, which keeps the answer exact instead of approximate:
Both of those divide by r, so a zero rate would blow them up. The calculator handles that case separately with the plain-cash versions — the shortfall divided by the months, and the shortfall divided by the monthly amount — which is why you can leave the rate at 0% and still get a sensible answer. Deposits are treated as landing at the end of each month, the ordinary-annuity convention that banks and spreadsheet functions both use. Paying in at the start of the month instead would give you one extra month of interest on every deposit, a difference of about one month’s interest — roughly 0.3% at a 4% rate — on a typical plan.
The deadline is the biggest lever you have
When a savings plan feels impossible, people usually attack the target — a smaller car, a cheaper wedding, a less ambitious deposit. The deadline is almost always the cheaper thing to move, and the table below is why. It shows what it takes to reach a goal of 25,000 from a standing start, at each of five deadlines, with no interest and with an illustrative 4% a year. The rate is an example only, chosen to make the shape of the effect visible; put your own account’s rate into the calculator above for figures that mean something.
| Deadline | Monthly at 0% | Monthly at 4%* | You pay in | Interest does |
|---|---|---|---|---|
| 1 year | 2,084 | 2,046 | 24,552 | 448 (2%) |
| 2 years | 1,042 | 1,003 | 24,072 | 928 (4%) |
| 3 years | 695 | 655 | 23,580 | 1,420 (6%) |
| 5 years | 417 | 378 | 22,680 | 2,320 (9%) |
| 10 years | 209 | 170 | 20,400 | 4,600 (18%) |
*Illustrative rate, not a quoted or predicted one. Amounts rounded up to the nearest whole unit; currency deliberately omitted because the ratios are the same in any currency.
Two things jump out. First, the monthly amount falls faster than the deadline stretches: going from one year to two more than halves it, because the deposits now have time to earn something. Second, the share of the goal that interest covers grows from almost nothing over a single year to a meaningful chunk over ten. For a goal you want inside two years, the rate is close to irrelevant and you should pick the account on accessibility instead. For a goal a decade out, the rate is doing real work — and so is the risk that comes with any account paying more than a savings account does.
Why the quarter marks matter more than the finish line
A five-year goal is an abstraction. The month you cross a quarter of the way is not, and that is the point of the milestone table in the calculator: it gives you four dates instead of one, and the first of them is usually close enough to feel real. Saving 400 a month towards the same 25,000 goal, here is when each quarter arrives with no interest and with the same illustrative 4%:
| Milestone | Balance | Months at 0% | Months at 4%* | Months saved |
|---|---|---|---|---|
| 25% of goal | 6,250 | 16 | 16 | 0 |
| 50% of goal | 12,500 | 32 | 30 | 2 |
| 75% of goal | 18,750 | 47 | 44 | 3 |
| 100% of goal | 25,000 | 63 | 57 | 6 |
*Illustrative rate. Months rounded up to the next whole month.
Notice that the quarters are not evenly spaced once a rate is applied. The first quarter takes the longest, because nothing has accumulated yet to earn anything; each later quarter arrives no slower than the one before it. That is compounding in its least dramatic and most practical form — not a doubling of your money, just a gradual shortening of the gaps. It is also the reason the last stretch of a long goal feels easier than the first, and why abandoning a plan at the halfway point costs you far more than the half you have saved.
The 20% line is about behaviour, not maths
If you enter your monthly income, the calculator shows the required contribution as a percentage of it and starts flagging once that passes 20%. There is nothing magic about that threshold, and it is not a rule anyone can enforce on you. It is a rough marker for where plans stop surviving ordinary life: a car repair, a dental bill, a month with two weddings in it. A plan that consumes a fifth of take-home pay has almost no slack, so the first shock breaks it, and once a savings habit is broken it very often does not restart.
The percentage is also worth reading alongside everything else that has a claim on the same income. A 15% savings plan is comfortable on its own and impossible if rent already takes 50% and loan repayments another 20%. The calculator only knows the one number you gave it, which is exactly why it phrases the flag as a prompt to look again rather than a verdict. If you want the full picture of what your month actually costs, itemise it in the emergency fund calculator first — it separates essential outgoings from optional ones and shows the surplus you genuinely have to work with.
One ordering point that comes up constantly: most planners suggest a small cash buffer before a big savings goal, so that an unexpected bill does not get charged to a credit card and quietly undo months of progress. A goal you funded by borrowing at card rates is not a goal you reached.
What this calculator does not know
Every projection here is arithmetic on the numbers you typed, and it is worth being blunt about what that leaves out:
- The rate does not hold still. A savings account rate can change with no notice, and an invested balance can fall as well as rise. The tool assumes one constant rate for the whole plan, which is a simplification, not a forecast. Returns are not guaranteed.
- Tax on interest is ignored. Depending on where you live and which account you use, some or all of the interest may be taxable, which lowers the effective rate. If you know your position, enter the after-tax rate instead.
- So is inflation.The final balance is in today’s money only in the sense that the number is right; what it buys in ten years is another question. For a long goal against a moving target — a house deposit, say — it is worth revisiting the target amount every year or two.
- Fees and minimums are not modelled. Account fees, withdrawal penalties and minimum balance rules all change the real outcome and none of them are inputs here.
- Nobody saves the same amount forever. Pay rises, pay cuts, bonuses and lean months all happen. Treat the monthly figure as a starting discipline and re-run the numbers when your circumstances move.
Which of the three savings tools you actually want
These questions sound similar and have genuinely different answers, so it is worth being clear about which page solves which:
- “I know the finish line.” This page. You have a number and usually a date, and you need the monthly amount, or the date that a monthly amount you can manage would produce.
- “I know what I am putting in.” The compound interest calculator runs the same equation forwards, with more control over compounding frequency, when the growth itself is what you are studying.
- “How much should I be holding in cash?” The emergency fund calculator answers a different question entirely: months of essential expenses covered, based on your real bills rather than a growth rate.
In practice most people need them in that last order: a buffer first, then a goal, then growth on whatever is left over.
Frequently asked questions
How much do I need to save each month to reach my goal?
Take the target, subtract what the money you have already saved will have grown to by the deadline, and spread the remainder across the months — adjusted for the fact that each deposit also earns interest for the months that follow it. That is the annuity formula the first mode uses: C = (FV − P(1+r)^n) × r ÷ ((1+r)^n − 1). With no interest it collapses to the obvious version: the shortfall divided by the number of months. The calculator rounds the answer up to the nearest cent so the plan lands on or just above the target rather than a few cents below it.
How long will it take to save for a house deposit?
Switch to the second mode, enter the deposit you are aiming for, whatever you have already put aside and what you can realistically move across each month. The answer is solved with logarithms rather than by counting months one at a time, so it is exact: n = ln((FV + C/r) ÷ (P + C/r)) ÷ ln(1+r). The milestone table then shows the month you pass 25%, 50% and 75% of the way, which in practice is the part people find most motivating — the quarter marks arrive far sooner than the finish line.
What interest rate should I put in?
Whatever your own account actually pays, which you can read off your statement or your bank’s rate page. This calculator deliberately does not suggest a figure, because rates move constantly and a number baked into a web page would be wrong within weeks. If the money is sitting in a current account earning nothing, leave the rate at zero — the maths handles that case exactly rather than dividing by zero. For a goal less than a couple of years away, the rate barely changes the answer anyway.
Is saving 20% of my income for one goal too much?
Twenty percent is the point where this calculator starts flagging the plan, and the reason is behavioural rather than mathematical. A plan that takes a fifth of take-home pay leaves very little slack, so the first unexpected bill breaks it and the habit rarely restarts. If you cross that line, the cheapest fix is almost always a longer deadline: because interest works with you over time, doubling the timeframe usually cuts the monthly amount by more than half. The tool shows exactly what that swap would cost you in time.
How is this different from a compound interest calculator?
A compound interest calculator runs forwards: you tell it what you are putting in and it tells you what you end up with. This one runs backwards from the answer you already know — the deposit, the wedding, the car — and solves for the thing you do not know, which is either the monthly amount or the number of months. The third mode does run forwards, as a sense check. If you want to model growth on a lump sum instead, use the compound interest calculator; if you want to know how many months of expenses you should be holding in cash, that is the emergency fund calculator.
Does the calculator store my figures or send them anywhere?
Nothing is uploaded. The amounts, the rate and your currency choice are saved in this browser’s local storage so the page is still filled in when you come back, and that copy never leaves the device. There is no account and no server-side calculation. The currency selector only changes formatting — symbol, decimal places and digit grouping, so rupees group as ₹1,00,000 — it does not convert between currencies, because live exchange rates would mean sending your figures to someone else’s server.
This calculator is general information, not financial advice, and it does not know your circumstances. Every rate shown on this page is either a figure you entered or an example labelled as illustrative — no rate here is quoted, predicted or recommended. Interest is assumed to stay constant, which no real account does, and returns of any kind are not guaranteed. Results are only as accurate as the amounts you enter, and they exclude tax, fees and inflation. For decisions that matter, speak to a qualified adviser regulated where you live.