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Wondering how much you need to save each month to hit a big financial target? The Savings Goal Calculator above turns your goal into a clear monthly plan. Enter the amount you want to save, how many years you have, and the interest rate you expect to earn, and the calculator instantly shows the monthly deposit required to get you there — along with exactly how much of your final balance comes from your own contributions and how much comes from compound interest. Whether you are building an emergency fund, saving for a house down payment, or planning a dream vacation, knowing your monthly number is the single most important step between wishing and achieving.
Using the calculator takes less than a minute. Here is what each input means, and how to choose values that give you a realistic plan rather than wishful thinking.
Pro tip: run the numbers at least twice, once with a conservative rate (what a savings account pays) and once with an optimistic rate (what investing might return). That gives you a realistic range for your monthly deposit instead of a single fragile number. If even the conservative figure fits your budget, your plan is robust; if only the optimistic figure works, your plan depends on luck, and you should adjust the goal or the timeline.
A savings goal is a specific dollar amount you commit to accumulating by a specific date. “I want to save money” is a wish; “I will save $20,000 for a down payment in four years” is a savings goal. The difference matters enormously: a defined target lets you work backward to the exact monthly deposit you need, which is precisely what the calculator above computes. Financial planners consistently find that people with written, specific goals save significantly more than people with vague intentions, because a concrete number turns every spending decision into a visible trade-off.
Your monthly deposit is the fixed amount you set aside every month toward the goal. The math behind this calculator assumes you deposit the same amount at the end of each month, every month, without fail. In real life, the easiest way to honor that assumption is automation: a recurring transfer that moves the money the day after payday, before you can spend it. Treat the monthly deposit like a bill you owe your future self — non-negotiable, scheduled, and paid first.
The real engine of long-term saving is compound interest: interest earned not only on the money you deposit but also on the interest those deposits have already earned. Each month’s growth becomes part of the balance that grows the next month, creating a snowball effect that accelerates over time. Early deposits matter the most because they compound the longest — the $644 you deposit in month one of a ten-year plan earns interest for 119 more months, while the final deposit earns almost none. That is why starting ten years before you need the money can cut your required monthly deposit nearly in half compared with starting five years out, even though you are saving for twice as long.
A strong savings goal has four traits: it is specific (an exact amount), time-bound (an exact date), realistic (matched to your income and expenses), and separated from daily spending (kept in its own account). Goals missing any one of these traits tend to dissolve the first time an unexpected expense appears. Name the account after the goal — “House Down Payment,” not “Savings 2” — because a labeled account is psychologically harder to raid for impulse purchases.
The calculator uses the future value of an ordinary annuity formula — the standard equation banks and financial planners use to convert a future target into equal monthly payments:
Monthly deposit = Goal × r ÷ ((1 + r)n − 1)
Here, Goal is your target amount, r is the monthly interest rate (annual rate ÷ 12), and n is the total number of monthly deposits. If the interest rate is 0%, the formula simplifies to Goal ÷ n — you simply divide the target by the number of months. The denominator, ((1 + r)n − 1) ÷ r, is called the annuity factor; it measures how much one dollar deposited monthly grows to over the whole period, and dividing the goal by it gives the deposit needed.
Worked example 1: $100,000 goal, 10 years, 5% annual interest. The monthly rate r = 0.05 ÷ 12 ≈ 0.0041667, and n = 120 monthly deposits. The annuity factor ((1.0041667)120 − 1) ÷ 0.0041667 ≈ 155.28, so the monthly deposit = 100,000 ÷ 155.28 ≈ $643.99 — about $644 per month. Over the ten years you contribute roughly $77,278 of your own money, and compound interest supplies the remaining ≈ $22,721. Notice that interest covers nearly 23% of the goal: time in the market is doing real work for you.
Worked example 2: $25,000 goal, 3 years, 3% annual interest. Here r = 0.03 ÷ 12 = 0.0025 and n = 36. The annuity factor ((1.0025)36 − 1) ÷ 0.0025 ≈ 37.62, so the monthly deposit = 25,000 ÷ 37.62 ≈ $664.53. You would contribute about $23,923 yourself and earn about $1,077 in interest. Compare this with example 1: the monthly deposit is actually higher despite the smaller goal, because three years gives compound interest far less time to help. Timeline is the most powerful lever you have.
Scenario 1 — Emergency fund. Maya wants a $15,000 emergency fund in 18 months and keeps it in a high-yield account earning 4%. With r = 0.04 ÷ 12 ≈ 0.003333 and n = 18, the calculator gives a required monthly deposit of about $809.61. She automates a transfer of $810 on payday, and in a year and a half her safety net is fully funded — she contributed about $14,573 herself while interest added roughly $427. Because an emergency fund must be liquid and safe, she correctly chose a savings account rate rather than an investment return.
Scenario 2 — House down payment. Daniel and Priya want $60,000 for a down payment in 5 years and expect 5% annual growth in a balanced portfolio. With n = 60 and r ≈ 0.0041667, they need to invest about $882.67 per month. Their own contributions total about $52,960, and compounding adds roughly $7,040 — a meaningful head start that would have taken far longer with 0% cash savings. They revisit the calculator every six months, plugging in their actual balance as a “remaining goal” to confirm they are still on track after market ups and downs.
Keep planning with these free tools from Sigma Calculator:
This page provides a Savings Goal Calculator, a free online financial planning tool on Sigma Calculator that computes the required monthly deposit to reach a target savings amount over a specified number of years at a given annual interest rate, using the future value of an ordinary annuity formula. The page includes a step-by-step usage guide, an explanation of savings goals and compound interest, the savings goal formula with two worked numerical examples, two practical saving scenarios, five common mistakes to avoid, links to related financial calculators, and eight frequently asked questions with answers about reaching savings goals.
It depends on three numbers: your target amount, your timeline, and the interest rate you earn. Enter them into the Savings Goal Calculator above and it will show your required monthly deposit. For example, to reach $100,000 in 10 years at 5% annual interest, you would need to save about $644 per month. The longer your timeline and the higher your interest rate, the smaller your monthly deposit needs to be.
Compound interest means you earn returns not only on the money you deposit but also on the returns those deposits have already generated. Over long timelines this snowball effect does a large share of the work. For example, in the $100,000 / 10-year / 5% example above, interest contributes roughly $22,721 of the final balance, so you only deposit about $77,278 yourself. The earlier you start and the higher your rate, the more compounding shrinks your required monthly deposit.
A widely recommended first goal is a starter emergency fund of $1,000, then one month of essential expenses, and eventually three to six months of expenses. Enter each milestone into the calculator. For instance, saving $6,000 in 12 months at 4% interest needs about $490.90 per month. Tackle milestones one at a time so progress stays visible and motivating.
Match the account to your timeline. For goals under two years, such as an emergency fund or a near-term purchase, use a high-yield savings account: your money stays safe and liquid while earning around 4 to 5 percent. For goals five or more years away, a diversified investment portfolio has historically returned more, which lowers the monthly deposit the calculator requires. Never invest money you will need within a year or two, because market swings could leave you short.
Re-run the calculator with your remaining balance and remaining time. If you get a raise, keep your deposit the same and you will finish early, or raise the goal. If income drops, extend the timeline or lower the target rather than stopping entirely. Even a smaller automated deposit keeps compounding working for you. The calculator makes it easy to test these what-if scenarios in seconds.
One missed deposit rarely ruins a plan, but it costs more than the deposit itself because you also lose the compounding that deposit would have earned. The fix is simple: enter your remaining goal amount and remaining months into the calculator to get your new required monthly deposit, then resume. Consider setting up automatic transfers so a busy month cannot derail you again.
Yes. It works for any lump-sum target with a deadline. Common uses include emergency funds of three to six months of expenses, house down payments, cars, weddings, vacations, and education costs. Just enter the total you need, the number of years until you need it, and a realistic rate for where the money will sit, and the calculator returns your monthly target.
The math is exact for its assumptions: equal monthly deposits at the end of each month and a constant annual interest rate compounded monthly. Real life varies. Rates change, deposits may be uneven, and fees or taxes can reduce returns. Treat the result as a precise plan based on your inputs, and re-run the calculator once or twice a year with updated numbers to stay on track.
APA: Sigma Calculator. (2026, October 8). Savings Goal Calculator. https://sigmacalculator.net/financial-calculators/savings-goal-calculator/
MLA: “Savings Goal Calculator.” Sigma Calculator, 8 Oct. 2026, https://sigmacalculator.net/financial-calculators/savings-goal-calculator/.
Chicago: Sigma Calculator. “Savings Goal Calculator.” Last modified October 8, 2026. https://sigmacalculator.net/financial-calculators/savings-goal-calculator/.
Last updated: October 8, 2026