Savings Goal Calculator
Find the monthly amount to save to hit your target on time.
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Find out exactly how much to set aside each month to reach a savings goal by your target date — accounting for what you've already saved and the interest your money earns along the way.
Enter your goal, current savings, expected return, and timeframe. Everything is calculated privately in your browser.
Formula
Monthly growth factor
u = (1 + i ÷ 100f)^(f ÷ 12)
i is your annual return as a percentage and f is how many times a year it compounds — 12 for monthly, 4 for quarterly, 1 for annually. u is what one month multiplies your balance by. For monthly compounding the exponent f ÷ 12 is exactly 1, so u is simply 1 + i ÷ 1200: at 5% that is exactly 241/240, a plain fraction with no rounding in it.
Balance at the target date
FV = [ PV·uⁿ + (PMT)·(1 + u + u² + … + uⁿ⁻¹) ] · uᵖ
PV = what you have saved, PMT = the monthly deposit, n = the number of completed months, and p = the leftover fraction of a month. Deposits land at the end of each month, so 4.4 years gets 52 of them while the leftover 0.8 of a month still earns growth but no deposit. When the timeframe is a whole number of months, p is 0 and the last factor drops out. Writing the deposits as the sum 1 + u + … rather than ((uⁿ − 1) ÷ (u − 1)) means a 0% return needs no separate formula: u is 1, the sum is just n, and the answer is (goal − saved) ÷ n.
The figure shown
smallest whole cent c with FV(c) ≥ goal
A deposit can only be paid in whole cents, so the precise requirement usually can't be quoted. The amount is rounded up rather than to the nearest cent, because rounding down would name a figure that falls short of your goal. What you see is the smallest whole cent that reaches the goal under the formula above — for every compounding frequency, and for terms that end part-way through a month as well as whole ones. A cent less always falls short. Where the arithmetic cannot settle that to the cent, the calculator says so rather than showing a figure it cannot stand behind.
Examples
| Example | Input | Result |
|---|---|---|
| $50k in 5 yr | $5k saved, 5% | ≈ $640.88/mo |
| No return | $50k − $5k over 60 mo | $750/mo |
| Already there | current ≥ goal | $0/mo |
How to use the savings goal calculator
- 1Enter your savings goal and how much you've already saved.
- 2Set your expected annual return, the time to your goal, and the compounding frequency.
- 3Read the monthly contribution needed, plus the year-by-year growth table.
How compound growth helps you save
When your savings earn a return, you don't have to contribute the full goal yourself — interest does part of the work, and the longer your timeframe, the bigger that share becomes. This calculator back-solves the monthly contribution so that your current savings, your deposits, and the compounding return add up to your goal on schedule.
Time and rate matter most
Two levers move your required contribution the most: time and rate. A longer horizon spreads the goal across more months and gives compounding more room to work, sharply lowering the monthly amount. A higher (realistic) return does the same. Try adjusting the years and rate above to see how much easier a goal becomes with time.
This calculator provides estimates for educational purposes only and is not financial advice. Investment returns are not guaranteed and vary with market conditions. Consult a qualified financial professional for personal guidance.
Frequently asked questions
How much do I need to save each month to reach my goal?
It depends on your goal, what you've already saved, your expected return, and your timeframe. The calculator back-solves the monthly contribution so everything adds up to your goal on time — enter your numbers above.
What is compound interest and how does it help savings?
Compound interest is earning returns on both your contributions and the returns they've already generated. Over time it means a growing share of your goal is funded by growth rather than your own deposits, lowering the amount you need to contribute.
How does the interest rate affect my savings goal?
A higher expected return reduces the monthly contribution you need, because your money does more of the work. Even a couple of percentage points can make a meaningful difference over several years.
What is a realistic annual return for savings?
It depends where you save. High-yield savings accounts and CDs offer lower, safer returns; diversified long-term investments have historically averaged more but carry risk and volatility. Use a rate you're comfortable relying on for your timeframe.
How long will it take to save $X?
Lengthening your timeframe lowers the monthly amount needed and lets compounding do more. Adjust the “time to goal” field to see how the required monthly contribution changes for your target.
What is the difference between simple and compound interest?
Simple interest is earned only on your original principal; compound interest is earned on the principal plus all previously earned interest. Compounding accelerates growth over time, which is why it matters so much for long-term savings.
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