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Savings Calculator
Saving toward something specific, or curious where the habit leads? This savings calculator projects the future balance of your monthly savings at a given APY — or takes a target and solves how much to put away each month, or how long it will take.
See how this works on a $10,000 savings balance — 3 real examples
Future balance
$0
Total contributions
$0
Interest earned
$0
Initial deposit
$0
Effective annual yield (APY): —
Same ending balance either way — only the share each stretch of years claims.
- — If each third of the years built an equal share
- —
- —
- —
Growth over time
Year-by-year growthDeposits, interest and balance each year
| Year | Deposits | Interest | End balance |
|---|
How this savings calculator projects growth and solves your goal
Projecting a future balance combines a lump sum with a stream of level monthly deposits. The standard future-value formula is:
FV = P (1 + i)n + PMT · ((1 + i)n − 1) / i
where P is your starting balance, PMT the monthly deposit, n the number of months, and i the exact effective monthly rate. Because the account may compound daily, monthly, quarterly, annually or continuously while you deposit monthly, the rate is converted precisely: i = (1 + r/m)m/12 − 1 (or i = er/12 − 1 for continuous compounding), so the two frequencies never drift apart. End-of-month deposits follow the ordinary-annuity form; start-of-month deposits earn one extra period each.
Reach a goal mode inverts that same equation. To find the deposit needed, it solves PMT so that FV equals your target after n months. To find the time, it solves for n given your fixed deposit. If your starting balance already grows past the target on its own, the required deposit is $0; if a fixed deposit and a 0% rate can never reach the target, the tool says so rather than showing an impossible date. The effective APY shown is the true annual yield of the nominal rate at your chosen compounding frequency ((1 + r/m)m − 1). No taxes or inflation are applied — enter an after-tax rate if you want a real-terms estimate.
One $10,000 start, three questions
The same account — $10,000 earning 4.5% — asked three different ways. Each mode answers a question the others can't.
The habit: $500 a month for ten years
after ten years$91,269
- Ten years of $500 deposits put in $60,000 on top of the opening $10,000.
- Interest contributes $21,269 — the account earns more than double its own opening balance.
- The balance ends at $91,269; nearly a quarter of it arrived as interest, not deposits.
No goal, no target — one automated habit, left alone for a decade.
Load this example (opens in a new tab)The goal: $50,000 in ten years
per month needed$227.05
- Reaching $50,000 from a $10,000 start takes $227.05 a month — less than half the projection's $500.
- Those deposits add up to $27,246 over the decade.
- Interest fills in the last $12,754 of the target.
Name the number first and the monthly deposit stops being a guess.
Load this example (opens in a new tab)The clock: $500 a month toward $50,000
to reach the goal5 yrs 6 mo
- At $500 a month, the $50,000 mark falls in five and a half years, not ten.
- Doubling scenario B's $227.05 deposit buys back about four and a half years of waiting.
- The same inputs as the projection; only the question changed, from balance to time.
Time is the third dial: hold the deposit fixed and the calendar becomes the answer.
Load this example (opens in a new tab)Illustrations only, not financial advice. Your own rate, taxes and insurance will differ — check with a qualified financial advisor before acting on any of this.
Saving toward a number, in plain English
- Start from the goal, not the guess. If you know the number you need, switch to “Reach a goal” and let the monthly savings amount fall out — no trial and error.
- APY is the number that counts. Compare accounts by annual percentage yield, which already folds in compounding; a headline rate without the compounding frequency is only half the story.
- Consistency beats timing. A steady monthly deposit does more than chasing a slightly higher rate or perfect market timing — automate it and leave it alone.
- Time does the heavy lifting. The longer your horizon, the larger the share of your final balance that comes from interest rather than your own deposits.
- Keep it liquid and insured. A high-yield savings account or CD keeps goal money safe and FDIC-insured while still earning a real return.
Related calculators
Frequently asked questions
How much should I save each month to reach my goal?
Switch this savings calculator to “Reach a goal,” enter your target balance and a horizon, and it solves the exact monthly deposit needed. For example, growing $10,000 into $50,000 in 10 years at a 4.5% APY takes about $250 a month — the calculator recalculates instantly as you change the rate or timeline.
How is savings account interest calculated?
Interest is applied to your whole balance each compounding period — your starting deposit, every contribution so far, and all interest already earned — then that larger balance earns the next round. This is compound interest, and it is why the growth curve steepens the longer you leave the money untouched.
What is APY and why does it matter?
APY (annual percentage yield) is the real yearly return after compounding is baked in, so it is the number to compare accounts by. A 4.5% nominal rate compounded monthly works out to about a 4.59% APY. If your account quotes an APY, set the compounding frequency here to “Annually” so the figure is applied exactly as the yield.
How does compounding frequency affect my savings growth?
More frequent compounding grows your balance slightly faster because interest starts earning interest sooner, but the effect is small. On a 4.5% account, moving from annual to daily compounding adds only about a tenth of a percentage point of yield. The rate, how much you contribute, and how long you save matter far more.
How long will it take to reach my savings goal?
Choose “Reach a goal,” then “Solve time,” and enter what you can save each month — the calculator returns the number of years and months to hit your target. Saving $500 a month on top of a $10,000 balance at 4.5% reaches $50,000 in roughly 5 years and 8 months. Saving more, or earning a higher APY, shortens it.
Is a high-yield savings account worth it?
Usually yes for money you want to keep liquid and safe. A high-yield savings account paying 4–5% APY earns many times more than a traditional account near 0.5%, with the same FDIC insurance and easy access. Run both APYs through this savings calculator to see the dollar difference over your horizon.
Disclaimer: these calculators are educational tools, not financial advice. They model your inputs with published formulas, but they cannot know your full situation — for decisions with real stakes, talk to a qualified professional. Formulas and defaults last reviewed .