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Savings Calculator

See what regular deposits plus a starting balance grow to, with the contribution vs. interest split shown separately.

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How to use

  1. 1.Enter your starting balance and the amount you deposit each period.
  2. 2.Pick how often you deposit — monthly, quarterly, or annually — and enter the annual interest rate and number of years.
  3. 3.Read the future value along with total contributions and interest earned, updated in real time as you adjust any input.

About Savings Calculator

The savings calculator answers one everyday question: if I keep putting money aside on a schedule, how much will I actually have later — and how much of that is my own money versus interest the bank pays me? Enter a starting balance, a regular deposit amount, how often you deposit (monthly, quarterly, or annually), an annual interest rate, and the number of years. The result updates instantly with three figures: the projected future value, the total you contributed, and the interest earned on top.

This tool is built around recurring deposits, which is what sets it apart from a plain compound-interest calculator. A compound-interest calculator grows a single lump sum and shows how one deposit snowballs over time. This calculator instead models a stream of contributions — every month (or quarter, or year) you add more, and each new deposit starts earning interest from the moment it lands. That recurring pattern is exactly how real savings accounts, emergency funds, and automatic transfers behave, so the future-value number here reflects disciplined, ongoing saving rather than a one-off deposit.

Under the hood the calculator uses two standard formulas. Your starting balance grows by compound interest: initial x (1 + i)^N, where i is the periodic rate and N is the total number of periods. Your recurring deposits grow as an ordinary annuity — each deposit is assumed to arrive at the end of its period — using contribution x ((1 + i)^N - 1) / i. Adding the two pieces gives the future value. Total contributions are simply your starting balance plus every deposit you make, and interest earned is the future value minus those contributions, so you can see clearly how much of your balance is growth versus money you set aside.

Everything runs in your browser. No numbers are uploaded, no account is required, and there is no waiting on a server — type a value and the projection recalculates in real time. Use it to compare saving $100 a month versus $200, to test how a higher rate or an extra few years changes the outcome, or to sanity-check the promise of an automatic-savings plan. Because the deposit frequency, rate, and horizon are all adjustable, it works equally well for a short-term goal like a vacation fund and a long-horizon goal like a down payment. Estimates are for general information only and are not financial advice; actual returns depend on real account terms, fees, taxes, and rate changes, so verify any figure with a licensed professional before acting on it.

Methodology & sources

Future value combines two standard formulas. The starting balance grows by compound interest, initial x (1 + i)^N, and the recurring deposits grow as a future value of an ordinary annuity, contribution x ((1 + i)^N - 1) / i, where i = annualRatePct / 100 / compoundsPerYear and N = compoundsPerYear x years. When the rate is 0, future value reduces to initial + contribution x N. Total contributions equal the starting balance plus every deposit, and interest earned is future value minus total contributions. Deposits are assumed to arrive at the end of each period (ordinary annuity); real accounts may differ due to fees, taxes, variable rates, and timing. Estimates are for general information only and are not financial advice — verify figures with a licensed professional.

Frequently asked questions

How is this different from a compound interest calculator?
A compound-interest calculator grows a single lump sum. This savings calculator models regular, recurring deposits building up over time and splits the result into the money you contributed versus the interest earned, which matches how real savings plans and automatic transfers work.
When are my deposits assumed to be added?
Deposits are treated as an ordinary annuity, meaning each contribution is added at the end of every compounding period. This is the standard, slightly conservative assumption; depositing at the start of each period would earn a little more interest.
Does a higher deposit frequency change the result?
Yes. With the same annual rate, compounding and depositing more often (monthly rather than annually) produces a slightly higher future value because interest is calculated and added more frequently. Try switching the frequency to see the difference.

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