Updated for 2026

Savings Calculator

A savings calculator shows what your money becomes: it applies compound interest to a starting balance, adds every deposit you make, and rolls the interest back in. Enter your amount, your rate and your time frame below — the balance, the interest earned and the year-by-year build-up update as you type.

Your plan

Updates as you type

Starting amount what you have today

$0$100k

Regular deposit per period below

$0$3,000

Annual rate (APY) use your bank's figure

0%12%

Pre-filled with an illustrative 4.00% — replace it with the APY your account actually pays.

Time frame years

1 yr40 yrs

Compounding

Deposit frequency

Deposits land at the start or end of each period

Copied

Balance after years

of your own money, plus of interest.

Money you deposit Interest earned

Starting amount
Deposits over the term
Interest earned
Final balance

Figures assume the rate you entered holds for the whole term and that no money is withdrawn. Real APYs move, and interest on a taxable account is generally taxable income. This is a calculation, not financial advice.

Effective annual rate

Interest, year 1

Interest, final year

Interest share of balance

Year-by-year build-up

How the balance grows each year on the figures you entered.
Year	Opening	Deposits	Interest	Closing

Swipe the table sideways to see every column.

The math behind it

How compound interest is calculated

Two formulas do all the work here, and you can check both by hand.

A lump sum grows by FV = P (1 + r/n)^nt — where P is your starting amount, r the annual rate as a decimal, n how many times a year interest is added, and t the number of years. Put $10,000 in at 5% compounded once a year for 10 years and you get $16,288.95.

Regular deposits grow by FV = PMT × ((1 + i)^N − 1) / i, where i is the rate for one deposit period and N the number of deposits. Paying in $500 a month at 6% compounded monthly for 10 years gives $81,939.67 — $60,000 of it your own money, the rest interest.

This calculator runs both, period by period, so the yearly table above adds up to exactly the final balance. When your deposit schedule and the compounding schedule differ — weekly deposits into a monthly-compounding account, say — it converts the rate to the deposit period with i = (1 + r/n)^n/c − 1 rather than approximating.

One thing worth knowing: APY already includes the effect of compounding, APR does not. If a bank quotes you a nominal rate plus a compounding frequency, enter it as APR on the APY-vs-APR page and this calculator will use the effective figure.

The full set

Every savings calculator on this site

Twenty focused tools, each one doing a single job properly.

Built and maintained by Mustafa Bilgic · Independent calculator site — no bank affiliation, no rate quotes · Updated 8 August 2026

Sources

Annual percentage yield formula — Truth in Savings Act, Regulation DD, 12 CFR Part 1030, Appendix A (Consumer Financial Protection Bureau).
Deposit insurance limits and national deposit rate publication — Federal Deposit Insurance Corporation (fdic.gov).
Compound interest and annuity formulas — standard financial mathematics; every figure on this page is computed from the inputs you enter, not quoted from a provider.