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Compound Interest Calculator

Project savings growth with contributions and compounding.

Future value
$144,572.72
Total contributions
$58,000.00
Total interest earned
$86,572.72
Year-by-year growth
YearContributionsInterestBalance
1$12,400$801$13,201
2$14,800$1,834$16,634
3$17,200$3,115$20,315
4$19,600$4,662$24,262
5$22,000$6,495$28,495
6$24,400$8,633$33,033
7$26,800$11,100$37,900
8$29,200$13,918$43,118
9$31,600$17,114$48,714
10$34,000$20,714$54,714
11$36,400$24,747$61,147
12$38,800$29,246$68,046
13$41,200$34,244$75,444
14$43,600$39,776$83,376
15$46,000$45,882$91,882
16$48,400$52,603$101,003
17$50,800$59,983$110,783
18$53,200$68,070$121,270
19$55,600$76,915$132,515
20$58,000$86,573$144,573

All calculations run privately in your browser. Nothing you enter is uploaded or stored.

About the Compound Interest Calculator

This compound interest calculator projects how savings or investments grow over time from a starting principal, regular monthly contributions, an annual interest rate, and your chosen compounding frequency. It shows the future value, how much of that is your own contributions versus earned interest, and a year-by-year table of the growth. Seeing contributions and interest side by side makes the power of compounding obvious. Everything is computed locally in your browser.

Compound Interest Calculator features

  • 01

    Contributions and compounding

    Model a lump sum plus recurring monthly deposits, and choose annual, semi-annual, quarterly, monthly, or daily compounding.

  • 02

    Contributions vs. interest

    The results separate the money you put in from the interest it earned, so you can see exactly how much compounding added.

  • 03

    Year-by-year growth table

    A yearly schedule shows the balance, total contributions, and total interest at the end of each year of your projection.

Compound Interest Calculator FAQ

What is compound interest?
Compound interest is interest earned on both your original principal and the interest already added. Over time this snowball effect makes balances grow faster than simple interest.
How does compounding frequency affect growth?
The more often interest compounds — daily rather than annually, for example — the slightly higher the final balance, because interest starts earning interest sooner. This calculator lets you compare frequencies instantly.
How do monthly contributions change the result?
Regular deposits are added to the balance each month and then compound along with everything else, so consistent contributions often make a bigger difference than a higher rate over the long run.
What is future value?
Future value is what your investment will be worth at the end of the period, including principal, all contributions, and all compounded interest. It's the headline number this calculator returns.
Are these projections guaranteed?
No. They assume a fixed rate and steady contributions; real investment returns vary year to year. Use it as a planning estimate. All calculations run privately in your browser.

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