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Compound Interest Calculator

Enter principal, interest rate, time period, and compounding frequency. See a visual growth chart, monthly breakdown table, and comparison between simple and compound interest.

Final Balance
$54,714
Total Interest
$20,714
Total Deposits
$34,000
Growth Chart
Y1
$13,201
Y2
$16,634
Y3
$20,315
Y4
$24,262
Y5
$28,495
Y6
$33,033
Y7
$37,900
Y8
$43,118
Y9
$48,714
Y10
$54,714
— Deposits— Compound
Yearly Breakdown
YearBalanceInterestDepositsSimple
1$13,201$801$12,400$13,100
2$16,634$1,834$14,800$16,200
3$20,315$3,115$17,200$19,300
4$24,262$4,662$19,600$22,400
5$28,495$6,495$22,000$25,500
6$33,033$8,633$24,400$28,600
7$37,900$11,100$26,800$31,700
8$43,118$13,918$29,200$34,800
9$48,714$17,114$31,600$37,900
10$54,714$20,714$34,000$41,000

Compare compound vs simple interest. All calculations are local.

How to Calculate Compound Interest

Project investment growth with charts and yearly breakdowns using The IT Hustle's free Compound Interest Calculator.

  1. 1
    Enter your starting amountSet the principal — the amount you're investing or saving today.
  2. 2
    Set the rate and timelineEnter the expected annual interest rate and how many years (up to 50) the money will grow.
  3. 3
    Choose compounding frequencyPick annually, semi-annually, quarterly, monthly, or daily — how often earned interest starts earning its own interest.
  4. 4
    Add regular contributionsEnter an optional recurring contribution per period to model consistent saving on top of the initial amount.
  5. 5
    Study the resultsRead the final balance, total interest earned, and total deposits, then explore the year-by-year chart and table — including a column showing what simple interest would have earned instead.

Frequently Asked Questions

Interest that earns interest. Each period's earnings are added to your balance, so the next period's interest is calculated on a larger amount — which is why growth curves bend upward over time instead of rising in a straight line.

More frequent compounding grows faster, but the effect is smaller than people expect — at 5%, daily compounding beats annual by only about 0.13 percentage points of effective yield. Rate, time, and contributions matter far more than frequency.

Simple interest is always calculated on the original principal only; compound interest is calculated on principal plus accumulated earnings. The calculator's table shows both side by side — the gap becomes dramatic over long periods.

Extremely — often more than the starting amount. Modest monthly contributions compound from every deposit date, and over decades typically account for the majority of the final balance. Adjust the contribution field and watch the chart to see it.

A quick mental estimate: divide 72 by your annual rate to get the years needed to double your money. At 8%, that's roughly 9 years. Verify it against the calculator's exact year-by-year table.

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