Skip to content

Compound Interest Calculator

Calculate compound interest with monthly contributions. See growth projections, total interest earned, and year-by-year breakdown. No signup required.

FreeNo SignupNo Server UploadsZero Tracking

Investment Parameters

Results

Final Amount

$54,713.58

Principal

$10,000.00

Total Interest

$20,713.58

Total Contributions

$24,000.00

Growth Over Time

Yr 1
$13,201.42
Yr 2
$16,634.27
Yr 3
$20,315.28
Yr 4
$24,262.39
Yr 5
$28,494.83
Yr 6
$33,033.24
Yr 7
$37,899.74
Yr 8
$43,118.03
Yr 9
$48,713.55
Yr 10
$54,713.58
Contributions Interest
YearContributionsInterest EarnedBalance
1$2,400.00$801.42$13,201.42
2$2,400.00$1,032.85$16,634.27
3$2,400.00$1,281.01$20,315.28
4$2,400.00$1,547.11$24,262.39
5$2,400.00$1,832.45$28,494.83
6$2,400.00$2,138.41$33,033.24
7$2,400.00$2,466.49$37,899.74
8$2,400.00$2,818.29$43,118.03
9$2,400.00$3,195.52$48,713.55
10$2,400.00$3,600.02$54,713.58
Export
Embed code
<iframe src="https://calcforest.com/embed/compound-interest" width="100%" height="600" frameborder="0" title="Compound Interest Calculator - CalcForest"></iframe>
<p style="font-size:12px;text-align:center;margin-top:4px;">
  <a href="https://calcforest.com/tools/compound-interest" target="_blank" rel="noopener">Powered by CalcForest</a>
</p>
Attribution preview

Powered by CalcForest

How to Use Compound Interest Calculator

  1. 1

    Enter principal

    Enter your initial investment amount.

  2. 2

    Set rate and time

    Enter the annual interest rate and number of years.

  3. 3

    Choose frequency

    Select how often interest compounds: daily, monthly, quarterly, or yearly.

  4. 4

    Add contributions

    Enter any recurring monthly contribution amount.

  5. 5

    View results

    See your final amount, total interest, and year-by-year growth chart.

Frequently Asked Questions

Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. This creates exponential growth over time, often called 'interest on interest'.

More frequent compounding (e.g., daily vs. yearly) produces slightly higher returns because interest is calculated and added to the balance more often. However, the difference becomes smaller as frequency increases.

The Rule of 72 is a quick way to estimate how long it takes to double your money. Divide 72 by the annual interest rate to get the approximate number of years. For example, at 8% it takes roughly 72/8 = 9 years.

This calculator uses standard compound interest formulas and performs all calculations client-side in your browser. Results are mathematically accurate for the given inputs.