Compound Interest Calculator

See how much your money can grow with compound interest and regular contributions over time.

Initial Investment

Annual Interest Rate (%)

Time Period (Years)

Regular Contribution ($)

Contribution Frequency

Compounding Frequency

Final Balance

$310,832

Total Contributed

$130,000

Total Interest Earned

$180,832

Growth Breakdown

Contributed: 41.8%Interest: 58.2%

Year	Start Balance	Contributions	Interest	End Balance
1	$10,000	$6,000	$1,157	$17,157
2	$17,157	$6,000	$1,674	$24,831
3	$24,831	$6,000	$2,229	$33,059
4	$33,059	$6,000	$2,824	$41,883
5	$41,883	$6,000	$3,461	$51,344
6	$51,344	$6,000	$4,145	$61,490
7	$61,490	$6,000	$4,879	$72,369
8	$72,369	$6,000	$5,665	$84,034
9	$84,034	$6,000	$6,509	$96,543
10	$96,543	$6,000	$7,413	$109,955
11	$109,955	$6,000	$8,382	$124,338
12	$124,338	$6,000	$9,422	$139,760
13	$139,760	$6,000	$10,537	$156,297
14	$156,297	$6,000	$11,732	$174,029
15	$174,029	$6,000	$13,014	$193,044
16	$193,044	$6,000	$14,389	$213,433
17	$213,433	$6,000	$15,863	$235,295
18	$235,295	$6,000	$17,443	$258,739
19	$258,739	$6,000	$19,138	$283,877
20	$283,877	$6,000	$20,955	$310,832

What is Compound Interest?

Compound interest is interest calculated on the initial principal, which also includes all of the accumulated interest from previous periods. This means your money grows faster over time because you earn interest on your interest — not just on your original deposit.

Compound vs Simple Interest

Simple interest is calculated only on the principal amount. Compound interest is calculated on the principal plus any interest that has already been earned. Over long periods, this difference becomes dramatic. For example, $10,000 at 7% for 20 years:

Simple Interest: $24,000 total
Compound Interest (monthly): ~$40,000+ total

Regular contributions make an even bigger difference. Even small monthly additions can grow into substantial wealth over decades thanks to compounding.

⚠️ Disclaimer

This calculator provides estimates based on standard mathematical formulas only. It does not account for taxes, insurance, fees, or country-specific regulations. Results are for informational purposes and should not be considered financial, medical, or legal advice. Always consult a qualified professional before making important decisions.