Calculate compound interest with monthly contributions. See how your savings grow over time with a visual chart.
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Final Balance
$107,144
Total Contributions
$70,000
Total Interest Earned
$37,144
Contributions (65%)Interest (35%)
Year
Balance
Contributions
Interest
1
$16,955
$16,000
$955
2
$24,413
$22,000
$2,413
3
$32,411
$28,000
$4,411
4
$40,986
$34,000
$6,986
5
$50,182
$40,000
$10,182
6
$60,042
$46,000
$14,042
7
$70,614
$52,000
$18,614
8
$81,952
$58,000
$23,952
9
$94,108
$64,000
$30,108
10
$107,144
$70,000
$37,144
How to Use
1
Enter principal amount
Input your initial investment or deposit amount.
2
Set rate and duration
Enter the interest rate, compounding frequency, and time period.
3
View growth projections
See your total balance and interest earned over time.
Tips
Frequently Asked Questions
What is compound interest?
Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. It makes your money grow faster than simple interest.
How does compounding frequency affect returns?
More frequent compounding (daily vs yearly) earns slightly more interest because interest is added to the balance more often, allowing subsequent interest calculations on a larger amount.
What is the Rule of 72?
The Rule of 72 estimates how long it takes to double your money: divide 72 by the annual interest rate. At 7%, your money doubles in about 10.3 years.
Is this compound interest calculator private? Does it store my financial data?
No. Math runs on your computer with JavaScript — your principal, rate, and results stay on your device, and nothing is saved or sent to any server.