Compound Interest Calculator
Estimate how your savings grow over time with monthly contributions and compounding interest.
How to use it
Enter your starting amount, how much you add each month, the yearly interest rate, and how long you plan to save. Pick how often interest is compounded. The results update as you type.
How the calculation works
Each contribution grows by the interest rate, and interest is added to the balance at the chosen frequency. The final amount equals the initial sum plus all monthly deposits, each increased by the compound growth factor for the time it stays invested.
FAQ
Is my data saved? No. Everything runs in your browser, and nothing is stored or sent anywhere.
Can I use a different currency? Yes. The numbers are just values, so you can enter any currency you like.
What if I leave a field blank? The tool treats blank or invalid entries as zero and shows a dash instead of an error.
Does this account for taxes or fees? No. It only applies the interest rate you enter, so adjust the rate if you want to reflect fees.
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