Compound Interest Calculator
See how savings grow with interest and regular deposits.
Input
This tool runs entirely in your browser. The data you paste or load is never uploaded.
Result
Enter your input, then run the tool.
About this tool
Projects the future value of an initial deposit plus optional monthly contributions at a given annual rate and compounding frequency, separating what you paid in from the interest earned, with a yearly growth table.
How to use it
- Enter the starting amount, the monthly contribution and the annual rate.
- Choose the duration and how often interest compounds.
- Press Calculate and read the final balance and yearly table.
Frequently asked questions
What is the rule of 72?
Divide 72 by the annual rate to estimate how many years it takes to double your money: about 10 years at 7%.
Are taxes and inflation included?
No. The projection is gross and nominal. Deduct tax on interest and compare with inflation to see real growth.
Keep going
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