Investing
Compound Interest Calculator
Project how a starting balance and steady monthly contributions could grow over time.
Free · No sign-up · Your inputs stay in your browser
Your numbers
Project investment growth
Your projection
$300,851 projected balance
Money contributed
$130,000
Estimated growth
$170,851
About this tool
Method, assumptions, practical next steps, and limits.
See what time contributes
Compounding earns returns on both your contributions and earlier growth. Small changes in time can therefore matter more than small changes in the monthly deposit.
Calculation method
The calculator compounds monthly and assumes each contribution arrives at the end of the month. The return is constant and is not a forecast.
Use a range
Run conservative, middle, and optimistic rates. Real investments move unevenly and can lose value, especially over shorter periods.
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Frequently asked questions
Does this tool save my numbers?
No. The calculation runs in your browser and the inputs are not sent to our server.
Is the result a guarantee?
No. It is an educational projection based on the assumptions you enter, not financial, tax, lending, or insurance advice.
What should I check next?
Compare the projection with a lower return, then check account fees, taxes, and whether the monthly contribution fits your spending plan.
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