Compound Interest Calculator
Project investment growth with compound interest and regular contributions.
$
$
%
Future balance
$63,367.82
Starting principal$10,000.00
Contributions$30,000.00
Interest earned$23,367.82
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How the calculation works
This calculator applies the standard formula below to the values you enter. Results update instantly in your browser—nothing is submitted to a server.
Formula
A = P(1 + r/n)ⁿᵗ, plus the future value of regular contributions.
Worked example
$10,000 plus $250 monthly at 7% grows to roughly $62,000 in ten years.
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Frequently asked questions
Is this compound interest calculator free?
Yes. It works instantly in your browser with no signup.
Are the results exact?
Results follow the stated formula, but real-world fees, timing, and rounding can vary.
Results are estimates for informational purposes and are not financial or professional advice.