Compound Interest Calculator

Estimate how an investment grows over time with compound interest and optional monthly contributions.

Starting amount ($) Monthly add ($)

Annual return (%) Years

How to use the Compound Interest Calculator

Enter your starting amount and monthly contribution.
Set the annual return and number of years.
Click Calculate to see your projected balance.

100% free, no sign-up, and it all runs in your browser — your data never leaves your device.

FAQ

How does compounding help?

You earn returns on your returns, so growth accelerates the longer you stay invested.

Add this tool to your website — free

Paste this where you want the tool to appear. It links back to ToolKraken.

Option 1 — iframe

<iframe src="https://www.toolkraken.com/embed/compound-interest-calculator" width="100%" height="520" style="border:1px solid #e5e7eb;border-radius:12px" loading="lazy" title="Compound Interest Calculator"></iframe>

Option 2 — script

<script src="https://www.toolkraken.com/embed.js" data-tool="compound-interest-calculator"></script>

Compound Interest Calculator

How to use the Compound Interest Calculator

FAQ

How does compounding help?

Add this tool to your website — free

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