Compound Interest Calculator

See your savings grow

Starting amount

Monthly contribution

Annual interest rate (%)

Years

Compounding

Future value

Compound Interest Calculator — guide & how to use

What it does

This compound interest calculator projects the future value of a starting balance plus optional monthly contributions, using your interest rate, time horizon, and compounding frequency. It breaks out how much you put in versus how much is interest earned. Calculated privately in your browser, free.

How to use it

Enter your starting amount and any monthly contribution.
Set the annual interest rate, number of years, and how often it compounds.
Read your projected future value and the interest earned.

How to embed this tool on your website

No account, no coding. Copy the embed code and paste it where you want it to appear:

<iframe src="https://snaptoolsuite.com/compound-interest-calculator/?embed=1"
  style="width:100%;max-width:560px;height:860px;border:0;"
  title="Compound Interest Calculator" loading="lazy"></iframe>
<p>Free <a href="https://snaptoolsuite.com/compound-interest-calculator/">Compound Interest Calculator</a> by Snap Tool Suite</p>

2 Paste it on your page

3 It just works

See it live: view a real embed example →

Frequently asked questions

How does compound interest work?

You earn interest on your principal and then on the interest already added. The more often it compounds (daily vs annually) and the longer the term, the larger the effect.

How are monthly contributions handled?

Contributions are added monthly and compounded monthly. The result shows your total contributions separately from the interest earned, so you can see what your own deposits add up to.

Is this financial advice?

No — it's an estimate for planning only and assumes a constant rate. Real returns vary. Always confirm with your bank or a licensed advisor.

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