What does compounding frequency mean?

It is how often earned interest is added back to the balance. More frequent compounding produces slightly more growth for the same rate.

How much should I invest each month?

A common rule of thumb is 15% of gross income for retirement. Enter a few values to see how much difference a higher monthly amount makes.

Compound Interest Calculator

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Starting amount ($)

Monthly contribution ($)

Annual return (%)

Years (yr)

Compounding

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See what your savings grow into over time with monthly contributions and any compounding frequency. Free, no signup.

How to use Compound Interest Calculator

Open the toolNo signup and nothing to install; it works as soon as the page loads.
Set “Starting amount”
Set “Monthly contribution”
Set “Annual return”
Set “Years”
Set “Compounding”
Read the resultChange any input and the result is recalculated immediately.

Worked example with the defaults

FUTURE VALUE · $170,851 in growth: $300,851

Nothing you enter leaves your device

All of the work happens inside your browser. Whatever you type is never packaged up and sent to a server, and no request this page makes carries it.

That makes it safe for contract amounts, personal details and internal documents you would rather not hand to a third party — close the tab and it is gone.

What this tool does not do

Compound Interest Calculator only does what a browser can do on its own — it talks to no backend service. So it keeps no history for you and syncs nothing across devices; if you need a record, copy or download the result.

It is also not a substitute for professional judgement. For legal, medical or tax decisions, treat the output as a starting point rather than a final answer.

Frequently Asked Questions

What does compounding frequency mean?: It is how often earned interest is added back to the balance. More frequent compounding produces slightly more growth for the same rate.
How much should I invest each month?: A common rule of thumb is 15% of gross income for retirement. Enter a few values to see how much difference a higher monthly amount makes.