Tool
Compound interest calculator
Plug in your own numbers to see how a starting amount plus monthly contributions can grow over time. The whole calculation runs in your browser — nothing is saved or sent anywhere.
Estimated future value
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Educational estimate using a constant rate — real returns vary and can be negative in some years. Does not account for taxes or fees. Not financial advice.
Frequently asked questions
What annual rate should I use?
It depends entirely on the instrument: a savings account might return close to inflation, a diversified equity fund has historically returned more but with real volatility. Try several rates to see the range of possible outcomes, rather than trusting a single number.
Does this calculator account for inflation?
Not automatically. If you want to see growth in real terms (purchasing power), subtract your expected annual inflation from the rate you enter.
Is my data saved anywhere?
No. The whole calculation happens in your browser with simple JavaScript — nothing is sent to any server.