FinKoko
FinKoko

Compound Interest Calculator

See the Power of Compound Interest

Find out how your money grows when you let time and reinvested earnings do the work.

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Get Answers in Seconds

Enter your numbers, see the results. No finance degree required.

FinKoko

Pick Up Where You Left Off

All your calculations are saved automatically. Export any result as a clean PDF to share or keep.

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Frequently Asked Questions

Yes. Every calculation is free with no time limit and nothing locked behind a trial. A one-time in-app purchase removes the ads and unlocks the extra charts, if you want them.

Enter your starting amount, the interest rate you expect, how many years you plan to leave it, and anything you add along the way. FinKoko shows your balance over time, how much of it is interest, and how the two pull apart as the years go by.

Yes, and this is where compounding gets interesting. Add what you put in each period and you can see how a small, steady contribution ends up doing more work than the starting amount did.

Yes. Pick the compounding frequency that matches your account rather than assuming annually, and every figure recalculates around it.

Your calculations save automatically, so you can reopen one later instead of retyping it. Any result exports as a clean PDF if you want to send it to someone or keep a copy.

No. There is no account, no signup, and nothing to hand over. Your figures are worked out on your phone and stay there, and the app collects no data and shares none with anyone.