What will your savings grow into?
Enter your monthly contribution, duration and return and instantly see your final amount and the interest earned through compounding. No sign-up, no cloud — everything runs on your device.
Compound interest & savings calculator
In Kontoo you link this with real savings, net worth and goals — including history and forecast, all private on your device.
FAQ
About compound interest & saving
What is compound interest?
The interest you earn is reinvested and earns interest itself – interest on interest. The longer the horizon, the stronger the effect: a large share of the final amount then comes from returns, not your own deposits.
What return is realistic?
Broadly diversified stock ETFs have historically returned about 5 to 7% per year over the long run – but with no guarantee and plenty of ups and downs. Plan conservatively.
Are taxes and inflation included?
No. The calculator shows the nominal final amount before tax and inflation. Both reduce the real return – keep a buffer.
Is my data stored?
No. The calculator runs entirely on your device – no account, no cloud, no tracking. There is no server that sees your inputs.
Your data stays with you. Period.
Kontoo collects, sees and stores none of your data. No account, no cloud, no trackers, no ads – this calculator runs entirely on your device too.