Initial and monthly deposits
Start with how much, save how much a month, for how many years, at what rate. The four questions that matter, and no more.
Interest on interest, month by month, with the maths shown.
What your money turns into if you put some away every month and leave it alone. Interest on interest, month by month, with the maths shown — not just the final number every other site prints without explaining where it came from.
What it will do
Month by month, line by line
The whole table: how much you deposited and how much the interest earned. This is where the number stops being magic.
The chart that convinces
The curve where interest overtakes your own deposits. Seeing the exact year that happens is what makes someone start saving.
Inflation discounted
A million in twenty years does not buy what a million buys today. We show both numbers, side by side, unvarnished.
A real comparison
The same simulation across savings accounts, the CDI rate and whatever rate you like — on one screen, so the gap speaks for itself.
The maths in reverse
"I want a million in 20 years — how much a month?" The question people actually ask.
Being honest: this is a calculator, not investment advice. It projects a rate you chose yourself — and no real investment returns exactly the same thing every month.
Not live yet
This is the shop window. Once the calculation engine is ready, this page becomes the real app.