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My Capital

How much should I save per month?

Regularity and the DCA principle, from La Boite Elisma (currently only available in French)

Two ways to look at it: discover what a regular payment can grow into, or work out how much to set aside each month to reach a specific goal. Nothing is sent or kept after you close this page.

You choose this rate. We don't suggest one.

2% by default, the European Central Bank's reference. Editable.

Estimated final capital

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In today's purchasing power

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Total actually paid in0 €
Gains from interest0 €

This monthly amount isn't a fixed obligation. Regularity matters more than perfection: a tighter month, a more generous one, what matters is keeping the rhythm. What this amount builds isn't just capital. It's a habit. And a habit is worth sharing.

This is a simulation, not personalised advice. The return rate used is the one you chose, not a forecast or a recommendation from ElIsma Technologies. Past performance does not guarantee future results. To build a strategy suited to your situation, consult a licensed investment adviser. See the full disclaimer (FR).

Few people take the time to know exactly what their money can become. You just did.

Required monthly payment

0 €

Total that will be paid in0 €
Gains from interest0 €

This monthly amount isn't a fixed obligation. Regularity matters more than perfection: a tighter month, a more generous one, what matters is keeping the rhythm. What this amount builds isn't just capital. It's a habit. And a habit is worth sharing.

This is a simulation, not personalised advice. The return rate used is the one you chose, not a forecast or a recommendation from ElIsma Technologies. Past performance does not guarantee future results. To build a strategy suited to your situation, consult a licensed investment adviser. See the full disclaimer (FR).

Few people take the time to know exactly what their money can become. You just did.

This simulator builds on the 50/30/20 budget calculator. The amount you invest each month finds its natural place there. To explore freely over 10 to 30 years, The Snowball shows the power of time, with no specific goal to aim for. For a precise, distant ambition, The First Million calculates what it takes, nominal and real.

Why regularity matters more than the amount

This simulator compounds every month, not every year. That's not a technical detail: it's the same principle as DCA (dollar-cost averaging) and the regularity discussed in La Boite Elisma. A small amount paid in every month, without interruption, builds more than a large amount paid once and then forgotten.

The return rate is yours to choose. We don't suggest any rate. As a historical example, the MSCI World index has shown an average annual return of roughly 7 to 8% over the long term, while a regulated savings account or a euro fund shows more modest but more stable returns. Past performance never guarantees future results.

Inflation, meanwhile, doesn't show up on a bank statement. A capital that looks comfortable in 5 or 10 years will, in reality, have less purchasing power than the number displayed suggests. That's why this simulator always shows both results, nominal and real: so the decision is made with eyes open.

This calculator offers a simulation, not personalised advice. The results shown are indicative and don't replace the advice of a professional for a decision suited to your situation.

Frequently asked questions

How is the return rate calculated in this simulator? ▾
You choose the annual return rate to simulate yourself. The tool does not suggest or recommend any rate, it only applies the one you enter.
Why two results, nominal and real? ▾
The nominal amount is what you'll have in the account. The real amount, adjusted for inflation, represents what that capital will actually be able to buy, in today's purchasing power.
Why is compounding monthly? ▾
It matches a regular payment rhythm, consistent with a scheduled savings approach rather than a single lump payment, and with the regularity principle explained in the book.
Is my data saved anywhere? ▾
No. No data entered on this page is sent to a server or kept after you close the page.