We never hand you a ready-made answer. We give you what you need to understand, so the decision stays yours. Each tool follows a step of the method explained in the book.
Budget · The picture first
Before you split it, you need to know where you stand. Two numbers, a pie chart, the exact reality of this month.
Use this tool →Budget
Split your income using the three-drawer method: essential expenses, safety cushion, and enjoyment. Drawers 1 and 2 of the method.
Use this tool →Savings & investing
Discover what a regular payment can grow into, or calculate how much to set aside to reach a goal. Uses the compound interest method. Drawer 3 of the method.
Use this tool →Long-term investing
The power of time on your capital, visualised over 10 to 30 years. To understand, not to aim for a precise goal.
Use this tool →Ambitious goal
How much to save per month to reach 1,000,000 €, in nominal value and in real purchasing power. Two answers, one ambition.
Use this tool →Real estate
Gross and net yield of a rental property, before you commit. Purchase price, rent, charges: all accounted for.
Use this tool →Business
At what revenue does your business start generating real income? Fixed costs, selling price, variable cost.
Use this tool →Business · France
The same take-home pay, two very different costs depending on your French legal status. Compare EURL, EI and SASU in seconds.
Use this tool →Business
From your cost to your selling price, without confusing markup and real margin rate.
Use this tool →These tools extend what's explained in La Boite Elisma (currently available in French only). More calculators will be added progressively.