Budget calculator

See what the breakdown of your expenses visually represents and discover your monthly savings rate. All you have to do is enter your income and expenses.

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This tool is for informational purposes only. It should not be considered financial advice.

How does the budget calculator work?

The calculator takes your income, investments and expenses and turns them into a clear flow diagram. To make things easier, examples are pre-filled in the form, but you are entirely free: name the fields, add categories and lines, and structure the diagram as you wish. You will know exactly how much you earn, spend, save and invest each month.

How to read the Sankey diagram?

A Sankey diagram is a graphical representation of flows: the width of each line corresponds to the amount of the flow. The heavier a category weighs in your budget, the wider its line. The left side represents your inputs (all your sources of income), which converge into a central Budget node, then split on the right into outputs (your investments and your expenses).

Filling in your income, investments and expenses

First, enter your sources of income (salary, spouse's salary, rental income, investment income, self-employment). Then enter your investments, organised by account type (brokerage, retirement, life insurance, savings) and then by instrument (stocks, ETFs, bonds, crypto). Finally, list your expenses by category (housing, daily life, subscriptions, travel, leisure) and then line by line. Ideally, your income should be neither higher nor lower than the sum of expenses + investments, otherwise you are dipping into your reserves or leaving money idle.

Savings rate and possible savings rate

The savings rate is the share of your income you devote to saving: here, we assume that what you already invest is your savings rate. The possible savings rate is your income minus your expenses, divided by your income: it is the share you could still invest, beyond what you already set aside. The gap between the two shows your room to manoeuvre.

What to do once you've calculated your budget?

Your monthly budget is an excellent starting point to know how much you can invest each year. Once you know that amount, project the growth of your wealth over time with our wealth simulator or estimate the return on your savings with the compound interest calculator.

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