Finance & budget: tools, guides and useful answers
Keep a clear view of your numbers without jargon. Tools, guides and questions help you calculate, compare and decide with more confidence.
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Tools & Calculators
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Mortgage simulator
Compute your monthly payment, the total cost of your mortgage, and see the principal / interest / insurance split. Yearly amortization schedule included, no sign-up.
Percentage calculator
Compute a discount, VAT, margin, share or evolution in real time. Fill in any two boxes, the third adjusts automatically. Bi-directional, with full formula and multiplier coefficient so you actually understand the math.
Rule of three (cross multiplication)
Good old cross multiplication, made fast. Enter 3 known values, the tool computes the 4th instantly. Handles units, decimal commas and large numbers. No sign-up.
Who owes what? - Shared expense calculator
Simplify group expenses: add each person’s costs and instantly see who owes what. The tool calculates the fair share and minimizes repayments. No sign-up required, auto-saved in your browser.
Net / Gross salary calculator
Convert gross salary to net (and vice versa) in real time. Includes total employer cost (super gross), a raise simulator and rates for France, Belgium, Switzerland and Canada.
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9 tools
Guides & Tutorials
Understand the basics before taking action.
How to calculate real expenses for French taxes: complete method
A simple method to calculate French real expenses: working days, commute mileage, the 40 km rule, meals, supporting documents and comparison with the automatic 10% deduction.
Calculate Your Net Salary: What You Actually Take Home
Got a job offer with an attractive gross salary? Learn how to calculate your real take-home pay, understand deductions, and know exactly what you’ll get each month.
Handling group expenses without conflict: the BBQ story
Discover how to manage group expenses without creating tension. Through the story of a BBQ with friends, learn how to calculate who owes what and make repayments simple.
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Practical questions
Find a short answer to common questions.