Free finance and budget calculators
Calculate a salary, margin, percentage or shared expense in seconds. The tools go straight to the result, with no account required.
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Tous les outils
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.
Bill splitter
Split a restaurant bill fairly when some had wine and others just a salad. Handles personal items, tip, and a copy-ready summary for WhatsApp.
Savings vs inflation: the real value of your money
Compare the balance shown by your bank with its real value after inflation. Capital, monthly contribution, account rate, taxation and duration: see what your savings will really be worth.
Margin Calculator
Calculate your gross margin, markup rate and check product profitability in seconds.
French real expenses tax calculator
Calculate your French real expenses for tax purposes: working days, commute mileage, deductible kilometers, tolls, parking and comparison with the automatic 10% deduction.