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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All tools
Margin Calculator
Calculate your gross margin, markup rate and check product profitability in seconds.
Micro-enterprise net income calculator
Estimate how much remains after French micro-enterprise contributions, optional tax payment, business expenses and a safety margin.
Budget & savings calculator
Enter your salary and expenses to see if your lifestyle is sustainable. Compare your split against the 50/30/20, 60/20/20, 70/20/10 and 80/20 methods to save smarter.
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.
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.
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.
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.
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.
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.
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.
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.
Job Offer Comparison Tool
Compare two jobs: salary, bonuses, expenses and commuting. See how much money is left and how much time each job takes, then download the result.