Tools
Run the numbers yourself
Small, free calculators for the arithmetic that decides most of a financial life. No sign-up, no predictions: you set the assumptions, the tools do the arithmetic and show their work.
Debt
Credit card debt calculator
Enter a balance, the interest rate, and how you pay. See how long the debt takes to clear, the total interest in euros, and where each payment actually goes.
Compounding
Compound interest calculator
Run a monthly contribution forward at a growth rate you choose. See what compounding builds over decades, what you paid in against what growth added, and the same picture in today's money.