Free mortgage calculator with real-time results, full amortization schedule, and expert mode. Compare French vs German amortization systems.
๐ Real-Time Calculation
Results update instantly as you type โ no "Calculate" button needed.
๐ Expert Mode
Compare French (constant payment) vs German (constant principal) amortization systems side by side.
๐ Amortization Table
Full month-by-month breakdown showing principal, interest, and remaining balance.
๐ก Use Cases
Essential for homebuyers comparing mortgage offers. Use the A/B comparator to evaluate two different mortgage rates side by side. The overpayment simulator shows exactly how much you save with extra monthly payments. Export the amortization schedule to CSV for your financial records.
โ๏ธ How It Works
The calculator uses standard financial formulas for French (annuity) and German (linear) amortization. All calculations run instantly in your browser with JavaScript โ no server needed.
โ FAQ
What is the difference between French and German amortization?
French amortization has constant monthly payments (most common worldwide). German amortization has constant principal payments, meaning monthly payments decrease over time.
Can I compare two mortgages?
Yes! The A/B comparator lets you enter two different mortgage scenarios and see them side by side.
Is my financial data private?
Completely. All calculations happen locally in your browser. We cannot see your financial information.
Can I export the amortization schedule?
Yes, you can export the full schedule to CSV for use in Excel or Google Sheets.
๐ How to Calculate Your Mortgage โ Step by Step
- Enter the loan amount โ How much are you borrowing?
- Set the interest rate โ Your annual interest rate (e.g., 3.5%).
- Choose the term โ Loan duration in years (e.g., 25 or 30 years).
- See results instantly โ Monthly payment, total cost, and interest update in real-time.
- Explore Expert Mode โ Compare French vs German amortization, simulate overpayments, use the A/B comparator.
๐ Understanding Amortization Systems
| System | Monthly Payment | Total Interest | Best For |
|---|---|---|---|
| French (Annuity) | Constant | Higher | Predictable budgeting |
| German (Linear) | Decreasing | Lower | Saving on total interest |
๐ก Mortgage Tips
- Small rate differences matter enormously โ A 0.5% lower rate on a 30-year mortgage can save thousands
- Overpayments are powerful โ Even โฌ50/month extra can reduce your mortgage by years. Use our simulator to see the exact impact.
- Compare banks โ Use the A/B comparator to put two offers side by side
- Consider the total cost โ Look beyond the monthly payment at the total amount you will pay over the life of the loan