Mortgage Payment Calculator
Calculate monthly principal and interest for a fully amortising loan.
Calculated directly from the assumptions shown.
Continue in the full model.
Move from this screening result to the complete Acquisition Financing Model.
Get the model · €49 incl. VATHow the Mortgage Payment calculation works
Payment = principal × monthly rate ÷ [1 − (1 + monthly rate)^−months].
Example calculation
A €1.0m loan at 5.5% over 25 years has a level monthly payment of approximately €6,141 and annual debt service of €73,690.
How professionals use the result
Use this for level-payment loans. Balloon structures require a separate term and maturity-balance calculation.
Common mistakes
- Using annual rate as a monthly rate
- Confusing amortisation with loan term
- Ignoring fees
- Assuming the rate stays fixed when it is floating
Mortgage Payment Calculator FAQs
What does the Mortgage Payment calculator measure?
Calculate monthly principal and interest for a fully amortising loan.
What formula does the Mortgage Payment calculator use?
Payment = principal × monthly rate ÷ [1 − (1 + monthly rate)^−months].
Is the result suitable for a final investment decision?
Use it as a transparent screening calculation. Validate deal-specific tax, timing, financing and legal assumptions in a complete underwriting model before making a decision.
Do I need an account?
No. The calculator is free and runs in your browser. FormulaPlanet does not store your projects, inputs or results.
Is any input sent publicly?
No calculation is public by default. A shareable link is only created when you explicitly choose to copy one; that link contains the assumptions shown in its URL.
Why might my spreadsheet give a different answer?
Differences usually come from timing, compounding, sign conventions, fees or a different definition of the numerator or denominator. Match every period and definition before comparing.
What should I review alongside this result?
Use this for level-payment loans. Balloon structures require a separate term and maturity-balance calculation.
Which mistakes are most common?
Using annual rate as a monthly rate; Confusing amortisation with loan term; Ignoring fees; Assuming the rate stays fixed when it is floating.