Mortgage & financing

Interest-only Mortgage Payment Calculator

Calculate an interest-only payment and compare it with amortizing debt. Replace every default with figures that apply to your property and location.

What this calculator estimates

Calculate an interest-only payment and compare it with amortizing debt. It combines the inputs below to produce Monthly interest-only payment. Every assumption remains editable so the estimate can reflect the property, financing and location being evaluated.

Worked example

Using the displayed sample assumptions, the calculator produces $2,500. This is an illustration, not a market quote. Change one input at a time to understand what drives the result.

Inputs and assumptions

• Loan amount — sample input: 500000 currency units
• Annual interest rate — sample input: 6 %
• Comparison amortization — sample input: 25 years

How to interpret the result

Compare the payment with your total housing budget, not income alone. Compare a conservative case with an expected case and keep a record of the assumptions used.

Common mistake to avoid

Avoid assuming the lowest advertised rate applies to every borrower. Local definitions, taxes, lending practices and measurement requirements can materially change the result.

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Reviewed 2026-09-08.