Mortgage Borrowing Power Calculator

Mortgage Borrowing Power Calculator

Enter Your Details
Your Estimated Results
Fill in your details and click Calculate to see your estimated borrowing power and monthly repayments.
This is an estimate only. Actual borrowing capacity may vary.
Rate Cut Savings
Home loan calculator

How much would a lower rate save you?

Enter your loan details and choose a rate reduction to see the interest you'd no longer pay, each year and over the life of the loan.

$
Pre-filled with the Penrith median dwelling value.
% p.a.
Pre-filled with the median big-four bank variable rate.
25 years
5 years30 years
Repayment frequency
Fortnightly means half the monthly repayment every two weeks — 13 months' worth a year.
0.50%
0.10%1.00%

Interest paid each year

The shaded gap is what you save.

At 6.39% At 5.89% Interest saved

General information only. This calculator gives an estimate, not financial advice. It does not take your circumstances, fees or your lender's actual terms into account. Talk to your lender or a licensed adviser before acting on it.

How the figures are worked out. Assumes principal-and-interest repayments set over the remaining term and recalculated at the new rate; interest is calculated daily (rate ÷ 365) and charged monthly, as the major banks do. Fortnightly repayments are half the monthly repayment, rounded up to the cent (the method Westpac publishes), which pays the loan off early. Starts from today's date.

Default values, last checked 3 November 2026. Balance is the Penrith median dwelling value of $1,021,576 at 30 September 2026, from Cotality's Home Value Index (Cotality was formerly CoreLogic). Rate is the median of the four major banks' lowest variable owner-occupier interest rates — Westpac 6.34%, CBA 6.34%, NAB 6.44%, ANZ 6.50% (Mozo, 2 October 2026). Both change often — check them before relying on the result.

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Extra mortgage repayments

ING extra-loan-repayments