Byrz tools
The repayment is one number. The interest bill is the other.
See the monthly repayment for any loan, then what an offset account and extra repayments actually do: they do not change what you must pay each month, they change how many years you pay it for.
The loan, and what your two levers do to it
The offset balance is treated as staying constant, and interest is worked monthly on the offset-reduced balance. Estimates only, not an offer of credit and not a quote: your lender's exact figures will differ slightly.
See what you could borrow to find your loan size, check where your savings land, or head back to all the tools.