Hi Kate,
Unfortunately inputting a few figures into a simple mortgage calculator won't give you the answers you're looking for. There are so many variables like having a fixed rate or tracker, repayment or interest only, 25 year or 30 year term etc etc that will decide the monthly payment.
Start by working out your budget & seeing how much you are able to comfortably afford each month then book an appointment with a fees free independent mortgage broker who can discuss all your options.
Let us know how you get on.
Burger