Mortgage calculators:
What are they and why do I need one?

Mortgage calculators let you work out how much you can borrow and how much you’ll pay back. Read on to learn how they work, what you need to use them, and how OneDome’s Mortgage Passport can help.

What is a mortgage calculator?

A mortgage calculator is a tool that helps people figure out how large a mortgage loan they can get, or more importantly, how much they actually need. Also, it calculates how much they will need to pay back in monthly repayments. The exact amount someone can get depends on the type of mortgage and the mortgage lender.

How to mortgage calculators work?

Mortgage calculators work by factoring in a number of important details, including available finances, whether or not you’re a first-time buyer, if you’re moving home, remortgaging, or trying to get a buy-to-let mortgage. They combine some of these factors to give you an accurate estimate of what you can get, which allows you to make informed decisions on what kind of property you can afford.

Another thing a mortgage calculator does is help you work out the amount of interest you’d need to pay back over the mortgage term (the duration of the mortgage repayment). For the most part, this interest rate is determined by the length of the mortgage, how many people are seeking mortgages at the time, and the health of the economy.

What do I need to complete a mortgage calculator?

You will need to have all of the relevant details to hand, including accurate financial numbers. Without this, you won’t be able to complete the mortgage calculator accurately and will not be able to get a proper estimation. In addition, you need to decide which type of mortgage you need, because picking the wrong mortgage can end up costing you a lot of money.

To learn more about the different types of mortgages and which one works best for you, please read our comprehensive guide on comparing mortgages.

Does OneDome have a mortgage calculator?

Yes! Mortgage Passport is a OneDome tool designed to pre-qualify you for a mortgage. You can fill in the Mortgage Passport, then browse over 90+ lenders and 12,000+ mortgage products. The best part? Mortgage Passport pre-qualifies you for a Mortgage in Principle, which helps you stand out from other buyers.

I have a question…

If you have a burning question at any point in your application, you can always turn to our friendly team of mortgage advisors. They’re all well versed in everything about mortgages and they can provide personalised, informed offers from a variety of our lenders. Also, our advisors will help you choose the mortgage that suits your needs as a home buyer, working to get you monthly mortgage payments you can easily manage.

How can OneDome help me get a mortgage?

As the UK’s first transactional property portal, we cover every step of the home moving journey, including mortgages. Above all, we make applying for a mortgage a simple experience thanks to our convenient tool, the Mortgage Passport. In addition to working like a mortgage calculator, you can use your Mortgage Passport to stand out from other buyers. It pre-qualifies you for a Mortgage in Principle, showing sellers that you’re in a genuine position to buy. You can also connect with our mortgage advisors, who will help you decide which mortgage works for you.

If you have any questions about mortgages or how else OneDome can help, speak to our mortgage advisors directly on 0203 8686 262 between 09:00 and 17:00.


The smart way to find a mortgage

If you’d prefer to talk to a mortgage advisor directly, you can call 0203 8686 262 between 09:00 and 17:00

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Find an estate agent is a trading name of OneDome Ltd and is not a mortgage intermediary. makes introductions to CMME Mortgages & Protection Ltd to provide mortgage solutions. OneDome Ltd and CMME Mortgages & Protection Ltd are part of the same group of companies. OneDome Ltd may receive an introduction fee from CMME Mortgages on completion of successful mortgage applications. This fee is based on a percentage of your loan amount. CMME Mortgages & Protection Ltd is registered in England and Wales (04886692) and is authorised and regulated by the Financial Conduct Authority and is on the Financial Services Register (414798).
Your home may be repossessed if you do not keep up repayments on your mortgage.