Free multi-lender borrowing calculator

How much can you actually borrow?

Most calculators show one number from one bank. Ours checks multiple NZ banks and lenders — because the difference can be hundreds of thousands of dollars.

Check my borrowing power

Free · No obligation · Takes 2 minutes

Same person. Different bank. Different answer.

Every lender calculates your borrowing power differently.

One lender says

$620,000

Based on their rules

Another lender says

$785,000

Same income, same expenses

That's a $165,000 difference in buying power. Which lender would you rather apply with?

How it works

Enter your details

Income, expenses, deposit and what you're looking for. Takes about 2 minutes.

See your results

Instantly see what you could borrow across multiple NZ banks and lenders, side by side.

Apply online or call us

Ready to move? Complete a full application online, or pick up the phone and we'll guide you through it.

More than just mortgages

We help you buy your home, protect it, and build wealth from it.

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Home loans

First homes, next homes, investment properties, refinancing. We compare across multiple lenders to find your best deal.

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Insurance

Life, health, trauma and income protection. We make sure you and your family are covered if something goes wrong. Complete our quick questionnaire to get started.

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KiwiSaver

Using KiwiSaver for your first home deposit? We can help with the withdrawal process and refer you to a specialist adviser for fund advice.

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Restructuring

Already have a mortgage? We review your structure to save you money and get you debt-free faster.

First home buyers

Buying your first home in New Zealand is one of the biggest financial decisions you'll ever make. The amount you can borrow varies significantly between lenders — their test rates, expense calculations, and policies all differ. That's why checking with just one bank can mean missing out on tens of thousands of dollars in borrowing power.

You may be eligible for a First Home Loan with as little as a 5% deposit through Kainga Ora-backed lending. Your KiwiSaver savings can be used towards your deposit after three years of contributions.

Our calculator shows you what each lender would actually approve — not a rough estimate, but the real calculation based on each bank's methodology. Then when you're ready, you can complete a full application online and we handle the rest.

We don't charge you anything for standard residential mortgage advice — we're paid by the lender when your loan settles.

Common questions

How accurate is the calculator?

Very. Our calculator uses each lender's actual methodology — not a generic formula. The same test rates, expense benchmarks, and income shading that the banks themselves use. Results typically match within a few dollars of the bank's own spreadsheets.

Is this really free?

Yes. The calculator is free, the advice is free, and the application process is free. For standard residential mortgages, we're paid a commission by the lender when your loan settles. We'll always disclose this upfront as required by law.

Will using the calculator affect my credit score?

No. The calculator is an estimate tool only — no credit check is run. A credit check only happens when you formally apply to a specific lender, and we'll always talk to you before that step.

Do I have to use Mortgage Mart after using the calculator?

No obligation at all. Use the calculator, see your results, and decide what you want to do next. If you'd like our help, we're here. If not, no worries.

How much deposit do I need?

Most lenders require 20% for standard lendingor 30% for investment lending. But owner occupiers might only need 10% deposit and first home buyers may qualify for as little as 5% deposit. And sometimes there are special offers. Our calculator factors in your deposit as well as your income, expenses and other factors and shows you how much you are eligible for across all our differentlenders

I already have a mortgage — can you help?

Absolutely. Whether you're coming up for refix, want to restructure, or are thinking about buying an upgrade or investment property, we can review your situation across multiple lenders and find you a better deal.

Where are you based?

We're a New Zealand-wide service. We work with clients from Whangarei to Invercargill — everything is done online and over the phone, so location doesn't matter.