Jodie HumphriesJodie HumphriesFeb 09, 2021(2 min read)

A mortgage calculator is an extremely helpful tool when planning to take out a home loan and working out the costs. Although each mortgage calculator you come across may be slightly different, most will help you estimate how much your repayments will be. The calculator will often also show you the difference in repayments if you repay weekly, monthly or fortnightly. 

To calculate these figures, you’ll be asked to enter a few details. These include the amount you plan to borrow, whether you’re an owner-occupier or an investor, the proposed interest rate and the home loan term. It will also often show you the total interest you’ll be charged and the total amount you’ll repay over the life of the loan.  

Understanding how the mortgage calculator works, helps you to use it to see how different loan amounts, interest rates and terms affect your repayments. This can then help you choose a home loan that you can repay comfortably and save on interest costs. The mortgage calculator lets you compare the benefits and costs of home loans from different lenders to help you make a more informed choice. Use a mortgage calculator to help identify which home loan is most suitable for your requirements and financial situation.

Related FAQ's

How does a mortgage calculator work?

A mortgage calculator is an extremely helpful tool when planning to take out a home loan and working out the costs. Although each mortgage calculator you come across may be slightly different, most will help you estimate how much your repayments will be. The calculator will often also show you the difference in repayments if you repay weekly, monthly or fortnightly. 

To calculate these figures, you’ll be asked to enter a few details. These include the amount you plan to borrow, whether you’re an owner-occupier or an investor, the proposed interest rate and the home loan term. It will also often show you the total interest you’ll be charged and the total amount you’ll repay over the life of the loan.  

Understanding how the mortgage calculator works, helps you to use it to see how different loan amounts, interest rates and terms affect your repayments. This can then help you choose a home loan that you can repay comfortably and save on interest costs. The mortgage calculator lets you compare the benefits and costs of home loans from different lenders to help you make a more informed choice. Use a mortgage calculator to help identify which home loan is most suitable for your requirements and financial situation.

How can I calculate interest on my home loan?

You can calculate the total interest you will pay over the life of your loan by using a mortgage calculator. The calculator will estimate your repayments based on the amount you want to borrow, the interest rate, the length of your loan, whether you are an owner-occupier or an investor and whether you plan to pay ‘principal and interest’ or ‘interest-only’.

If you are buying a new home, the calculator will also help you work out how much you’ll need to pay in stamp duty and other related costs.

How do I calculate monthly mortgage repayments?

Work out your mortgage repayments using a home loan calculator that takes into account your deposit size, property value and interest rate. This is divided by the loan term you choose (for example, there are 360 months in a 30-year mortgage) to determine the monthly repayments over this time frame.

Over the course of your loan, your monthly repayment amount will be affected by changes to your interest rate, plus any circumstances where you opt to pay interest-only for a period of time, instead of principal and interest.

How much are repayments on a $250K mortgage?

The exact repayment amount for a $250,000 mortgage will be determined by several factors including your deposit size, interest rate and the type of loan. It is best to use a mortgage calculator to determine your actual repayment size.

For example, the monthly repayments on a $250,000 loan with a 5 per cent interest rate over 30 years will be $1342. For a loan of $300,000 on the same rate and loan term, the monthly repayments will be $1610 and for a $500,000 loan, the monthly repayments will be $2684.

How do I apply for a home improvement loan?

When you want to renovate your home, you may need to take out a loan to cover the costs. You could apply for a home improvement loan, which is a personal loan that you use to cover the costs of your home renovations. There is no difference between applying for this type of home improvement loan and applying for a standard personal loan. It would be best to check and compare the features, fees and details of the loan before applying. 

Besides taking out a home improvement loan, you could also:

  1. Use the equity in your house: Equity is the difference between your property’s value and the amount you still owe on your home loan. You may be able to access this equity by refinancing your home loan and then using it to finance your home improvement.  Speak with your lender or a mortgage broker about accessing your equity.
  2. Utilise the redraw facility of your home loan: Check whether the existing home loan has a redraw facility. A redraw facility allows you to access additional funds you’ve repaid into your home loan. Some lenders offer this on variable rate home loans but not on fixed. If this option is available to you, contact your lender to discuss how to access it.
  3. Apply for a construction loan: A construction loan is typically used when constructing a new property but can also be used as a home renovation loan. You may find that a construction loan is a suitable option as it enables you to draw funds as your renovation project progresses. You can compare construction home loans online or speak to a mortgage broker about taking out such a loan.
  4. Look into government grants: Check whether there are any government grants offered when you need the funds and whether you qualify. Initiatives like the HomeBuilder Grant were offered by the Federal Government for a limited period until April 2021. They could help fund your renovations either in full or just partially.  

How do I apply for Westpac’s first home buyer loan?

If you’re a first home buyer looking to apply for a home loan with Westpac, they offer an online home loan application. They suggest the application can be completed in about 20 minutes. Based on the information you provide, Westpac will advise you the amount you can borrow and the costs associated with any possible home loan. 

You can use Westpac’s online mortgage calculators to estimate your borrowing power. You can also work out the time it might take to save up for the deposit, and the size of your home loan repayments

When applying for a home loan with Westpac, you’re assigned a home finance manager who can address your concerns and provide information. The manager will also offer guidance on any government grants you may be eligible for. 

What is an interest-only loan? How do I work out interest-only loan repayments?

An ‘interest-only’ loan is a loan where the borrower is only required to pay back the interest on the loan. Typically, banks will only let lenders do this for a fixed period of time – often five years – however some lenders will be happy to extend this.

Interest-only loans are popular with investors who aren’t keen on putting a lot of capital into their investment property. It is also a handy feature for people who need to reduce their mortgage repayments for a short period of time while they are travelling overseas, or taking time off to look after a new family member, for example.

While moving on to interest-only will make your monthly repayments cheaper, ultimately, you will end up paying your bank thousands of dollars extra in interest to make up for the time where you weren’t paying off the principal.