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Car Finance Calculator - Calculate Your Repayments

Looking to buy a new car? We’ll do the maths for you and list must-know tips to help you reduce the interest rate you pay.
Updated 5 April 2025
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​Our Calculator Makes The Numbers Clear
If you want car finance or a car loan, our easy to use repayment calculator will help you work out you will pay weekly, fortnightly or monthly, and what each lender may charge.

Christopher Walsh, MoneyHub's Founder and Head of Research, shares his views on car finance:
  • Car finance can get be a great deal or very expensive - please avoid rushing into a "bad deal" by carefully considering your options. I've written about the risks in Stuff.co.nz and continue to challenge the market.
  • Our calculator uses lending rates and is designed to help you see the options available; we believe comparing online is the best place to start. Once you're in a car yard, there's very little you can do - the pressure is high, and the temptation to 'drive it away today' is huge, but so is the risk of overpaying for your car loan.
  • Our car finance comparison research highlighted three leading car finance lenders that reliably and consistently offer fair interest rates to the majority of borrowers. 
  • We suggest contacting dedicated car loan specialist Simplify - their team has a proven track record of offering market-leading interest rates and terms.
  • Low-fee personal lenders such as Harmoney offer car lending and offers a 100% online application process.
  • If you are thinking about getting a guarantor on a car loan, our Car Loan Guarantors guide outlines what you need to know.
  • Advertising Disclosure: We may receive a commission if you take out a loan, but this does not influence our shortlist. Interest rates vary based on each borrower. 
Christopher Walsh
MoneyHub Founder

Car Finance Calculator

Calculate Your Interest and Repayment Costs
To find out what you will pay monthly and in total for your car finance, simply insert:
  1. The loan amount (the total amount of money you want to borrow)
  2. The loan length (how long you want to repay the loan)

Know this first:
  • The repayment amounts exclude any upfront fees and/or ongoing fees a lender may charge.
  • The interest rates below represent each lender's lowest rate. This is not necessarily the rate you will receive, and for this reason, we suggest considering your options carefully and arranging multiple quotes.

Enter Loan Information

Amount to Borrow

Repayment Period (Months)

Important: Our calculations are based on the assumption that you make the same fixed car repayment for the entire repayment period, the interest rate does not increase or decrease, you don't miss any repayment deadlines, overpay or underpay. ​
Christopher Walsh
MoneyHub Founder
​MoneyHub's Top Car Finance Options - Avoid high interest rates and fees with our trusted lenders.
  • We focus on highlighting the top car finance options to help you avoid costly high interest rates and unnecessary fees that add up too quickly. Our extensive research has consistently highlighted two trusted lenders who offer fair, competitive interest rates for most borrowers.
  • Simplify – A dedicated car loan specialist, Simplify has built a strong reputation for offering some of the most competitive rates and terms in the market. For 2024, we've named them our Favourite Car Loan Lender for their customer-focused approach and proven ability to get New Zealanders into cars with great finance deals. 
  • Harmoney – If you prefer a low-fee personal lender with an easy, fully online process, Harmoney is a great option for secured car loans. Their streamlined application can help you secure a loan quickly and efficiently.
  • Why Compare? Comparing car finance options can save you thousands. Even a 1% lower interest rate can significantly reduce your repayments. While dealership financing might seem convenient, it often comes with higher costs to boost their profits. By exploring different lenders and brokers (such as Simplify and Harmoney), you can secure a better deal, avoid unnecessary markups, and ensure you're not overpaying for your car.
  • Important: The interest rate you lock in now will impact your repayments for years to come, so choose wisely and compare before committing.
  • Advertising Disclosure: We may receive a commission if you proceed with a loan through our partners. However, this does not influence our recommendations, and all lenders are thoroughly vetted for fairness. Rates vary based on individual credit profiles.

Car Finance Calculator Frequently Asked Questions

How much should I borrow to buy a new car?

We suggest spending no more than 10% of your monthly pre-tax income on car repayments. For example, if you earn $30,000 a year after tax, that's around $300 per month. This leaves you money for essential expenses and everyday items, as car insurance, WOF and petrol.

How accurate is the Car Finance Calculator?

The calculations are estimates based on listed lenders' and brokers' current starting interest rates. Please remember that rates may vary based on affordability, loan preference and general market conditions. Because there are many variables, we suggest arranging several quotes. 

What should I consider before applying for car finance?

You'll need to consider your budget, the total cost of the loan (including interest and fees), the loan term, and the lender's reliability. Reading MoneyHub's car finance guide for detailed information will also help you avoid being overcharged or stuck in a poor-value finance deal.

Does the Car Finance Calculator consider fees?

The calculator focuses on interest rates and repayments. You should also consider any upfront or ongoing fees a lender may charge, which can affect the total cost of the loan.

How can I get the best car finance deal?

Compare offers from multiple lenders, negotiate terms, and consider all aspects of the loan, not just the interest rate. Reading MoneyHub's guides and reviews can also provide valuable insights.

Can the Car Finance Calculator help me decide between a new and used car?

Yes - the Car Finance Calculator compares the ongoing costs of financing new and used cars. By inputting different loan amounts and terms, you can see how choosing a new or used vehicle affects your monthly payments and the total interest paid over the loan's life. 

This comparison is crucial, as new cars tend to depreciate faster but may have lower interest rates, while used cars might be cheaper overall but could come with higher interest rates.

Related Guides: Get the Best Car and Car Finance Deal

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Popular Comparisons
Popular Guides
Car Finance Company Reviews:
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​Advertising Disclosure: MoneyHub may receive a payment if you make a purchase on our website. Such commercial arrangements have no influence on our independent reviews of financial products. Please refer to our advertising policy for more details.