Credit card interest calculator

Work out how much interest you may pay on a credit card balance, based on your interest rate and monthly payments.

Why use an interest calculator?

If you’re paying interest on a credit card balance, you might like to calculate:

  • the potential cost of your borrowing
  • how long it could take to repay your balance
  • how much you could save by making higher monthly payments.

Work out your credit card interest

Just be aware this calculator provides an illustration only. Your actual borrowing costs can vary, depending on how you use and manage your credit card over time.



Total interest: ##interest##

Total to repay: ##total_paid##

Time to repay: ##years## year(s) and ##months## months


Try adjusting the details you’ve provided to see how that affects the interest costs.

This calculator is a guide only, calculated using approximate minimum payment rates that may vary by product or lender. We assume your interest rates always stay the same, and interest and payments are processed at the same time each month.

Could you budget to repay more?

After using our credit card interest calculator, you might be wondering how you can cut your costs.

If you’re paying interest and you don’t have the option to transfer your credit card balance, try to repay as much as you can afford each month. That could save you money in the long term.

You may be interested in our budgeting guides, helping you to make the most of your money.

More about money management

Understanding and minimising costs

Minimum payments

To meet the conditions of your credit agreement, you need to make at least the minimum payment each month. You’ll see that amount on your monthly credit card statements.

To reduce your borrowing costs, try to pay more than the minimum whenever you can.

More about minimum payments

Payment options

We offer several payment options, including Direct Debit, bank transfer and debit card payments. You may like to use a combination to make regular and additional payments.

It’s useful to know that you can make additional payments at any time.


Explore payment options

Learn about interest

When you borrow money on a credit card, you may be charged interest. Worked out as a percentage of whatever you borrow. The higher the rate, the more interest you’ll pay.

More about credit interest

Other fees and charges

In addition to interest, other account fees and charges could apply to your account. These may include fees for selected transactions, or default charges if you miss a payment.

More about fees and charges

Know your credit score

If you use our Mobile Banking app or Internet Banking, you can access the ‘Your Credit Score’ service. A cost and risk-free way to see your TransUnion credit score and report.

Having a good credit score can mean access to lower interest rates and higher credit limits. It can also be helpful if you want to apply for credit in the future, like a loan or mortgage.

More about Your Credit Score

Frequently asked questions

Making sure you get a fair deal

We want you to find a product that's right for your circumstances, which is why we adhere to the Standards of Lending Practice, which are monitored and enforced by the Lending Standards Board.

To find out more you can read the statement of responsibilities, which details what's expected of us, the lender and you, the borrower.

Download the statement of responsibilities (PDF 60kb)