
Australia's inflation rate is calculated using the Consumer Price Index (CPI), which measures the price increase of a defined basket of goods and services that households typically buy. The Australian Bureau of Statistics (ABS) calculates the CPI independently and produces it quarterly, along with a monthly indicator that includes updated prices for about two-thirds of the items in the CPI basket. The Reserve Bank of Australia (RBA) aims to maintain annual consumer price inflation between 2% and 3% to preserve the purchasing power of money and encourage sustainable economic growth. Various factors, including the performance of the mining and agricultural sectors, contribute to Australia's inflation rate.
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What You'll Learn

Consumer Price Index (CPI)
The inflation rate in Australia is calculated using the Consumer Price Index (CPI), which measures the price increase of a defined basket of goods and services that the average consumer spends money on throughout the year. This includes groceries, clothes, rent, power, telecommunications, recreational activities, raw materials, federal fees, and taxes. The CPI is produced and calculated independently each quarter by the Australian Bureau of Statistics (ABS), which also publishes a monthly indicator that includes updated prices for about two-thirds of the items in the CPI basket.
The CPI is a measure of household inflation and captures price changes for goods and services that households typically buy. It is the most well-known indicator of inflation. The Reserve Bank Board sets monetary policy to maintain inflation between 2% and 3% annually, which is believed to preserve the purchasing power of money and encourage sustainable economic growth.
The CPI is calculated using a base year, which is typically set at a convenient round number, such as 100. The prices of the goods and services in the CPI basket are then tracked over time and compared to the base year to calculate the inflation rate. This calculation can be done using the following formula:
> Inflation Rate = ((Current Year CPI – Base Year CPI) / Base Year CPI) * 100
For example, if the base year CPI is 100 and the current year CPI is 105, the inflation rate would be:
> ((105 - 100) / 100) * 100 = 5%
The CPI can also be weighted to reflect the importance of different items in the basket. This is done by assigning a weight to each item based on its contribution to the overall expenditure of the average consumer. For example, housing may have a higher weight than recreation and culture if consumers spend a larger proportion of their income on housing. This weighted CPI can then be used to calculate a weighted inflation rate.
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Product basket
In Australia, the Consumer Price Index (CPI) is the most commonly used method to calculate the inflation rate. The CPI is a measure of the percentage change in the price of a basket of goods and services consumed by households. The Australian Bureau of Statistics (ABS) calculates the CPI by collecting price data for thousands of items across a wide range of categories, including food and energy prices, education, housing, transport, and healthcare. These items are then grouped into 87 expenditure classes and 11 groups. The ABS collects price data from various sources, including department stores, retailers, and supermarkets, and also tracks real estate and utility prices.
The CPI basket of goods and services is designed to represent the typical spending patterns of Australian households. The items included in the basket are those that Australian households spend the most on and consume the most commonly. The prices of these items are weighted and adjusted according to their priority in household expenditure. For example, if households spend a larger portion of their income on a particular product class, that class will be given more weight in the final CPI calculation.
The CPI is calculated by measuring the change in the retail price of the basket of goods and services over time. The ABS collects price data for each item in the basket and tracks the changes in price from one quarter to the next. The price changes for each item are then aggregated to calculate the overall inflation rate for the CPI basket.
The CPI is typically calculated on a quarterly basis, with the ABS publishing the CPI once per financial quarter. However, starting in September 2022, the ABS also began publishing a monthly CPI indicator, providing a more timely measure of inflation in Australia.
The CPI basket of goods and services is updated periodically to reflect changes in household spending patterns. New products are typically not included in the CPI basket as soon as they appear on the market. Instead, they are added once they have reached a high enough market share and are available to most households. Additionally, the CPI weights are regularly updated to ensure they reflect contemporary household spending patterns.
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Trimmed mean
The inflation rate in Australia is calculated using the price increase of a defined product basket, which includes expenses for groceries, clothes, rent, power, telecommunications, recreational activities, and raw materials. The most well-known indicator of inflation is the Consumer Price Index (CPI), which is calculated quarterly by the Australian Bureau of Statistics (ABS).
The Trimmed Mean is a measure of underlying inflation that reduces the impact of irregular or temporary price changes in the CPI. It provides a view of underlying inflation by excluding the largest increases and decreases in a quarter and then taking the average over what remains. This measure is preferred by the Reserve Bank of Australia (RBA) as it gives a more accurate picture of current inflation pressures in the country.
The RBA's mandate involves an inflation target range of 2-3%, with a focus on the 2.5% midpoint. The Trimmed Mean measure is not a target but is a useful indicator of current momentum in inflation. For example, in 2024, the trimmed mean inflation rate was 3.2% (and 2.7% in the second half of the year), which was higher than the target range but provided valuable information about inflationary pressures.
The Trimmed Mean measure is a valuable tool for the RBA and economists to understand the underlying inflationary trends in Australia, beyond the headline inflation figure. By reducing the impact of irregular price changes, it provides insights into the momentum of inflation and helps inform monetary policy decisions.
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Wage Price Index (WPI)
Inflation in Australia is calculated using the price increase of a defined product basket, which includes goods and services that an average consumer spends money on throughout the year. The most well-known indicator of inflation is the Consumer Price Index (CPI), which is calculated independently by the Australian Bureau of Statistics (ABS). The ABS produces the CPI each quarter and publishes a monthly indicator that includes updated prices for about two-thirds of the items in the CPI basket.
The Wage Price Index (WPI) is a measure of changes in the price of labour, unaffected by compositional shifts in the labour force, hours worked, or employee characteristics. The WPI is calculated using data from the Wage Price Index Survey, which collects information on prices for a range of jobs from a sample of private and public sector employers. The survey initially selects approximately 3,300 Australian organisations to produce a subset of about 20,000 eligible jobs, with data submitted electronically over successive quarters.
The WPI is published quarterly by the Australian Bureau of Statistics and includes seasonally adjusted data. For example, in the December 2024 quarter, the WPI rose by 0.7% quarter-on-quarter, which was the equal lowest quarterly rise since the March 2022 quarter. Over the twelve months to the December 2024 quarter, the WPI rose by 3.2% year-on-year.
The WPI also provides insights into wage growth in different sectors. For instance, in the December 2024 quarter, the private sector rose by 0.7% quarter-on-quarter, while the public sector rose by 0.6% quarter-on-quarter. Additionally, the WPI can highlight industries contributing to quarterly wages growth, such as healthcare and social assistance, manufacturing, and construction in the December 2024 quarter.
The WPI is an essential tool for understanding labour market dynamics and wage trends in Australia, providing valuable information for policymakers, economists, and analysts.
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Monetary policy
The Reserve Bank of Australia is responsible for the country's monetary policy. Monetary policy involves setting the interest rate on overnight loans in the money market, known as the cash rate. The cash rate influences other interest rates in the economy, which in turn impacts the behaviour of borrowers and lenders, economic activity, and ultimately the inflation rate.
The Reserve Bank aims to maintain annual consumer price inflation between 2% and 3%. This target is agreed upon with the Australian Government and recorded in the Statement on the Conduct of Monetary Policy. The Bank believes that keeping inflation within this range preserves the purchasing power of money and encourages sustainable economic growth.
To achieve these objectives, the Bank uses various tools and indicators, such as unemployment rates, monetary aggregates, the exchange rate, interest rates, and the balance of payments. The Bank's monetary policy decisions are made independently, with the goal of enhancing the perception and reality of its decision-making autonomy.
Australia's monetary policy and inflation targeting have evolved over time. In the 1970s, Australia experienced relatively high inflation, which rose more sharply than in other OECD countries. This high inflation had significant real costs, distorting investment incentives and increasing uncertainty. In the 1980s, inflation in Australia came down more slowly than in other countries.
The Reserve Bank calculates a "true" underlying inflation index that may exclude certain items or indirect taxes, which is not typical in most inflation-targeting countries.
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Frequently asked questions
The Consumer Price Index (CPI) is the most well-known indicator of inflation.
The CPI is calculated by the Australian Bureau of Statistics (ABS) and captures price changes for goods and services that households typically buy. The ABS produces the CPI each quarter and publishes a monthly indicator that includes updated prices for around two-thirds of the items included in the CPI basket.
The CPI basket includes items such as groceries, clothes, rent, power, telecommunications, recreational activities, raw materials (e.g. gas, oil), federal fees, and taxes.
The target range for annual consumer price inflation is between 2% and 3%. Maintaining inflation within this range is believed to preserve the purchasing power of money and encourage sustainable economic growth.

































