Calculate how inflation affects the future cost of an item and the purchasing power of your money.
This calculator shows how inflation affects the future cost of a fixed amount — either how much an item costing A$X today will cost in the future at an assumed inflation rate, or equivalently, how much of today's purchasing power A$X will retain after a number of years of inflation. It is useful for retirement planning, setting savings targets, and understanding the long-run impact of even modest inflation on the real value of money.
Inflation compounds annually: each year, prices (or costs) increase by the inflation rate, applied to the prior year's level. This produces exponential growth in nominal costs — even a 3% annual rate roughly doubles prices over 24 years.
Formula: Future Amount = Current Amount × (1 + Inflation Rate)Years. Purchasing Power of A$1 today in future dollars = 1 ÷ (1 + Inflation Rate)Years.
Example: An item costing A$1,000 today, with a 3% annual inflation rate (example rate — enter your expected rate) over 10 years, would cost approximately A$1,000 × (1.03)10 = A$1,343.92 in 10 years. Conversely, A$1,000 in 10 years would have the purchasing power equivalent of roughly A$744.09 today. Over 25 years at 3%, A$1,000 today becomes about A$2,093.78 in future dollars — more than doubling in nominal cost.
The Reserve Bank of Australia (RBA) has an inflation target of 2-3% per year on average over the medium term, measured by the Consumer Price Index (CPI). The CPI is published quarterly by the Australian Bureau of Statistics (ABS) and measures price changes across a representative "basket" of goods and services, including housing costs, food, transport, healthcare, and education. Inflation in Australia has been volatile: after a prolonged period of low inflation (often below 2%) through the 2010s and early 2020s, the post-pandemic period saw CPI rise to over 7% in 2022 and 2023 before moderating. The RBA uses the cash rate as its primary tool to influence inflation — raising rates reduces consumer spending and borrowing, slowing price growth. For long-term financial planning, the RBA's 2-3% target is a reasonable baseline assumption for inflation over a multi-decade horizon, though actual inflation can deviate significantly from this over any given period. A practical use of this calculator for Australians: if you want to maintain A$5,000/month purchasing power in retirement in 30 years, at 3% inflation you would need about A$12,136/month in nominal (future dollar) terms — this illustrates why retirement income needs must be expressed in future dollars, not today's dollars, for realistic planning.
The Reserve Bank of Australia targets inflation of 2-3% per year on average over the medium term, as measured by the trimmed mean CPI (which strips out the most volatile price movements). When inflation rises above this band, the RBA typically raises the cash rate to reduce spending and credit growth; when inflation falls below, it may lower rates to stimulate economic activity. The 2-3% target has been in place since the early 1990s and has anchored long-run inflation expectations.
Inflation erodes the purchasing power of money held in cash or low-return accounts. If your savings account earns 3% interest but inflation is running at 3%, the real return is 0% — your balance grows nominally but buys the same amount of goods. To build real wealth over time, your investments need to earn a return above inflation (a positive real return). Shares and property have historically provided positive real returns in Australia over long periods, while cash and short-term deposits have provided near-zero or sometimes negative real returns during high-inflation periods.
The headline CPI measures price changes for a broad basket of goods and services and can be volatile because it includes items like petrol and fresh food that have large price swings. "Underlying inflation" measures (such as the trimmed mean and weighted median) strip out the most extreme price movements each quarter to give a better indication of persistent inflation trend. The RBA focuses on the trimmed mean CPI (also called underlying inflation) for its policy decisions, while the headline CPI is the more widely reported figure.
HECS-HELP debt is indexed annually on 1 June each year by the CPI increase (specifically the March quarter CPI). This means the nominal balance of your HECS-HELP debt grows with inflation each year, but your debt's real value stays roughly constant — inflation indexation is not the same as charging interest. In years of high CPI (such as 2022-23 when CPI rose by about 7%), HECS-HELP balances increased by this percentage, which surprised many students and graduates. In low-inflation years, the increase is minimal.
For projecting how much a future retirement income needs to be in nominal terms, CPI is the right measure — it tells you how much your intended basket of goods and services will cost. Wage growth (historically slightly above CPI in Australia) is relevant if you are setting a retirement income target as a percentage of your expected future wages, or if you want to maintain your living standard relative to society. For most retirement planning purposes, CPI is the appropriate assumption — use 2.5-3% for a long-term RBA-target-based estimate.
Australian annual CPI inflation was broadly below 2% from 2014 to 2021. It then rose sharply post-pandemic, reaching a peak of around 7-8% (headline) in late 2022 to early 2023, driven by global supply chain disruptions, energy prices, and strong domestic demand. Inflation moderated through 2023 and 2024 as the RBA raised the cash rate significantly from a record low of 0.1% to 4.35%. For long-term planning, current elevated inflation rates should not be extrapolated indefinitely — the RBA's 2-3% medium-term target is the standard long-run planning assumption.
Disclaimer: The information and figures provided on this page are for educational and illustrative purposes only and do not constitute financial advice. The inflation rate used is an example only — actual future inflation is unknown and can differ significantly from historical rates or the RBA's target. This calculator uses constant annual compounding and does not model variable inflation over time. Consult a qualified financial adviser for long-term financial planning advice specific to your circumstances.