Finance & Business
Inflation Calculator
Calculate how inflation affects the purchasing power of money over time
Reviewed by the calculator.uk.com Team · Last reviewed 2 July 2026 · Our methodology
Enter values to see how inflation affects your money's purchasing power over time
Related to Inflation Calculator
The inflation calculator uses the principle of purchasing power to show how inflation affects the real value of money over time. It applies a compound inflation rate to determine how much your money will be worth in the future, considering the erosion of purchasing power due to rising prices.
The Calculation Process
The calculator uses the formula: Future Purchasing Power = Present Value / (1 + r)^n, where 'r' is the annual inflation rate (as a decimal) and 'n' is the number of years. This formula accounts for the compounding effect of inflation over time, showing how the same amount of money will buy fewer goods and services in the future.
For example, if you have £1,000 today and inflation is 2% per year, after 10 years your money would still be £1,000 nominally, but its purchasing power would be reduced to approximately £820.35. This means that while you still have the same amount of money, it would only buy about 82% of what it could buy today.
The calculator provides three key metrics to help you understand the impact of inflation on your money's value over time. The results show both the nominal value (which stays the same) and the real value (purchasing power) of your money after the specified period.
Key Metrics Explained
Initial Amount: The starting value of your money in today's terms.
Future Purchasing Power: What your money will be worth in real terms after inflation.
Loss in Value: The difference between your initial amount and its future purchasing power, representing the impact of inflation.
The graph visualizes the decline in purchasing power over time, helping you see the gradual erosion of your money's value. This can be particularly useful for long-term financial planning, such as retirement savings or investment strategies.
1. Why does inflation matter for my finances?
Inflation matters because it reduces the purchasing power of your money over time. If your savings or investments don't grow at least as fast as inflation, you're effectively losing money in real terms. Understanding inflation helps you make better financial decisions and plan for the future.
2. How can I protect my money against inflation?
There are several strategies to protect against inflation: investing in assets that typically appreciate faster than inflation (like stocks or real estate), choosing inflation-protected securities (TIPS), maintaining a diversified investment portfolio, and regularly reviewing and adjusting your financial strategy.
3. What is a normal rate of inflation?
In most developed economies, central banks typically target an inflation rate of around 2% per year. However, actual inflation rates can vary significantly based on economic conditions, government policies, and external factors. It's important to use current inflation rates when planning for the future.
4. Should I consider inflation when planning for retirement?
Yes, considering inflation is crucial for retirement planning. A retirement fund that seems adequate today might not provide sufficient purchasing power in 20 or 30 years. This calculator can help you understand how much you need to save to maintain your desired standard of living in retirement.
5. What is the scientific source for this calculator?
This calculator applies the standard formula for adjusting a value for inflation over time, dividing or multiplying by the compounded inflation rate to express a past or future amount in today's purchasing power terms. In the UK, the Office for National Statistics publishes the Consumer Prices Index (CPI) that measures this kind of price change nationally, and the same compounding logic used here underlies how CPI-linked figures are adjusted in practice.