INFLATION PURCHASING POWER CALCULATOR

Understanding Inflation Purchasing Power for 2026/27

UK inflation has dominated financial planning since 2022, when CPI peaked at 11.1% — the highest rate in 41 years. The underlying question everyone faces is simple but critical: what is a given amount of money actually worth in real terms across different years? A £30,000 salary in 2010 had the purchasing power of roughly £45,000 in 2026. A £100,000 house deposit saved today will be worth considerably less in real terms by the time you buy in 5-10 years.

The calculator above uses official UK Consumer Prices Index (CPI) data from the Office for National Statistics to convert any amount between any two years from 1989 to 2026. It works bidirectionally: either "what was £X in year A worth in year B?" or "how much do I need today to match a fixed sum from year A?". This is invaluable for retirement planning (modelling how much annual income you’ll need in 30 years), salary negotiations (is your "raise" actually a real-terms pay cut?), and historical comparisons.

The Bank of England targets 2% CPI inflation, but reality has been volatile. Over the past decade, real wages have barely grown — meaning that much of the headline salary growth in the 2010s and 2020s was eaten by inflation. Understanding the difference between nominal (cash terms) and real (purchasing power) values is one of the most important skills for long-term financial planning, and the inflation calculator makes it concrete with your exact numbers.

Key Figures for the 2026/27 Tax Year

• Bank of England inflation target: 2% CPI
• Data source: ONS Consumer Prices Index (CPI)
• Date range available: 1989 – 2026
• UK CPI peak (recent): 11.1% in October 2022
• Historical average UK inflation: Roughly 2.5-3% long-term
• Rule of 72 for inflation: Money halves in purchasing power every 72 ÷ inflation % years
• Bidirectional conversion: Past to today or today to past

How to Use the Inflation Purchasing Power Calculator

1. Enter the starting amount (in pounds).
2. Select the starting year from the dropdown (1989 onwards).
3. Select the ending year from the dropdown.
4. Review the equivalent amount in today's purchasing power.
5. Use the bidirectional toggle to flip the direction (past-to-today or today-to-past).
6. Use the results to understand salary history, savings erosion, or retirement income needs.

Frequently Asked Questions

What is UK inflation currently?

UK inflation changes monthly — check the most recent CPI release from the Office for National Statistics for the exact current rate. The Bank of England targets 2% CPI but inflation has varied from negative rates in 2015 to a peak of 11.1% in October 2022. The calculator uses the latest published annual CPI figures for accurate conversions.

What is the difference between CPI and RPI?

CPI (Consumer Prices Index) and RPI (Retail Prices Index) are two different measures of UK inflation. CPI is the official target used by the Bank of England and excludes owner-occupier housing costs. RPI includes housing costs and uses a different mathematical formula, resulting in typically higher rates. RPI is still used for some specific purposes (student loans, index-linked gilts) but is no longer a "National Statistic".

How much did £100 in 1990 grow to by 2026 in real terms?

Roughly £230-£250 depending on the exact final CPI figure used. This reflects total cumulative inflation of around 130-150% over 36 years — an average of 2.3-2.5% per year compounded. The calculator gives you the precise number using official ONS data.

Why does inflation matter for retirement planning?

Inflation erodes purchasing power over time. A £30,000 annual income that feels comfortable today will be worth significantly less in 20-30 years. If you retire at 60 and live to 90, your retirement spans 30 years of inflation. A retirement plan that doesn't account for inflation will leave you impoverished in later years — which is why drawdown plans typically inflate withdrawals by CPI each year.

How can I protect my savings from inflation?

Cash loses real value during inflation. Assets that historically beat inflation include equities (shares), property, and certain inflation-linked bonds (index-linked gilts, TIPS). Within ISAs and SIPPs, diversified global equity funds have historically returned 3-5% above inflation over long periods. Short-term cash for emergencies is essential, but long-term savings should usually be invested rather than held as cash.

Is a salary increase above inflation a real raise?

Yes. A "real" pay rise is one that exceeds the inflation rate — if inflation is 3% and you get a 4% raise, your real pay grew by about 1%. If inflation is 5% and you get a 3% raise, that's a real-terms pay cut of about 2%. Over the past decade, UK real wages have barely grown — much of the nominal salary growth has been absorbed by inflation.

Related Calculators

• UK Take-Home Pay Calculator — see your actual net pay in current terms
• Compound Interest Calculator — compound your savings to beat inflation
• Retirement Pension Calculator — apply inflation to retirement income planning
• Pension Drawdown Calculator — model 30+ years of retirement income in real terms

Official Sources

• ONS inflation and price indices (official data source)
• Bank of England inflation and monetary policy
• Latest UK Consumer Prices Index bulletin

Last reviewed April 2026. Figures and rules apply to the 2026/27 UK tax year. This tool is for guidance only and does not constitute financial advice.