How to Use the Inflation Calculator
The Inflation Calculator shows you how the purchasing power of money changes over time — both historically and as a projection. It answers questions like 'what would £1,000 in 1990 be worth today?' and 'how much will £50,000 need to be in 20 years to maintain its value?'
Enter a starting value, your start year, and either an end year or a projected annual inflation rate. The tool calculates the equivalent value in today's money using official CPI (Consumer Price Index) data for historical calculations, or your chosen rate for future projections.
A critical nuance is that official inflation figures are averages across a broad basket of goods. Your personal inflation rate depends on what you spend money on. Tuition, healthcare, and housing have historically inflated far faster than the headline CPI. Retirees often experience higher effective inflation because healthcare costs more as you age.
📊 Worked Example
What £50,000 is worth over time at 2.5% average inflation:
- In 10 years: equivalent to £39,200 today (lost £10,800 in value)
- In 20 years: equivalent to £30,700 today
- In 30 years: equivalent to £24,000 today
- $1,000 in 1990 = $2,380 in 2024 (US CPI data)
Common Use Cases
- ✅ Understanding how much purchasing power has been lost on cash savings
- ✅ Projecting how much you'll need in retirement to maintain your standard of living
- ✅ Calculating historical equivalents for salary comparisons
- ✅ Stress-testing investment returns against inflation to see real returns
- ✅ Understanding the impact of inflation on fixed pension incomes
- ✅ Adjusting a savings goal for future inflation
- ✅ Comparing the real value of wages over different decades
Frequently Asked Questions
What is inflation?
Inflation is the rate at which the general level of prices in an economy rises over time, reducing the purchasing power of money. It's measured by tracking a 'basket' of goods and services. The UK uses CPI (Consumer Prices Index) and the US uses CPI-U as official measures.
What causes inflation?
Inflation has multiple causes: demand-pull (too much money chasing too few goods), cost-push (rising production costs passed to consumers), and built-in/wage-price spirals. Central banks manage inflation primarily through interest rates — raising rates reduces borrowing and spending, cooling inflation.
What is the Bank of England / Federal Reserve inflation target?
Both the Bank of England and Federal Reserve target 2% annual inflation. This level is considered optimal — high enough to avoid deflation's dangers (which discourage spending) but low enough to be manageable. The 2022–2023 inflation surge saw UK CPI peak at 11.1% and US CPI at 9.1%.
How does inflation affect savings and investments?
Cash savings lose real value when inflation exceeds your interest rate. If your savings account pays 3% and inflation is 4%, your real return is -1%. Equities and property have historically outpaced inflation over long periods. Index-linked bonds (gilts, TIPS) are specifically designed to protect against inflation.
What is 'real' vs 'nominal' return?
Nominal return is the headline return on an investment before adjusting for inflation. Real return is what you actually gain in purchasing power: Real Return ≈ Nominal Return − Inflation Rate. A 7% nominal return during 3% inflation gives a 4% real return. Always consider real returns when planning long-term.