Inflation-Adjusted Returns Calculator
A 7% investment return sounds great — but after 2.5% inflation, your real return is closer to 4.4%. This calculator shows you the true purchasing power of your future balance, not just the headline number.
Return & inflation inputs
Why nominal returns can be misleading
When your savings account or investment account shows a percentage return, that is the nominal return — the raw number. But money loses purchasing power over time due to inflation. A coffee that costs £3 today will cost around £4 in 10 years at 3% inflation. Your money needs to grow just to stay in place.
This means that an investment returning 5% in an environment of 4% inflation is only producing about 1% real growth. You are barely outpacing the rising cost of living. Understanding the real return on your savings is essential for realistic financial planning.
Worked example
You invest £10,000 earning 7% annually for 20 years with 2.5% annual inflation.
| Metric | Value |
|---|---|
| Nominal value after 20 years | £38,697 |
| Real value (today's purchasing power) | £23,760 |
| Real annual return (Fisher equation) | 4.39% |
| Purchasing power lost to inflation | £14,937 |
Your account says £38,697 — impressive. But in terms of what that money will actually buy compared to today, it's equivalent to £23,760 in today's money. Inflation silently took nearly 39% of your purchasing power gain.
How to genuinely beat inflation with investing
To grow your real wealth, your nominal return must comfortably exceed inflation — and also exceed any fees, taxes, and costs involved. Historically, broad equity index funds have produced real returns of 4–6% annually over long periods. Cash savings accounts often struggle to match inflation, particularly during low-interest-rate periods.
This is one reason why investing — despite the volatility and risk — is generally considered important for long-term wealth preservation. It is not about getting rich quickly; it is about not getting poorer slowly.
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