Nominal vs Real Returns: Why Inflation Changes the Number
Nominal vs real returns show whether inflation is eating your gains. Learn the quick maths and practical checks UK investors should use.
Nominal vs real returns matter because a portfolio statement can show growth while inflation quietly erodes what that money can buy in everyday life. This guide explains, in plain English, what nominal and real returns mean, how inflation changes the numbers you see, and how to do a quick mental check on whether your investments have actually moved you forward.
The Short Version
- Nominal return is the headline growth number on your statement before inflation is considered.
- Real return adjusts that growth for inflation, so it reflects what your money can actually buy.
- A positive nominal return can still leave you worse off if prices rose faster than your portfolio.
- For everyday investing decisions, a quick inflation check is often enough to tell whether progress is real or only nominal.
Nominal return: the number on the statement
A nominal return is the raw, unadjusted return you see reported on an investment statement, in a fund factsheet, or in a marketing summary. It is simply how much your money grew, in pounds, before anything else is considered.
For example, if you put £10,000 into an investment and a year later it is worth £10,600, your nominal return is 6%. That figure is correct, and it is the number you will see quoted almost everywhere. The catch is that it does not tell you what that growth is actually worth.
Real return: the number that reflects what you can actually buy
A real return is your nominal return adjusted for inflation. It estimates how much your purchasing power has changed, rather than just how the pound figure on the screen has changed.
Purchasing power is a simple idea: how much your money can actually buy. If your money grows by 6% but the things you usually buy get 8% more expensive, you can afford less than you could a year ago, even though your account balance is higher. Your wealth, in any meaningful sense, has gone backwards.
Real returns are sometimes called inflation adjusted returns, and thinking in these terms is the foundation of purchasing power investing: judging progress by what your money can do in the real world, not just by the number on screen.
Why inflation changes the picture
Inflation is the general tendency for prices in an economy to rise over time. It is measured as a percentage, using baskets of goods and services to track how the cost of typical spending changes.
Two effects combine to confuse beginner investors: a positive return is easy to read as success at a glance, and inflation is rarely shown on the same page as your portfolio results.
You can read about how UK inflation is currently measured on the Office for National Statistics inflation and price indices page, and about the Bank of England perspective in its inflation explainer. Those are useful reference points when you want to sense-check what number belongs in your own calculation.
The rough rule for converting between nominal and real
The full, precise version of the conversion is a bit fiddly, because percentages do not subtract cleanly. A simple approximation is good enough for everyday sense-checking:
Real return (approximate) = Nominal return minus inflation rate
So if your investment grew 6% and inflation was 3%, your real return is roughly 3%. If inflation was 7%, your real return is roughly minus 1%, even though your account balance is up.
For a closer figure, the classic relationship is:
Real return = (1 + Nominal return) divided by (1 + Inflation rate) minus 1
You do not need to memorise either formula. The point is that the simple subtraction is close enough for a quick check, and the more accurate version exists when you want to be precise. The US Securities and Exchange Commission glossary entry on real rate of return gives a clear plain-English overview.
A Worked Example
Imagine three investors, each starting with £10,000, and each seeing a different combination of growth and inflation over a single year.
| Scenario | Starting amount | Nominal return | Ending amount (nominal) | Inflation rate | Approximate real return | Purchasing power |
|---|---|---|---|---|---|---|
| Calm year | £10,000 | 5% | £10,500 | 2% | about 3% | Modestly ahead |
| High inflation year | £10,000 | 5% | £10,500 | 7% | about minus 2% | Slightly behind |
| Strong year | £10,000 | 9% | £10,900 | 3% | about 6% | Clearly ahead |
Look at the middle row. The account balance is higher, which is the nominal story. But everyday prices rose faster, so the £10,500 buys a bit less than the original £10,000 would have a year earlier. That is the real return, and it is negative.
The point is not that any specific number will repeat. The point is that the same 5% nominal return can mean very different things depending on what inflation does that year. Inflation and investment returns have to be looked at together, not on their own.
What beginner investors often get wrong
A few common mix-ups around nominal vs real returns are worth flagging now, because they tend to come up again and again.
Confusing growth with progress. A higher balance is not the same as being better off. Only a positive real return means your money goes further in everyday life.
Comparing nominal vs real returns across periods with very different inflation can mislead. A 7% return in a year of 2% inflation is not the same as a 7% return in a year of 8% inflation, even if the headlines look identical.
Ignoring charges, cash balances and time in the market can blur the picture too. Even a healthy real return can be dulled by costs and by sitting on uninvested cash for long stretches. Cristoniq’s guide to cash drag and idle money walks through how money that is not actually working can quietly lower your results.
Reading too much into a single year is another trap. Inflation and returns both bounce around. A single bad year for real returns does not mean your long-term plan is broken, just as a single good year does not prove it is working.
What This Means For You
Start with a simple habit: whenever you look at a one-year return, ask what inflation did over roughly the same period. That one question stops a lot of false comfort.
If you are comparing funds or accounts, check costs at the same time. A nominal gain can look healthy until inflation, charges and idle cash are all taken into account together. Cristoniq’s guides to risk ratings on funds, default funds in pensions and what it actually costs to invest in shares help put those pieces on the same page.
You do not need to calculate real returns every week. You do need to understand whether your plan is protecting and growing purchasing power over time, because that is what eventually matters when you spend the money.
In Plain English
Nominal return is the story your account tells you. Real return is the story your life tells you after inflation has taken its share.
Once you start checking nominal vs real returns side by side, the number on the statement stops being the whole picture. Your expectations become more realistic, and your decisions usually become calmer.
This article is for general financial education only. It is not financial advice or personal investment advice. Investments can fall as well as rise, and you may get back less than you invest.