What Is the Difference Between Nominal and Real Returns?
Nominal and real returns describe investment performance in two different ways.
A nominal return shows how much an investment gained or lost in monetary terms before inflation is taken into account. A real return adjusts that performance for inflation to show how the investment’s purchasing power changed.
Suppose you invest £10,000 and its value increases to £10,800.
The investment has gained £800:
£10,800 − £10,000 = £800
Relative to the £10,000 starting value, that represents an 8% nominal return:
£800 ÷ £10,000 × 100 = 8%
If inflation was 3% over the same period, however, prices were also rising while the investment was growing. The investment’s purchasing power therefore increased by less than 8%.
Using the precise inflation-adjusted calculation, an 8% nominal return with 3% inflation produces a real return of approximately 4.85%.
Nominal Return
Measures the investment’s gain or loss in monetary terms before adjusting for inflation. If £10,000 grows to £10,800, the investment has produced an 8% nominal return.
Real Return
Adjusts the investment return for inflation to show how purchasing power changed. If the nominal return is 8% and inflation is 3%, the precise real return is approximately 4.85%.
Neither figure is more correct. They answer different questions about the same investment performance: nominal return describes the change in money terms, while real return shows how that performance compares with inflation.
This distinction matters because an increase in the number of pounds you have does not necessarily mean your purchasing power increased by the same percentage.
The Investment Return Calculator can help you calculate the percentage return produced between known starting and ending investment values. That provides the nominal investment return before considering how inflation affected its purchasing power.
How Does Inflation Change an Investment Return?
Inflation reduces the purchasing power of money because prices generally become higher over time.
This means an investment can increase in monetary value while part of that increase is effectively offset by rising prices.
Consider a simplified example using £100.
If £100 is invested and produces an 8% return, it becomes:
£100 × 1.08 = £108
Now suppose something that cost £100 at the beginning of the period increases in price by 3% because of inflation.
Its new price is:
£100 × 1.03 = £103
The investment has grown from £100 to £108, but the price level represented by the £100 example has risen to £103.
The investor therefore has more purchasing power than before, but not 8% more.
This is the idea captured by a real return.
Nominal return measures how much the investment grew. Real return compares that growth with the increase in prices.
Inflation does not make the nominal return incorrect. The investment still genuinely increased by 8% in monetary terms. Adjusting for inflation simply provides another perspective on what that increase meant for purchasing power.
How Inflation Affects Investments explores the wider relationship between rising prices and investment performance.
How Do You Estimate a Real Return?
A quick way to estimate a real return is to subtract the inflation rate from the nominal investment return:
Approximate real return = Nominal return − Inflation rate
For example, suppose an investment produces an 8% nominal return while inflation is 3%.
Why isn’t the exact answer 5%?
Investment returns and inflation are both percentage changes. The precise calculation compares the growth in the investment with the growth in prices rather than simply subtracting one percentage from another.
The exact formula is:
Real return = ((1 + Nominal return) ÷ (1 + Inflation rate)) − 1
For the 8% return and 3% inflation example, this produces approximately 4.85%.
You do not need to perform the full calculation every time you want a quick indication of the effect of inflation. Subtraction can be useful for an estimate.
But it is important to recognise the distinction between an estimate and the precise result. What Is a Real Rate of Return? explains the exact calculation and why the formula works in more detail.
What Happens When Investment Returns and Inflation Differ?
The relationship between the nominal return and inflation determines whether purchasing power increased, remained broadly unchanged or decreased.
The examples below use the precise real-return calculation rather than simple subtraction.
These examples show how the relationship between an investment’s nominal return and inflation affects its real return. A positive nominal return does not automatically mean purchasing power increased. What matters for the real return is how the investment’s performance compares with inflation over the same period.How Investment Returns Compare With Inflation
Return above inflation
Return matches inflation
Return below inflation
When the investment return is higher than inflation, the real return is positive.
When the investment return and inflation rate are the same, the precise real return is 0%. The investment has increased in monetary value at the same rate as the general price level in this simplified comparison.
When inflation is higher than the investment return, the real return becomes negative even though the nominal investment return may still be positive.
This is one of the most important reasons for distinguishing between nominal and real returns.
Can a Positive Return Still Leave You Worse Off After Inflation?
Yes. An investment can produce a positive nominal return while losing purchasing power.
Suppose £10,000 produces a 3% nominal return.
Its value becomes:
£10,000 × 1.03 = £10,300
The investment is worth £300 more, so its nominal return is clearly positive.
Now suppose inflation during the same period is 5%.
Something that cost £10,000 at the beginning of the period would cost £10,500 after a 5% increase in prices.
The investment has therefore increased from £10,000 to £10,300 while the general price level in this simplified comparison has increased from £10,000 to £10,500.
Using the precise formula:
((1 + 0.03) ÷ (1 + 0.05)) − 1 ≈ −1.90%
The investment has produced:
Nominal return: +3%
Real return: approximately −1.90%
The number of pounds held in the investment has increased, but those pounds have less purchasing power relative to the beginning of the period.
This does not mean the 3% nominal return was wrong. It means the two measurements are answering different questions.
The nominal return tells you the investment increased in monetary value. The negative real return tells you that the increase did not keep pace with inflation.
Why Do Real Returns Matter Over Longer Periods?
The distinction between nominal and real returns can become particularly useful when looking across longer periods.
An investment balance may become substantially larger over many years, but prices can also rise throughout that time.
For example, seeing that an investment has doubled in monetary value tells you something important about its nominal growth. It does not, by itself, tell you that its purchasing power has doubled.
If prices also increased substantially during the same period, the increase in what the investment can actually buy will be smaller than the increase in its monetary value.
This can matter when interpreting money intended for goals many years into the future. The eventual number of pounds is important, but so is what those pounds will be able to buy when the money is needed.
Real returns provide a way of considering investment performance relative to that changing purchasing power.
This does not make nominal returns less useful. It simply means that inflation becomes another relevant part of the picture when interpreting investment performance over time.
How Should You Compare Nominal and Real Returns?
When comparing investment-return figures, it is important to check whether they are being presented on the same basis.
A nominal return should generally be compared with another nominal return if you want to compare performance before adjusting for inflation.
Similarly, if you are comparing real returns, the figures should both have been adjusted for inflation on a consistent basis.
Comparing an 8% nominal return for one investment with a 6% real return for another as though the two percentages measure exactly the same thing would mix two different measures.
The period being measured also matters. The inflation adjustment should relate to the same period as the investment return.
A useful way to interpret the figures is therefore to ask:
Is this return nominal or real?
What period does it cover?
If it is real, what inflation measure has been used?
Those questions help establish what the percentage actually represents before drawing conclusions from it.
Neither nominal nor real return tells you everything about an investment. They do not, by themselves, show how much its value fluctuated, the level of investment risk involved or what it will return in the future.
They are measurements of performance, viewed from two different perspectives.
Conclusion
Nominal and real returns describe the same investment performance in different ways.
A nominal return shows how much an investment gained or lost in monetary terms before inflation is considered.
A real return adjusts that performance for inflation to show how the investment’s purchasing power changed.
If an investment returns 8% while inflation is 3%, subtracting the two gives a quick estimated real return of 5%. The precise calculation produces approximately 4.85% because it compares the investment’s growth with the increase in prices.
The distinction becomes especially important when inflation is higher than the investment return. An investment can produce a positive nominal return while producing a negative real return, meaning its monetary value increased but its purchasing power fell.
Neither measurement replaces the other.
Nominal return tells you what happened to the investment in money terms. Real return tells you what that performance meant after allowing for inflation.
What Is a Real Rate of Return? takes the next step by explaining the precise inflation-adjusted calculation and how to interpret the result.
