What Is Real Return?

Real return is an investment's return after inflation has been stripped out. It shows not how much your money grew in numbers, but how much your purchasing power actually changed. In a high-inflation environment the figure in your account can grow while what it can buy shrinks; real return measures exactly that gap. It is also the central idea of this site.

Nominal return versus real return

Nominal return is the percentage change in the investment's own currency: if 100 lira becomes 130 lira, the nominal return is 30%. But that does not tell you how much of the 30 lira is a genuine gain and how much is merely the general rise in prices.

What gives a return figure meaning is comparing it with the inflation rate of the same period. Nominal return answers "how much did the number in my pocket grow"; real return answers "can that number still buy as much as before." For a saver, the second question is the one that matters.

How to calculate real return: the Fisher formula

The correct method is to divide the nominal return by inflation, not subtract it:

Real return = (1 + nominal return) ÷ (1 + inflation) − 1

This is called the Fisher equation. Example: nominal return 30%, inflation 25%. The shortcut (30 − 25 = 5%) gives the wrong answer. The correct one:

(1.30 ÷ 1.25) − 1 = 1.04 − 1 = 4%.

Why dividing beats subtracting

Because return and inflation act on each other at the same time, in a compounding way. The money you earn is itself spent at now-higher prices. When the rates are small, subtraction and division give similar results; but in a high-inflation environment like Turkey the gap widens sharply, and subtraction systematically overstates the real return.

Positive nominal return, negative real return

A fund's return can carry a plus sign and still be losing you money. When inflation exceeds the nominal return, the formula's result is negative. This is not a mathematical detail; it means you can no longer buy the basket of goods you bought a year ago with the same money.

For instance, nominal return 20%, inflation 30%:

(1.20 ÷ 1.30) − 1 ≈ −7.7%.

The number in the account looks bigger, yet your purchasing power has fallen. That is the answer to the most searched question about real return — "why is it negative": because the nominal gain failed to keep up with inflation.

Which inflation? CPI, ENAG, USD

There is no single "correct" real-return number; it depends on which inflation base you choose. Each gauge answers a different question:

• CPI (TÜFE) — TÜİK's official consumer price index. This is the legal and institutional reference.
• ENAG — an alternative index computed from online data by the Inflation Research Group, an independent body of academics; it typically comes out higher than TÜİK's.
• USD conversion — converting the return into dollars. It answers "did my investment gain value against hard currency"; it is a currency measure, not a consumption basket.

The same fund can look real-positive against CPI and real-negative against ENAG. That is not a contradiction but two different answers to two different questions. Transparency starts with stating clearly which base you used.

See the real return yourself

To view a fund's past nominal and real returns side by side, you can compare TEFAS funds under different inflation gauges. To see step by step how a given amount would have changed in a fund between two dates, in both nominal and real terms, use the calculator on the /fon-getiri-hesaplama page. These pages give no recommendation; they simply show the figure adjusted for inflation and leave the interpretation to you.