Constant Currency Mechanism

 

One of the most widely used tools in financial analysis today, especially for global companies, is the constant currency approach. In the current economic environment—where exchange rates fluctuate frequently due to inflation differences, interest rate movements, geopolitical tensions, and global capital flows—this concept has become even more relevant.

Let us understand this concept properly and in a practical way.

Problem: If a company has significant share of its revenue and expenses from foreign currency, how to determine its actual % change YoY or any period?

Solution: Use constant currency mechanism

What is constant currency?

A method where conversion rate of a foreign currency is made constant.

Let us understand this by an

example!

Year 1: S company earned €10,000 revenue. The average conversion rate for the year was ₹/€ 80.

Now, Year 2: S company earned the same €10,000 revenue, but the conversion rate for year was ₹/€ 84.

Now, Revenue (in INR) = 840,000 [ €10000*₹84].

If we compare Year 1 vs Year 2 in absolute terms;

Revenue growth= +5% YoY. (10000*(84-80)*100//800000)

But, the revenue growth achieved is the function of entity's operational efficiency? Definitely not!

It is because of currency fluctuations!

To resolve this problem, most of the analysts and company executives use constant currency approach.
Considering the above example, if we use constant currency approach, the result will be as under:

Year 1- Revenue= ₹8,00,000.

Year 2- Revenue= ₹8,00,000. [ €10,000* ₹80]

Wonder how? In year 2 we use year 1 conversion rate to determine the actual growth of revenue over year 1.

If we notice, using constant currency approach mitigates the effect of forex fluctuations, thereby facilitating effective comparison period over period.

Usually, constant currency approach figures are not available in the financial statements of the entity!

They are usually available in:

1. Management commentary

2. Concalls

3. Investor presentations

4. Press releases etc.

This mechanism is highly evident in IT industry as the significant portion of their revenue is sourced from foreign countries!

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Let’s learn more about constant currency

If you regularly follow company results, especially of IT or multinational companies, you must have noticed one line that appears almost every quarter:

“Revenue grew 14% year-on-year. In constant currency terms, growth was 9%.”

At first glance, this sounds technical. But in reality, it solves a very practical problem in financial analysis.

In today’s world, businesses don’t operate within one country. An Indian company may earn in dollars. A European company may sell in Asia. A US company may manufacture in Vietnam and sell in India. Because of this, exchange rates constantly affect financial numbers.

And here is the problem — sometimes growth in revenue has nothing to do with better business performance. It may simply be because the currency moved.

Let’s understand this calmly and logically.

Imagine a company earns €10,000 in Year 1. The exchange rate that year is ₹80 per euro. So when the company converts its earnings into Indian rupees, it reports ₹8,00,000.

Now comes Year 2. The company again earns €10,000. Nothing changed in terms of sales. But this time the exchange rate is ₹84 per euro. So the revenue becomes ₹8,40,000.

If someone just looks at the rupee numbers, they will say — “Wow, revenue grew by 5%!”

But did the business actually grow?

No.

The company sold exactly the same amount. The only thing that changed was the exchange rate.

This is where constant currency comes into the picture.

Constant currency simply means removing the effect of exchange rate changes to understand real operational performance.

In our example, if we use the Year 1 exchange rate of ₹80 to calculate Year 2 revenue, the number remains ₹8,00,000. Now we see the truth — there is zero growth.

This approach gives clarity. It separates operational growth from currency impact.

And this is extremely important in the current economic environment.

Over the past few years, exchange rates have been highly unstable. Central banks have been increasing interest rates. Inflation has been different in every country. The US Dollar has strengthened and weakened at different times. Emerging market currencies have seen sharp movements.

Because of this, companies with foreign exposure can show fluctuating revenue numbers even if their business performance is stable.

If analysts ignore currency impact, they may misjudge a company’s performance.

Now let’s look at the opposite situation.

Suppose in Year 1 the company earns €10,000 at ₹80 = ₹8,00,000.

In Year 2, the company actually improves and earns €11,000. That’s real growth of 10%. But the exchange rate falls to ₹75.

Now revenue in rupees becomes ₹8,25,000.

When compared to ₹8,00,000, growth appears to be only around 3%.

Here the business performed well, but currency reduced the reported growth.

Without constant currency analysis, investors might wrongly assume weak performance.

So constant currency works in both directions:

·        It prevents overestimation of growth when currency is favourable.

·        It prevents underestimation when currency is unfavourable.

This is why it is widely used, especially in industries like IT, pharmaceuticals, and global consumer businesses.

Indian IT companies, for example, earn a large portion of revenue from the US and Europe. When the rupee weakens, their reported revenue automatically increases. That doesn’t always mean demand increased. Sometimes it is just currency support.

That is why management teams always highlight constant currency growth in earnings calls and investor presentations.

It helps investors understand the real momentum of the business.

However, one must also understand that constant currency is only an analytical adjustment. It does not change the actual cash flows of the company.

If the rupee weakens, the company really does receive more rupees when converting dollars. That is real money. But for performance comparison purposes, analysts want to know whether the increase happened because of business improvement or currency movement.

There are also some limitations. Constant currency numbers are usually not audited. They are presented by management. Different companies may use slightly different base exchange rates. So while useful, they should not be viewed in isolation.

In today’s global economy, currency volatility is not temporary — it is a permanent feature. With geopolitical tensions, shifting trade policies, and interest rate cycles, exchange rates will continue to move unpredictably.

That makes constant currency analysis even more relevant today than it was a decade ago.

Whenever you evaluate a company with international exposure, do not just look at reported revenue growth. Always ask:

How much of this growth is real business growth?

How much is because of currency?

If reported growth is 15% but constant currency growth is 8%, then 7% came from exchange rate movement.

If reported growth is 5% but constant currency growth is 12%, then currency worked against the company.

This simple adjustment helps you see through the noise.

Finance is not just about reading numbers. It is about understanding what is driving those numbers.

Constant currency helps remove one major distortion — exchange rate fluctuation — so that we can focus on the real story of the business.

And in today’s interconnected world, that clarity is not optional. It is essential.

If you want to analyse companies properly, especially exporters or multinational firms, always keep this tool in your analytical toolkit. It may look like a small adjustment, but it makes a big difference in understanding reality.

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