Constant-Currency Growth: Why It Differs from Reported Revenue Growth
Constant-currency growth removes changes in translation exchange rates. Understand its calculation, its difference from reported growth, and the currency effects that remain in cash flow.
Constant-currency growth compares two periods' results translated using the same exchange-rate basis. It helps assess trends in overseas operations, but it neither replaces actual reported revenue nor eliminates currency risk.
Find out which period's exchange rates are held constant
Both translating this year's results at last year's exchange rates and retranslating last year's results at this year's rates can be used for comparison. With multiple currencies and differing regional growth rates, the results can differ. The SEC's non-GAAP guidance addresses explanations of how constant-currency information is calculated and presented. Rather than assuming figures are equivalent based on a table heading, check the footnotes for the rates used, the comparison base, and the adjustment method.
Translation effects and transaction effects are different
A translation effect is the difference arising when an overseas subsidiary's local revenue is converted into Korean won. By contrast, paying for raw materials in dollars or paying interest on foreign-currency debt affects operating cash flow. Even with strong constant-currency revenue growth, higher import costs can reduce margins. Do not use a revenue-only constant-currency presentation to judge the currency sensitivity of net income or cash. Check cost currencies and hedging contracts separately.
Break local growth down again into price and volume
Removing currency effects does not make all remaining growth an increase in sales volume. Local price increases, product mix, and acquisitions may still be included. Microsoft's annual report provides currency-related comparative information alongside business-level explanations. Use constant-currency figures as a starting point for reading operating commentary, then check whether actual customer numbers or usage increased. Price increases in high-inflation regions need to be distinguished from stronger demand.
In practice, you can record the difference between reported and constant-currency growth as a currency contribution in percentage points. However, where multiple adjustments and rounding are involved, the gap may not exactly match the company's detailed calculation of the currency effect. If the difference is large, first check display units and rounding, and do not arbitrarily assign an unexplained residual to demand.
Worked example
Hypothetical example: Overseas revenue of USD 1 million last year and USD 1.1 million this year represents local-currency growth of 10%. If the translation rate falls from KRW 1,200 to KRW 1,100 per dollar, reported revenue rises from KRW 1.2 billion to KRW 1.21 billion, or about 0.83%. Translating this year's revenue at last year's rate gives KRW 1.32 billion and growth of 10%. The two figures answer different questions rather than contradict each other.
What to check
- Have you checked the reference exchange rates and translation direction?
- Have you retained reported growth alongside the adjusted figure?
- Do pricing, volume, or acquisition effects remain?
- Have you distinguished revenue translation from transaction exchange rates affecting costs?
Sources and primary materials
This is educational material about research methods. For an actual company decision, verify the filings and primary sources for the relevant period.