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Big Mac Index Calculator
Big Mac Index Calculator
EUR Valuation vs the Dollar
+3.5%
Currency Analysis
The EUR is within ±5% of its Big Mac parity — effectively fairly valued against the dollar. The local price converts to $6.22, close to the $6.01 US price. For a US investor, currency risk on EUR-denominated assets is roughly neutral by this yardstick.
*The Big Mac Index is a lighthearted economic yardstick, not a forecasting tool. Exchange rates can stay out of line with purchasing power for years. This tool is educational and is not investment advice.
What Is the Big Mac Index?
The Big Mac Index is an informal measure of currency valuation invented by The Economist magazine in 1986. It rests on purchasing power parity: the idea that identical goods should eventually cost the same in different countries once exchange rates are accounted for. A Big Mac is nearly identical everywhere it is sold, so comparing its local price to the US price implies what the exchange rate 'should' be. If a burger costs 25% more abroad than in America, the foreign currency looks 25% overvalued on this yardstick. For Australian investors the index is more than a novelty because so much of our wealth is exposed to overseas currencies. Every dollar you hold in international share funds, US-listed stocks, or foreign cash is affected by the AUD's value. A deeply undervalued Aussie dollar boosts the local-currency value of those foreign assets; an overvalued one drags it down. The index is best treated as a long-term compass rather than a trading signal, since a sandwich cannot arbitrage away wage gaps, rents, or capital controls, and currencies can stay out of line with purchasing power for a very long time.
From Burger Price to Currency Valuation
The calculation starts with an implied exchange rate. Implied PPP = Local Big Mac Price ÷ US Big Mac Price, expressed as units of local currency per US dollar. If a Big Mac costs 7.70 in Australia and US$6.01 in the US, the burger-implied rate is roughly 1.28 Australian dollars per US dollar. Valuation then compares that implied rate with the actual market rate: Overvaluation % = (Implied PPP ÷ Market Rate − 1) × 100. If the market trades at 1.50 AUD per US dollar while burgers imply 1.28, the Aussie dollar is about 15% undervalued — each US dollar buys more local currency than purchasing power suggests. The calculator also converts the local price into US dollars at the market rate, showing what an American would pay for the burger here. One caveat the formula highlights: countries with very low wages and cheap real estate will almost always show undervalued currencies, while high-income economies like Switzerland show persistent overvaluation. Structural cost differences, not mispricing, drive much of the gap, so treat results wider than ±10% with healthy scepticism.
Expert Insights
Use It to Sense-Check International Exposure, Not to Trade
The Big Mac Index is not a timing tool, but it is an excellent context check for how much currency risk you are carrying. If the Aussie dollar looks heavily undervalued on this measure, the foreign-currency tailwind on your unhedged international holdings is already working in your favour and may persist.
Hedging Decisions Rest on This Kind of Valuation
When building an international portfolio, Australians must decide whether to hedge currency risk. A currency trading well below its PPP-implied value is arguably a poor candidate to hedge, since you would pay to give up the potential upside of a long-term reversion.
Remember It Measures One Tradable Good
A burger is local: it bakes in wages, rents and services costs that do not flow across borders. That is why fast developing economies often look 'undervalued'. The index is a useful first cut, but it must be paired with real drivers such as interest rate differentials, terms of trade and capital flows before it earns weight in a decision.
Actionable Tips
- 1
Refresh the Price Data Twice a Year
The Economist publishes its Big Mac Index around January and July. Use the latest local and US prices from those editions (or your own observation) so the inputs reflect current reality rather than stale figures, and re-run the comparison to see whether the valuation story has shifted.
- 2
Compare the Verdict With Your Currency Exposure
If the tool flags the Aussie dollar as deeply undervalued, check how much unhedged international exposure you hold and whether that position is a deliberate bet on the AUD staying weak. The index helps you see the trade you already own, whether you chose it or not.
- 3
Pair It With a Real Exchange-Rate Check
Set an alert on your broker or the RBA's statistical tables for the AUD/USD rate used here. When the market rate moves meaningfully, the overvaluation figure moves with it, and the decision to convert, hedge or hold should be revisited at that point.
Real-World Examples
Tom Realised His US Fund Had a Hidden Currency Bet
Tom, a Sydney investor, held a globally diversified fund denominated in US dollars. The Big Mac Index showed the AUD about 12% undervalued, which meant his foreign assets had extra local-currency value baked in that could fade if the Aussie dollar recovered. The insight prompted him to keep some unhedged exposure deliberately rather than by accident.
Priya Used It to Decide When to Convert for a Trip
Planning an overseas holiday, Priya noticed the Aussie dollar sat near the undervalued end of its Big Mac range. She spread her conversions across several months instead of converting everything at once, reducing the sting of a weak currency on her travel budget.
Marcus Questioned an Expensive Overseas Asset
Marcus was tempted to pile more money into a US-listed tech ETF. The index flagged his home currency as cheap relative to the US, reminding him that part of his returns so far had been a currency tailwind. He sized the position for fundamentals rather than assuming both the stock and the exchange rate would keep running.
Glossary of Terms
- Purchasing Power Parity (PPP)
- The theory that exchange rates between two currencies should equalise the price of an identical basket of goods in each country.
- Overvaluation / Undervaluation
- Whether a currency trades above or below the exchange rate implied by purchasing power, expressed as a percentage.
- Currency Hedging
- Using financial instruments to offset the effect of exchange-rate movements on a foreign investment, locking in the domestic value.
Frequently Asked Questions
Everything you need to know about this topic.
Ivy Sinclair-Wren
Financial Chaos Analyst
Ivy Sinclair-Wren is a Financial Chaos Analyst covering investing, AI, wealth psychology, and the emotional consequences of opening finance apps during market crashes. Based in Melbourne, she specializes in demystifying the Australian tax code and helping users navigate the intersection of spreadsheet logic and human irrationality.