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Big Mac Index Calculator
Big Mac Index Calculator
EUR Valuation vs the Dollar
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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. The index has become a beloved first cut at exchange-rate analysis because it is simple, global, and updated twice a year. It has correctly flagged currencies like the Japanese yen, which has repeatedly appeared deeply undervalued against the dollar, and the Swiss franc, which perennially looks expensive. For US investors, the signal matters beyond burgers: a deeply undervalued currency boosts the dollar returns on foreign stocks held, while an overvalued one adds depreciation risk. Of course, a sandwich cannot arbitrage away wage gaps, rent, or capital controls, so the index is best used as a long-term compass rather than a trading signal.
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 480 yen in Tokyo and $6.01 in Chicago, the burger-implied rate is roughly 80 yen per dollar. Valuation then compares that implied rate with the actual market rate: Overvaluation % = (Implied PPP ÷ Market Rate − 1) × 100. If the market trades at 150 yen per dollar while burgers imply 80, the yen is about 47% undervalued — each dollar buys nearly twice as many yen as purchasing power suggests. The calculator also converts the local price into dollars at the market rate, showing what an American would actually pay for the burger abroad. 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 and Norway show persistent overvaluation. Structural cost differences, not mispricing, drive much of the gap, so treat results wider than ±10% with healthy skepticism.
Expert Insights
Use It for Direction, Not Timing
Purchasing power parity is a mean-reversion story measured in years, not weeks. The yen looked undervalued for a decade before the 2024 carry-trade unwind. Use the index to gauge whether currency risk is a tailwind or headwind for a multi-year international holding, never as a short-term trade trigger.
Overvaluation Reflects Real Wage Gaps
The Balassa-Samuelson effect explains why rich countries' currencies look overvalued on a burger basis: local services, wages, and rents are high because productivity is high. Switzerland's expensive Big Mac is a feature of a wealthy economy, not necessarily a currency bubble about to burst.
Currency ETFs Embed the Same Question
When you buy an unhedged international fund, you own the foreign currency too. A deeply undervalued currency offers potential extra dollar returns when it reverts; a hugely overvalued one adds depreciation risk. Check the Big Mac parity before deciding between hedged and unhedged share classes of the same fund.
Actionable Tips
- 1
Refresh Prices Every Six Months
The Economist publishes Big Mac prices each January and July. Local inflation can swing a currency's parity by 10% or more between updates, especially in high-inflation economies like Argentina and Turkey. Re-run this calculator with fresh prices before making any allocation call.
- 2
Compare Against the Country's Own History
A currency 20% below burger parity may still be normal for that market. Track whether today's gap is wider or narrower than its five-year range — a currency at the extreme of its own history is a far stronger signal than one merely looking cheap versus the US.
- 3
Mind the Convertibility Trap
Deeply undervalued currencies often belong to economies with capital controls, political risk, or chronic inflation that prevent parity from ever being reached. An attractive Big Mac number in a restricted market may never translate into realizable dollar returns.
Real-World Examples
Elena Weighed Hedging Her Japan Fund
Elena held a Japanese equity fund and noticed the yen showing roughly 45% undervalued on this index for several years running. She chose the unhedged share class, betting reversion would boost dollar returns. When the yen strengthened sharply in 2024, the currency swing added several percentage points to her return on top of the stock gains.
Tom Avoided the Swiss Franc Yield Trap
Tom was tempted by Swiss bond funds for their stability, but the Big Mac calc kept flagging the franc at a 40%+ premium to the dollar. He concluded that currency depreciation could eat the modest bond yield, and instead used a currency-hedged share class, which protected his returns when the franc pulled back the following year.
Dana Learned the Index's Limit
Dana shorted a Latin currency that screened as massively overvalued on burger parity, expecting a snap reversion. Instead, capital controls widened the gap for two more years and carry costs drained her account. She now uses the index only as a long-horizon valuation lens and never as the basis for a leveraged currency bet.
Glossary of Terms
- Purchasing Power Parity (PPP)
- The theory that exchange rates should equalize the price of an identical basket of goods across countries.
- Overvaluation
- When a currency trades at a higher rate than its purchasing-power measure implies, making foreign goods relatively expensive.
- Currency Hedging
- Using financial instruments to offset the impact of exchange-rate moves on a foreign investment.
Frequently Asked Questions
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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 US tax code and helping users navigate the intersection of spreadsheet logic and human irrationality.