International Allocation Calculator
Enter your US and international equity holdings to see your geographic allocation, home bias score vs. global market weights, and how different mixes have performed historically.
| Mix | Est. Ann. Return | Volatility | Notes |
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Historical return estimates based on 1990–2024 data. Past performance does not guarantee future results.
US vs. International Allocation
The US represents approximately 60% of global equity market capitalization, yet the average US investor holds over 80%–85% of their equity portfolio in US stocks. This overweight in domestic equities relative to global market weights is called home bias, and it creates concentrated exposure to a single country's economic cycle, regulatory environment, currency, and valuation levels.
Why International Diversification Matters
The primary case for international exposure is not correlation reduction — US and international developed market correlations have risen over the past 30 years as global markets integrated. The case is:
- Valuation exposure: When US stocks are expensive by historical measures (high P/E ratios), international markets may offer better forward return expectations. Over 10-year periods, starting valuation is the strongest predictor of returns.
- Currency diversification: A globally diversified portfolio holds multiple currencies, which can provide a hedge when the US dollar declines.
- Economic cycle exposure: Different countries experience different phases of economic expansion and contraction. Emerging markets often grow fastest when developed markets are slowing.
- Sectors not well-represented in the US: Global consumer staples, European financials, and Asian manufacturing are significant portions of world GDP with no equivalent US proxy.
Developed vs. Emerging Markets
International allocation splits into two broad categories with different risk-return profiles. Developed markets (MSCI EAFE: Europe, Australasia, Far East) offer lower volatility and more established regulatory frameworks, with expected returns roughly in line with the US over long periods but different interim performance patterns. Emerging markets (MSCI EM: China, India, Brazil, Taiwan, South Korea) offer higher growth potential but also higher volatility, political risk, currency risk, and liquidity constraints.
A typical split within international exposure is 70%–80% developed / 20%–30% emerging markets. Vanguard's Total International Stock ETF (VXUS) and Fidelity's FTIHX use approximately this split.
Geographic diversification works together with sector diversification to build a portfolio resilient to multiple types of concentration risk. The portfolio diversification guide covers how to combine sector balance and geographic exposure in a single, coherent strategy. If you're deploying new money globally, the windfall investment calculator shows the tax-efficient order for building international positions across account types.
Frequently Asked Questions
How much of my portfolio should be international?
Global market cap weight is approximately 40% international. Most US financial advisors suggest 20%–40% international equity exposure. Vanguard's target-date funds use ~40%. A practical starting point for US investors is 20%–30% international — enough to meaningfully reduce home bias without requiring complex multi-fund management. Going below 10% international provides minimal diversification benefit.
What is home bias and why does it matter?
Home bias is holding more domestic equities than global market weights suggest. US investors with 90%+ US stocks are overweight US by roughly 30 percentage points relative to the 60% global market weight. This creates concentration in one country's economic cycle, currency, and valuation — similar to sector concentration risk but at the country level. During periods when the US underperforms (2000–2009, various EM outperformance cycles), home-biased portfolios lag significantly.
What are the best international funds to use?
For developed international: Vanguard FTSE Developed Markets ETF (VEA), iShares Core MSCI EAFE ETF (IEFA), or Fidelity International Index Fund (FSPSX). For emerging markets: Vanguard FTSE Emerging Markets ETF (VWO) or iShares Core MSCI Emerging Markets ETF (IEMG). For simple total international exposure in one fund: Vanguard Total International Stock ETF (VXUS) covers both developed and emerging markets at global market cap weights.
Does currency hedging make sense for international exposure?
Currency hedging eliminates foreign exchange volatility but adds cost (approximately 0.3%–0.8% annually). For long-term investors, unhedged exposure is generally preferred — currency moves tend to mean-revert over long periods, and the additional cost of hedging erodes returns. Hedged funds (like HEFA for hedged EAFE) make more sense for short-term holdings or when you have specific views on dollar strength.
Has international diversification actually helped US investors?
Results are mixed by period. The 2000s "lost decade" for US stocks showed international exposure was crucial — MSCI EAFE returned positive while the S&P 500 returned near zero over 2000–2009. The 2010–2021 period reversed this, with US dramatically outperforming. The argument for international isn't that it always outperforms — it's that you don't know in advance which decade favors which market, and diversification protects you from being fully wrong either way.