The trade openness index measures how dependent a country’s economy is on international trade by adding its total exports and imports, then dividing by its gross domestic product. The result is usually shown as a percentage. It runs from close to zero in isolated economies up past 300 percent in trade hubs like Singapore and Hong Kong. As of 2023, the world average was around 63 percent of global GDP, meaning the combined value of goods and services crossing borders is now larger than half the world’s total economic output.1Our World in Data. Trade and Globalization
How to Calculate It
The formula is simple. Add exports and imports, divide by GDP, multiply by 100.2Our World in Data. Trade as a Share of GDP A country with $500 billion in exports, $600 billion in imports, and a $2 trillion GDP scores 55 percent. Trade flows equal just over half the size of its domestic economy.
The World Bank’s standard version of the indicator (code NE.TRD.GNFS.ZS) counts both goods and services.3The World Bank. Trade (% of GDP) That matters. Finance, insurance, consulting, travel, and transport make up a growing share of what crosses borders, and leaving them out produces a very different number. A narrower version limited to physical goods exists under the label “openness to merchandise trade.”4World Integrated Trade Solution. Openness to Trade
All figures are recorded in a standardized currency, typically U.S. dollars, so countries can be compared. The underlying numbers come from national accounts, customs records, and balance-of-payments reporting.
What the Scores Look Like Around the World
The range is enormous. Based on 2023 data:
- Luxembourg: roughly 399 percent
- Hong Kong: roughly 353 percent
- Singapore: roughly 326 percent
- China: roughly 36 percent
- United States: roughly 25 percent
- Sudan: roughly 2.5 percent
The United States is the world’s largest trading nation measured in dollars, yet it scores low because its enormous domestic economy dwarfs the trade flows in the denominator. China is similar. Luxembourg, by contrast, scores nearly 400 percent because its economy is built around financial services and cross-border commerce that far exceed domestic output.
The global figure stayed under 10 percent for centuries. It only began climbing meaningfully after World War II, as tariff barriers fell and shipping costs dropped, reaching 63 percent by 2022.1Our World in Data. Trade and Globalization The climb hasn’t been smooth. The 2008 financial crisis temporarily pushed some national scores up, not because trade surged but because GDP collapsed faster than trade did.
Why Some Countries Score Above 100 Percent
A score over 100 percent means imports plus exports exceed the entire GDP. That sounds impossible, but it happens routinely in trade hubs. Singapore and Hong Kong have stayed above 250 percent for decades.
Re-exporting is the main reason. A country imports goods, performs little or no processing, and ships them out again. The full value shows up twice in the numerator, once as an import and once as an export, while the activity adds relatively little to GDP because the domestic value added is small. The country functions as a logistics and distribution hub, routing goods between other economies. Port infrastructure, favorable regulations, and strategic geography create the conditions for this kind of throughput.2Our World in Data. Trade as a Share of GDP
What Drives a Country’s Score
Three forces shape the baseline: the size of the domestic economy, geography, and trade policy.
Economic Size
Large economies almost always score lower. The United States, China, Japan, and India have enough internal demand that domestic transactions dominate GDP. A huge share of what Americans produce, Americans buy. Smaller economies lack that self-sufficiency. A country with limited natural resources or a narrow industrial base has no choice but to import heavily and export whatever it specializes in, pushing the score up.
Geography
Countries near major shipping lanes or with deep-water ports tend to score higher because transportation costs are lower. Proximity to wealthy trading partners matters just as much. Sitting next door to the European Union or the United States increases trade volume almost mechanically. Landlocked countries face the opposite problem. Higher transit costs and dependence on neighbors’ infrastructure suppress trade regardless of domestic policy.
Trade Policy
Tariffs, quotas, and regulatory requirements directly control how much crosses the border. High tariffs raise import costs and reduce the numerator. Free trade agreements remove those barriers, and countries that join them generally see scores rise. Customs friction counts too. If clearing a shipment takes days of paperwork, that cost reduces trade volume. The postwar push toward lower tariffs through the General Agreement on Tariffs and Trade and later the World Trade Organization drove much of the global increase in trade openness over the past 75 years.5Dallasfed.org. U.S. Tariff Outcomes Dependent on Trading Partner Responses
Where U.S. Trade Policy Fits In
Because tariffs and trade restrictions change the volume of goods crossing the border, policy decisions show up in the index. Section 301 of the Trade Act of 1974 gives the U.S. Trade Representative authority to impose duties or other import restrictions on countries engaged in unfair trade practices.6Office of the Law Revision Counsel. 19 U.S. Code 2411 – Actions by United States Trade Representative When the USTR imposes Section 301 tariffs, higher costs can reduce import volumes. If trading partners retaliate, exports may fall too. Both effects shrink the numerator and pull the openness score down.
In June 2026, the USTR proposed action in 60 separate Section 301 investigations related to trade in forced-labor goods, finding that the practices of those economies “burden or restrict U.S. commerce.”7United States Trade Representative. USTR Makes Findings and Proposes Action in 60 Section 301 Investigations Relating to Failures to Take Action on Trade in Forced Labor Goods Enforcement priorities like these end up shaping the raw numbers that feed the calculation.
On the compliance side, U.S. importers and exporters submit shipment data through the Automated Commercial Environment, the digital system U.S. Customs and Border Protection uses to process imports and exports and collect tariff revenue.8U.S. Customs and Border Protection. ACE: The Import and Export Processing System Those ACE filings are where much of the raw U.S. trade data originates before it flows into official statistics.
What the Index Doesn’t Tell You
The trade openness index is popular because it’s simple and available for almost every country going back decades. The simplicity hides real blind spots.
- Size bias. Small economies automatically score higher than large ones, even when the large economy trades more in absolute terms. The United States is the biggest trader in the world by dollar volume and still sits around 25 percent, not because it is particularly closed but because its economy is massive. Any ranking built on this index will push big economies to the bottom.
- Cyclical distortion. Because GDP sits in the denominator, a recession can make a country look more open even when trade is falling. During the 2008 financial crisis, several countries looked more open simply because GDP dropped faster than trade did.
- It measures volume, not policy. A country with low tariffs but little trade (because of geography or industrial structure) will score low. A country with high tariffs but massive re-export flows will score high. The index captures outcomes, not the rules behind them. Researchers who want to measure how restrictive policy actually is need different tools.
- GDP differences drive a lot of the variation. Some research has found that much of the cross-country variation in the index comes from differences in GDP rather than differences in trade flows, raising questions about what the number is really telling you.
None of this makes the index useless. It does mean a single number can mislead if you don’t know what’s baked in. Comparing countries of similar size is more informative than comparing Luxembourg to the United States.
What Scores Say About Economic Risk
A high score signals integration with the world economy. It also signals exposure to it. Research across ASEAN member states found that trade openness contributes to greater output volatility, because more trade means more exposure to swings in commodity prices, exchange rates, and foreign demand.9Economic Research Institute for ASEAN and East Asia (ERIA). Trade Openness, COVID-19 Shock, Foreign Direct Investment, Inflation, and Output Volatility in Six ASEAN Member States When your economy depends heavily on selling abroad, a recession in your biggest trading partner hits you directly.
The relationship cuts both ways. The same research noted that trade openness can reduce volatility when it leads to a more diversified production structure. A country that trades widely across many sectors and many partners is less vulnerable than one dependent on a single export commodity. Whether openness brings diversification or concentration is what decides the risk picture. Countries that specialize narrowly in a few exports tend to experience sharper swings as those markets move.
The general academic consensus holds that trade openness tends to promote economic growth, especially in developing countries, though the relationship is context-dependent. Institutional quality, infrastructure, and the composition of trade all affect whether higher openness translates into higher income.
Where to Find the Data
Several international organizations maintain the datasets researchers use to calculate and compare trade openness.
The World Bank publishes one of the most widely used versions through its World Development Indicators database, drawing from national statistical agencies, central banks, and the OECD.3The World Bank. Trade (% of GDP) The dataset covers goods and services for nearly every country and stretches back decades.10World Bank. DataBank
The International Monetary Fund maintains detailed balance-of-payments data, tracking transactions between a country’s residents and the rest of the world.11International Monetary Fund. Balance of Payments (BOP) Researchers who need granular breakdowns of what kinds of trade are flowing often start here.
The World Trade Organization maintains its own trade databases, including the Integrated Database covering imports by commodity and partner country, and the Consolidated Tariff Schedule Database covering bound tariff rates.12World Bank. How Is Trade Data Collected WTO data leans more on the tariff and regulatory side than on the broader macroeconomic picture.
For U.S.-specific numbers, the Bureau of Economic Analysis publishes “International Trade in Goods and Services” as a principal federal economic indicator, covering both goods and services on a monthly basis.13U.S. Bureau of Economic Analysis. Bureau of Economic Analysis BEA also tracks the current-account balance as a share of GDP through its U.S. International Transactions series, giving a more detailed view of the American picture than any single openness score can.