The world's largest economies are generally determined by their nominal GDP (Gross Domestic Product), which is the value of all goods and services produced within a country's borders in a given year, without adjusting for inflation. The rankings of the largest economies can change from year to year, but as of 2021, the top ten largest economies in the world are:
United States - $22.7 trillion
China - $16.8 trillion
Japan - $5.1 trillion
Germany - $4.2 trillion
United Kingdom - $2.9 trillion
India - $2.8 trillion
France - $2.8 trillion
Italy - $2.1 trillion
Brazil - $1.8 trillion
Canada - $1.7 trillion
It's important to note that there are different ways to measure economic size, such as using GDP per capita or adjusted for purchasing power parity (PPP), which can result in different rankings.