Why some places seem more crowded than we think? Because of how population density is calculated. In this article, the Economist presents an alternative method of calculating population density: dividing the urban population by the area taken up by cities. On this measure Bangladesh’s urban areas hold about 75,000 people per square kilometre (194,250 per square mile). This is likely the world’s highest and is over 70 times the figure derived from cruder calculations. Click on the chart to access the article.