The day this lesson was written, the world population was 6,672,678,672. the population of the united states was 304,276,585. what is the population on the day you read this? put “world population clock” into your search engine and see for yourself. ps: i've already done it, the population as of 13 of september is 7,532,064,512 write down the current date and the current world population. use a calculator to figure out what percentage it has increased since the day this lesson was written. use this formula: (current population - former population) / former population) x 100.