Current world population divided by 365 days in a year.
As of 22:36 27/9/13 it is about 7,148,230,000
7,148,230 / 365 = 19,584,200
To work it out accurataly, visit 7billionandme.org, it shows an accurate estimate of the current world population.
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If there are 300,000,000 people in the US, then on average you share your birthday with over 82,000 people. Of course, if your birthday is 2/29, you would share it with about 1/4th of that number.
The answer is 9 000 000 people
EVERYBODY in the US has the same birthday as someone else in the US. The converse would be that someone in the US has his/her own birthday and nobody else in the entire population of 300,000,000 people in the US was born on that day.
For the chance to be at least 50% that two people share the same birthday, there needs to be 22 people. For the chance to be exactly 100% that two people share the same birthday, there needs to be 366 people. If there was 365 people, there would be a very small chance that each person in the room would have different birthdays. With 366 people, there are not enough individual days for every person to have a different birthday, so there has to be at least one pair.
It must be about 360,000 - the approximate number of world births per dayit is estematet to be that 150 million or billion(i cant remember) people share your birthday