How many grains of sand are there on the earth?

The question is — and I bet you asked it when you were 8 years old and sitting on a beach: Which are there more of — grains of sand on the Earth or stars in the ... read more

They said, if you assume a grain of sand has an average size and you calculate how many grains are in a teaspoon and then multiply by all the beaches and deserts in the world, the Earth has roughly (and we're speaking very roughly here) 7.5 x 10 18 grains of sand, or seven quintillion, five hundred quadrillion grains. read more

But more likely, there are 5 to 10 times more stars than there are grains of sand on all the world’s beaches. So, there’s your answer, Sheldon. For some “back of the napkin” math we can guess that there are more stars in our Universe than there are grains of sand on all the beaches of Earth. read more

According to Cain's associate, 'The Math Dude', there are approximately 700 trillion cubic meters of beach on our planet. These 700 trillion cubic meters could therefore hold approximately 5 sextillion grains of sand, which means that Carl Sagan was, of course, correct. read more