Quintillion bytes to terabytes

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I am trying to convert 2.5 quintillion bytes to terabytes (IBM's estimate on the amount of data produced daily), could someone check if my calculations are correct?

1 Terabyte is 1000 Gigabytes
1 Gigabyte is 1000 Megabytes
1 Megabyte is 1000 Kilobytes
1 Kilobyte is 1000 Bytes

1 Quintillion is $10^{18} $

2.5 Quintillion is $2.5 x 10^{18} $

1 Terabyte is $10^{12}$ bytes

How many terabytes is it then? How do you work this out? Is this correct?

$2.5x10^{18} $ / $10^{12} $ = 2,500,000 Terabytes?

This sounds like an awful lot to me? Does this sound/look correct?

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1 Answer

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Your calculation is correct. There are two different usages of kilo/mega/gigabytes, one with factors of $1000$ and one with factors of $2^{10}=1024$. Since you're dealing with a rather rough estimate, the difference is probably not important.

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