1 terabyte is either:

  • 1,000 gigabytes (decimal, what drive and cloud vendors usually mean)
  • 1,024 gigabytes (binary, what many operating systems and IT folks effectively use)

So when you see “how many GB in a TB,” the everyday answer is 1,000 GB in 1 TB, but your computer may show it closer to 1,024 GB depending on how it measures storage.