Convert Gigabyte to Terabyte (GB → TB)

Converting gigabytes to terabytes is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.

1. 1
   Take your value in gigabytes

   Start with the number of gigabytes (GB) you want to convert.
2. 2
   Multiply by 0.001

   The conversion factor from GB to TB is 0.001. Multiply your value by this number.
3. 3
   Read the result in terabytes

   The result is your value in terabytes (TB).

Multiply the value in gigabytes by 0.001. For the reverse direction, multiply by 1,000.

• ✓SI: 1 GB = 1000 MB = 10⁹ B. Binary GiB = 2³⁰ B.
• ✓Hard drives use SI; OS may show binary — discrepancy ~7%.
• ✓Mobile data plans: SI GB.

• ✗Expecting 64 GB drive to hold 64 × 1,073,741,824 B — it's 64 × 10⁹ B (7% less by binary measure).
• ✗Confusing GB with Gb (gigabit, 1/8).
• ✗Mixing GB and GiB without noting the discrepancy.

What is the Gigabyte?

The gigabyte (GB) equals 1,000 megabytes (1,000,000,000 bytes decimal, or 1,073,741,824 bytes as GiB binary) and is the standard unit for smartphone storage, mobile data plans, and modern application sizes. Modern smartphones offer 64–1,024 GB of storage, mobile data plans range from 1 to 50+ GB per month, and operating-system installations typically require 20–80 GB. A 4K video stream consumes 6–8 GB per hour, and a typical app download is 50–500 MB to a few GB. The famous discrepancy between manufacturer-advertised capacity (GB decimal) and operating-system-displayed capacity (GiB binary) means a '1 TB' drive shows about 931 GB to the user. The gigabyte relates to the megabyte (1,000 MB = 1 GB), the terabyte (1,000 GB = 1 TB), the gibibyte (1 GiB = 1.074 GB), and the gigabit (1 GB = 8 Gbit).

• Phone and device storage
• Mobile-data plan allowances
• Memory (RAM) sizes

What is the Terabyte?

The terabyte (TB) equals 1,000 gigabytes (10¹² bytes decimal, or 1,099,511,627,776 bytes as TiB binary) and is the standard unit for hard drives, video archives, and consumer cloud-storage subscriptions. Modern hard drives ship in 1–20 TB capacities, SSD drives commonly come in 0.5–8 TB sizes, and cloud-storage tiers offer 1, 2, or unlimited TB plans. Professional video editors store raw footage in tens of TB. The terabyte relates to the gigabyte (1,000 GB = 1 TB), the petabyte (1,000 TB = 1 PB), and the terabit (1 TB = 8 Tbit). Streaming services like Netflix process petabytes of bandwidth per day. The first 1-TB hard drive shipped in 2007 (Hitachi Deskstar 7K1000); today, 8-TB consumer drives cost less than $200.

• Desktop HDDs and SSDs
• Home NAS storage
• Cloud-storage tiers