Divide gigabytes by 1000 (decimal) or 1024 (binary)
Terabyte to gigabyte is a clean factor of 1000 under SI decimal: 1 TB equals 10¹² bytes, 1 GB equals 10⁹ bytes, the ratio is 10³. The binary equivalents are tebibyte (TiB, 2⁴⁰ bytes) and gibibyte (GiB, 2³⁰ bytes), also at ratio 1024. ConvertBuddy uses the decimal convention to match storage product labels and cloud billing. The 2.4% gap between 1000 and 1024 grows visible at terabyte scale: a '1 TB' drive shows roughly 931 'GB' free in Windows due to the unit-label mismatch.
The terabyte sits one step above the gigabyte in the storage hierarchy. One terabyte equals 1,000 gigabytes under the decimal SI convention used by hard drive manufacturers, NAS vendors, and cloud-storage providers.
Convert from GB to TB when planning multi-drive backup arrays, sizing cloud-archive tiers, or comparing total media library size against drive options. The binary alternative (1 TiB = 1024 GiB) shows up in some operating system tools, but rarely on price tags or mobile-plan invoices.
As consumer storage scaled past one terabyte in the late 2000s, the unit became routine on external drives, server arrays, and high-capacity SSDs.
A 20,000-photo iPhone library at 3 MB each plus 200 video clips at 200 MB each runs about 100 GB — comfortably inside a single 1 TB drive but worth converting when deciding between 1 TB and 2 TB tiers.
Pro cameras shoot 50-150 MB RAW files. A 30-shoot year fills 100-300 GB. Convert to GB when comparing whether a 1 TB or 2 TB external drive serves you for several years.
Drives sold by TB capacity; usable space after RAID and filesystem overhead given in GB by the NAS UI. Convert to verify expected usable capacity matches the marketing-label TB total.
Backblaze, Backblaze B2, and similar services price storage in dollars per TB-month. Per-file or per-folder volumes given in GB. Convert to estimate the monthly bill before committing.
Database row counts and average row sizes give projection in MB or GB. Disk allocations come in TB increments on cloud providers. Convert to map projected growth onto disk-tier upgrade timing.
1 TB = 1,000 GB (decimal) or 1,024 GB (binary).