Gigabytes to Terabytes Converter

1 terabyte equals 1,000 gigabytes under the decimal (SI) convention this converter uses — the same standard drive manufacturers, AWS, Google Cloud, and Dropbox use to label and bill storage. To convert GB to TB, divide by 1,000; for example, 500 GB = 0.5 TB and 4,000 GB = 4 TB.

Manufacturers label capacity using decimal math (1 TB = 1,000 GB = 10^12 bytes), but Windows File Explorer calculates free space using binary math, where what it labels 'GB' is actually a gibibyte (2^30 bytes). The same physical bytes divided by a larger binary unit produce a smaller displayed number — roughly 931 instead of 1,000. No storage is missing; it's a units mismatch.

This converter uses the decimal (SI) standard — divide GB by 1,000 to get TB. That matches drive packaging, cloud storage invoices, and network transfer specs. If you're reconciling against an operating system that reports binary gibibytes/tebibytes (divisor 1,024), expect the OS figure to read roughly 7% lower than the decimal value at the terabyte scale.

A 2,000 GB external hard drive is 2 TB. A cloud plan advertising 8,000 GB of pooled storage across a team is 8 TB. A 10,000 GB enterprise NAS array is 10 TB — the largest reference value in this converter's table, roughly the size of a small business's entire multi-year backup archive.

Because the divisor is 1,000, converting whole hundreds and thousands of GB produces clean results — 250 GB is exactly 0.25 TB, 750 GB is exactly 0.75 TB — so it's tempting to assume all GB-to-TB conversions round evenly. They don't. A value like 137 GB converts to 0.137000 TB, and if you're summing many such conversions (say, itemizing folder sizes before totaling storage needs), truncating too early compounds error. For billing or capacity-planning purposes, keep at least three decimal places through TB until the final total, then round once at the end rather than rounding each line item.

GB and TB (as used here) are decimal units: 1 GB = 10^9 bytes, 1 TB = 10^12 bytes, and the conversion factor between them is a clean 1,000. GiB and TiB are binary units: 1 GiB = 2^30 bytes, 1 TiB = 2^40 bytes, with a conversion factor of 1,024. The two systems diverge more as numbers grow — a 10 TB drive is about 9.09 TiB. Software that labels binary units as 'GB'/'TB' (common in Windows and some firmware) is technically misusing SI notation, which is exactly why the IEC introduced gibi-/tebi- prefixes in 1998.

A common professional photography backup of 50,000 RAW images at roughly 30-50 MB each lands around 1,500-2,500 GB, or 1.5-2.5 TB. A feature-length project shot in 4K ProRes can generate 4,000-8,000 GB (4-8 TB) of raw footage before editing. On the consumer side, a family's phone photo and video backup across several devices typically totals 250-750 GB (0.25-0.75 TB), which is why most consumer cloud tiers top out well under 1 TB while professional and business tiers are priced and marketed in TB increments.

The byte-multiple prefixes follow the metric system's kilo-/mega-/giga-/tera- scale, but their computing usage lagged real-world capacity for decades. 'Gigabyte' entered common tech vocabulary in the 1980s as hard drives crossed the 1,000 MB threshold; 'terabyte' remained largely a data-center and supercomputing term through the 1990s, since consumer drives didn't reach 1 TB until 2007 (the first 1 TB hard drives shipped from Hitachi and Seagate that year). Consumer SSDs commonly available in multi-TB capacities is a 2015-onward phenomenon, which is part of why GB-to-TB conversions are now a routine consumer task rather than a specialist one.

Once a figure exceeds a few thousand GB, quoting it in TB keeps numbers legible — '5 TB' reads faster than '5,000 GB' and avoids implying false precision. Cloud providers like AWS S3, Google Cloud Storage, and Backblaze typically price per-GB but report account totals and transfer caps in TB once usage scales past the low thousands of GB. ISPs offering monthly data caps (e.g., 1.2 TB) do the same for home broadband. This converter's reference table spans exactly that transition zone, from 1 GB up to 10,000 GB (10 TB), covering both the per-file scale and the account-total scale in one place.