GB to TB
Convert gigabytes to terabytes. Divide by 1000, with drive capacities and what a terabyte actually holds.
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The formula
TB = GB ÷ 1000In SI units a terabyte is a thousand gigabytes. Storage manufacturers use exactly this definition, so it is the right one for anything to do with drive capacity.
If a source means binary units, the divisor is 1024 — and at this scale the two answers differ by 2.4%, on top of the 7.4% already baked into calling 2³⁰ bytes a gigabyte. See GB to GiB.
Quick reference
| GB | TB |
|---|---|
| 100 GB | 0.1 TB |
| 250 GB | 0.25 TB |
| 500 GB | 0.5 TB |
| 1000 GB | 1 TB |
| 1024 GB | 1.024 TB |
| 2000 GB | 2 TB |
| 8000 GB | 8 TB |
Drive capacities
| Advertised | Gigabytes | Windows reports |
|---|---|---|
| 500 GB | 500 GB | 465 GB |
| 1 TB | 1000 GB | 931 GB |
| 2 TB | 2000 GB | 1.81 TB |
| 4 TB | 4000 GB | 3.63 TB |
| 8 TB | 8000 GB | 7.27 TB |
| 16 TB | 16,000 GB | 14.55 TB |
What a terabyte holds
| Approximate count in 1 TB | |
|---|---|
| Phone photos at 4 MB | 250,000 |
| RAW photos at 30 MB | 33,000 |
| MP3s at 10 MB | 100,000 |
| 1080p films at 6 GB | 166 |
| 4K films at 25 GB | 40 |
| Modern games at 100 GB | 10 |
The last row is why storage requirements have grown so fast: a single current-generation game can occupy a tenth of a terabyte, and the same drive that held a decade of music holds ten games.
Beyond terabytes
| Unit | Bytes | Where it appears |
|---|---|---|
| Petabyte (PB) | 1000⁵ | large research datasets, media archives |
| Exabyte (EB) | 1000⁶ | global traffic figures |
| Zettabyte (ZB) | 1000⁷ | annual internet traffic estimates |
Each has an IEC counterpart — PiB, EiB, ZiB — and at these scales the binary and decimal figures diverge by 12.6%, 15.3% and 18.1% respectively. The higher the prefix, the more the choice matters.
Estimating in your head
Move the decimal point three places. 3500 GB is 3.5 TB. As with every conversion in this category, the arithmetic is trivial and the only real question is which system the number came from.