2 TB = 2,000 GB (decimal). In Windows, 2 TB will appear as approximately 1,862 GB because Windows uses GiB (binary) while labelling as GB.

Is 4 TB a lot of storage?

4 TB = 4,000 GB is substantial: enough for about 800,000 photos at 5 MB each, 2,000 hours of 1080p video at 4 Mbps, or a large music library of 1 million tracks.

What is the difference between TB and TiB?

TB (terabyte) = 10¹² bytes = 1,000,000,000,000 bytes. TiB (tebibyte) = 2⁴⁰ bytes = 1,099,511,627,776 bytes. 1 TB ≈ 0.909 TiB. Storage manufacturers use TB; operating systems traditionally (and incorrectly) label TiB values as TB.

Terabytes to Gigabytes Converter

1 TB = 1,000 GB (SI decimal). A 1 TB drive stores roughly 200,000 photos or 500 hours of HD video.

Inverse conversion

1,000 GB = 1 TB (SI decimal). A 1 TB SSD stores about 250,000 photos or 500 hours of HD video.

Gigabytes to Terabytes →

Formula

GB = TB × 1,000

Worked example

To convert 4 TB to GB, multiply 4 × 1,000 = 4,000 GB.

Quick reference table

TB	GB
0.5	500
1	1000
2	2000
4	4000
6	6000
8	8000
10	10000
16	16000
20	20000

Unit definitions

Terabyte (TB)

A terabyte (TB) = 1,000,000,000,000 bytes (1 trillion bytes, decimal). Standard unit for large storage devices.

Gigabyte (GB)

A gigabyte (GB) = 1,000,000,000 bytes. 1 TB = exactly 1,000 GB in the decimal system.

Common use cases

Comparing large drive capacities
Calculating available space on NAS or server arrays
Estimating backup storage needs

Megabytes to Gigabytes

Related guides

Binary vs Decimal Data Units: Bytes, Kibibytes, and Why 1 GB ≠ 1 GiB

A '1 TB' hard drive shows as 931 GB in Windows. A '16 GB' RAM stick looks like 15.3 GB in macOS. These discrepancies exist because storage manufacturers count bytes in powers of 10 while operating systems traditionally count in powers of 2. This guide explains both systems, their prefixes, and which to use when.

Frequently asked questions

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