By Tim King · Updated 19 September 2026

GB to TB and TB to GB Converter

How Many GB Make a TB, Dividing by 1,000 or 1,024 for Binary

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gigabytes to terabytes formula

TB = GB ÷ 1,000

1 gigabyte = 0.001 terabytes, so multiply gigabytes by 0.001. Going the other way, 1 terabyte = 1,000 gigabytes.

gigabytes to terabytes table

gigabytes (GB)	terabytes (TB)
100	0.1
128	0.128
200	0.2
250	0.25
256	0.256
500	0.5
512	0.512
750	0.75
931	0.931
1,000	1
1,024	1.024
1,500	1.5
1,863	1.863
2,000	2
2,048	2.048
3,000	3
4,000	4
5,000	5
8,000	8
10,000	10
12,000	12
16,000	16
20,000	20
50,000	50
100,000	100

How many terabytes in gigabytes?

500 GB = 0.5 TB. There are 0.5 terabytes in 500 gigabytes.

931 GB = 0.931 TB. There are 0.931 terabytes in 931 gigabytes.

1,000 GB = 1 TB. There are 1 terabytes in 1,000 gigabytes.

1,024 GB = 1.024 TB. There are 1.024 terabytes in 1,024 gigabytes.

2,000 GB = 2 TB. There are 2 terabytes in 2,000 gigabytes.

terabytes to gigabytes formula

GB = TB × 1,000

1 terabyte = 1,000 gigabytes, so multiply terabytes by 1,000, or divide by 0.001.

terabytes to gigabytes table

terabytes (TB)	gigabytes (GB)
0.1	100
0.25	250
0.5	500
0.75	750
1	1,000
1.5	1,500
2	2,000
2.5	2,500
3	3,000
4	4,000
5	5,000
6	6,000
8	8,000
10	10,000
12	12,000
14	14,000
16	16,000
18	18,000
20	20,000
24	24,000
30	30,000
40	40,000
50	50,000
64	64,000
100	100,000

How many gigabytes in terabytes?

1 TB = 1,000 GB. There are 1,000 gigabytes in 1 terabytes.

2 TB = 2,000 GB. There are 2,000 gigabytes in 2 terabytes.

4 TB = 4,000 GB. There are 4,000 gigabytes in 4 terabytes.

8 TB = 8,000 GB. There are 8,000 gigabytes in 8 terabytes.

20 TB = 20,000 GB. There are 20,000 gigabytes in 20 terabytes.

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How the GB To TB works

This GB to TB converter shows both the decimal and binary answers. Type a size in gigabytes and get terabytes as you type. This page divides by 1,000, the decimal definition used on drive labels, cloud plans and macOS. Windows divides by 1,024 and, for a drive, shows 0.91 TB where the box says 1 TB; the explainer below covers why, and how to read either number. Press the swap button to go the other way.

GB to TB: decimal versus binary

A gigabyte is a billion bytes and a terabyte a trillion, so 1,000 GB is 1 TB. In the binary convention, still used by Windows, the units are 2³⁰ and 2⁴⁰ bytes, properly called gibibytes and tebibytes, and 1,024 GiB is 1 TiB. A tebibyte is 10% bigger than a terabyte, so the same data has a smaller number in TiB than in TB.

Worked example: adding up drives

A 500 GB SSD, a 2,000 GB hard drive and a 256 GB phone: 2,756 GB, or 2.76 TB. Windows would show them as 465 GB, 1,863 GB and 238 GB, 2,566 GiB, which is 2.51 TiB. Both totals describe the same bytes; the 10% gap is the units.

Worked example: 931 GB

931 ÷ 1,000 = 0.931 TB. This is the number Windows shows for a 1 TB drive, because it reports gibibytes and calls them GB. 931.32 GiB × 1.0737 = 1,000 GB = 1 TB. If a figure of 931, 1,863, 3,725 or 7,451 GB turns up, it is a 1, 2, 4 or 8 TB drive reported in binary.

Worked example: a cloud storage bill

A provider charging per GB-month with 12,500 GB stored: 12.5 TB. Cloud storage is decimal, so 12.5 TB at a few cents per GB per month is a few hundred dollars. If the provider quotes quota in TiB, 12.5 TB is 11.4 TiB.

When a terabyte is the right unit

Phones and laptops are in gigabytes; external drives, NAS boxes and cloud backups are in terabytes. A household with a few phones and a camera accumulates 1–2 TB in a few years. A 4K video at 400 MB a minute reaches a terabyte in 42 hours of footage.

Rule of thumb

Move the decimal point three places to the left. 2,500 GB is 2.5 TB. To match Windows, divide by 1,024 instead: 2,500 GiB is 2.44 TiB. The binary figure is always smaller by 2.4% at this level and a total of 10% if the starting number was already decimal gigabytes converted to binary.

Worked example: a 4 TB backup drive

4 × 1,000 = 4,000 GB. In Windows it appears as 3,725 GB. A phone with 128 GB of photos and a laptop with 500 GB of files fill 628 GB of it, 16%. At 40 MB/s over USB the first full backup of that takes 4.4 hours. Photos at 4 MB each: a 4 TB drive holds about a million.

Worked example: a 2 TB cloud plan

2,000 GB. Cloud plans are decimal. A 4K video from a phone is about 400 MB a minute, so 2 TB is roughly 83 hours of it, or 500,000 photos, or 600 HD films at 3.5 GB each. Uploading 2 TB on a 20 Mbit/s upstream — 2.5 MB/s — takes nine days.

Gigabyte to terabytes formula and table

The formula on this page is TB = GB ÷ 1,000, applied exactly before rounding for display.

How many terabytes in 500 gigabytes? 500 GB is 0.5 TB. Likewise 931 GB is 0.931 TB, 1,000 GB is 1 TB, 1,024 GB is 1.024 TB.

Gigabyte to terabyte conversion table

Gigabytes (GB)	Terabytes (TB)
100	0.1
128	0.128
200	0.2
250	0.25
256	0.256
500	0.5
512	0.512
750	0.75
931	0.931
1,000	1
1,024	1.024
1,500	1.5
1,863	1.863
2,000	2
2,048	2.048
3,000	3
4,000	4
5,000	5
8,000	8
10,000	10
12,000	12
16,000	16
20,000	20
50,000	50
100,000	100

FAQ

How many GB make a TB?

1,000 GB, in decimal units, which is what manufacturers, cloud plans and macOS use. In binary, 1,024 GiB make a TiB. Windows uses binary but labels it GB and TB.

Is 500 GB half a terabyte?

Yes: 500 ÷ 1,000 = 0.5 TB. Windows shows a 500 GB drive as 465 GB, and half of the 931 GB it shows for a 1 TB drive is 465.5, so the ratio holds in either system.

Is 1 TB a lot of storage?

For documents and photos, yes: about 250,000 phone photos or millions of documents. For video it fills quickly, at 40 hours of 4K or 280 HD films. Most laptops ship with 256–512 GB; most external drives are 1–4 TB.

Why does Windows show my 1 TB drive as 0.91 TB?

Windows divides by 2⁴⁰ and labels the result TB, when it is really TiB. A trillion bytes is 0.909 TiB. The drive is 1 TB as sold; macOS and Linux show it as 1 TB or 931 GiB respectively.

How many GB are in 1 TB?

1,000 GB, in the decimal units on the box. In binary units it is 1,024 GiB, and a drive sold as 1 TB is 931 GiB, which Windows displays as "931 GB". Both numbers describe the same trillion bytes.