Terabytes to Gigabytes Converter (TB to GB)
1 TB = 1,000 GB in decimal units. Convert terabytes to gigabytes, and see why Windows lists a 1 TB drive as about 931 "GB" (really GiB).
Gigabyte (GB) = Terabyte (TB) × 1000
Terabyte (TB): A terabyte is 10^12 bytes, or 1,000 gigabytes. Hard drives and SSDs are sold in terabytes using this decimal definition.
Gigabyte (GB): A gigabyte is 1,000,000,000 bytes (10^9). A capacity of 500 decimal GB is about 465.66 GiB; the differing numbers describe the same number of bytes.
| Terabyte (TB) | Gigabyte (GB) |
|---|---|
| 1 | 1000 |
| 5 | 5000 |
| 10 | 10000 |
| 25 | 25000 |
| 50 | 50000 |
| 100 | 100000 |
Converting terabytes to gigabytes is simple in the decimal system: 1 TB is 1,000 GB, the definition every drive maker prints on the box. The confusion starts when the drive is plugged in, because Windows reports capacity in binary units while still labeling them GB. Tape and enterprise storage follow the same decimal rule: an LTO-9 cartridge holds 18 TB native, which is 18,000 GB, and more only when the data compresses well.
A 1 TB drive holds 1,000,000,000,000 bytes. Windows divides that by 1,073,741,824, the number of bytes in a gibibyte, and shows about 931, so nothing is missing; macOS has used decimal units since 2009 and shows close to the full 1 TB. The charts give decimal gigabytes, and the FAQ shows the binary figure for a common drive size.
How to use this tool
- Type a value in the Terabyte box to see it in gigabytes, or type in the Gigabyte box to convert the other way.
- Press ⇄ to swap the two units, or Load example for a typical value.
- Check the charts below for common values; for other units, open the Digital Storage converter.
Formula
Gigabyte (GB) = Terabyte (TB) × 1000
Terabyte (TB) = Gigabyte (GB) × 0.001
Both factors come from exact definitions: 1 gigabyte = 0.001 terabytes and 1 terabyte = 1000 gigabytes (shown to 12 significant digits).
Example
Two conversions worked with the same factors the converter uses:
2 TB × 1000 = 2000 GB
1500 GB × 0.001 = 1.5 TB
Terabyte to Gigabyte chart
Common values from terabytes to gigabytes, rounded to four decimal places.
| Terabyte (TB) | Gigabyte (GB) |
|---|---|
| 0.25 | 250 |
| 0.5 | 500 |
| 0.75 | 750 |
| 1 | 1,000 |
| 1.2 | 1,200 |
| 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 |
| 14 | 14,000 |
| 16 | 16,000 |
| 20 | 20,000 |
| 24 | 24,000 |
| 30 | 30,000 |
| 50 | 50,000 |
| 100 | 100,000 |
Gigabyte to Terabyte chart
The reverse direction for values people often look up.
| Gigabyte (GB) | Terabyte (TB) |
|---|---|
| 80 | 0.08 |
| 160 | 0.16 |
| 250 | 0.25 |
| 640 | 0.64 |
| 1,500 | 1.5 |
| 3,500 | 3.5 |
| 4,500 | 4.5 |
| 7,000 | 7 |
| 12,000 | 12 |
| 15,000 | 15 |
Capacities sold in terabytes
| Item | Terabyte (TB) | Gigabyte (GB) |
|---|---|---|
| Laptop SSD, a common size | 0.5 | 500 |
| Portable hard drive, a common entry size | 1 | 1,000 |
| PlayStation 5 Pro internal SSD | 2 | 2,000 |
| 4K video at 100 Mbps, recorded for a week nonstop | 7.56 | 7,560 |
| LTO-8 tape cartridge, native capacity | 12 | 12,000 |
| LTO-9 tape cartridge, native capacity | 18 | 18,000 |
Quick mental estimate
Multiply by 1,000 for decimal GB: 4 TB → 4,000 GB. To predict what Windows will display, multiply by about 931 instead: 4 TB → about 3,725 GiB.
Use the converter or the charts when the exact figure matters.
The two units
Terabyte (TB): A terabyte is 10^12 bytes, or 1,000 gigabytes. Hard drives and SSDs are sold in terabytes using this decimal definition.
Gigabyte (GB): A gigabyte is 1,000,000,000 bytes (10^9). A capacity of 500 decimal GB is about 465.66 GiB; the differing numbers describe the same number of bytes.
Frequently asked questions
Why does my 2 TB drive show only 1.81 TB?
The drive holds 2,000,000,000,000 bytes, which Windows divides by 1,024 four times and labels TB; the result is really about 1.82 TiB, displayed as 1.81. No space is missing apart from a small amount used by the file system.
How many GB is 2 TB?
2 TB is exactly 2,000 GB in decimal units, or about 1,863 GiB in binary units. An 8 TB drive likewise holds 8,000 GB, which a binary display shows as about 7,451 GiB.
Is a terabyte 1,000 or 1,024 gigabytes?
A terabyte (TB) is 1,000 gigabytes. The binary unit built from 1,024 steps is the tebibyte (TiB), which is 1,024 GiB, or about 1.0995 TB.
How precise is the result?
The converter uses the exact definitions above with browser floating-point arithmetic and shows up to 12 significant digits. The charts round to four decimal places for reading.
Sources
Last updated:
Page address with these inputs: https://kakao.mobile/tools/terabyte-to-gigabyte-converter/
Cite or embed this tool
kakaoCalc. (2026, November 8). Terabytes to Gigabytes Converter (TB to GB). https://kakao.mobile/tools/terabyte-to-gigabyte-converter/
“Terabytes to Gigabytes Converter (TB to GB).” kakaoCalc, 8 Nov. 2026, kakao.mobile/tools/terabyte-to-gigabyte-converter/.
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