How to convert terabytes to gigabytes
One terabyte equals 1,000 gigabytes, so multiply the number of terabytes by 1,000:
GB = TB × 1,000
TB = GB ÷ 1,000 (1 GB = 0.001 TB)
Example: 2 TB → 2 × 1,000 = 2,000 GB.
Going the other way, divide by 1,000, or multiply by 0.001; the gigabytes to terabytes converter does it for you.
Everyday values
| Terabytes | Gigabytes | For example |
|---|---|---|
| 1 TB | 1,000 GB | one terabyte |
| 2 TB | 2,000 GB | a backup drive |
| 4 TB | 4,000 GB | a NAS drive |
| 10 TB | 10,000 GB | 10 TB |
When you need this conversion
Multiply terabytes by 1,000 to get gigabytes. For backup planning, see the storage estimates in our calculator list.
Terabyte to gigabyte conversion table
| TB | GB | TB | GB |
|---|---|---|---|
| 0.5 TB | 500 GB | 5.5 TB | 5,500 GB |
| 1 TB | 1,000 GB | 6 TB | 6,000 GB |
| 1.5 TB | 1,500 GB | 6.5 TB | 6,500 GB |
| 2 TB | 2,000 GB | 7 TB | 7,000 GB |
| 2.5 TB | 2,500 GB | 7.5 TB | 7,500 GB |
| 3 TB | 3,000 GB | 8 TB | 8,000 GB |
| 3.5 TB | 3,500 GB | 8.5 TB | 8,500 GB |
| 4 TB | 4,000 GB | 9 TB | 9,000 GB |
| 4.5 TB | 4,500 GB | 9.5 TB | 9,500 GB |
| 5 TB | 5,000 GB | 10 TB | 10,000 GB |
About the units
- Terabyte (TB): 10¹² bytes (SI prefix).
- Gigabyte (GB): 1,000,000,000 bytes (SI prefix).
Both are units of digital storage. The conversion factor comes from the exact definitions above, so the calculator is exact; results are only rounded for display (up to six significant digits).
Frequently asked questions
How many gigabytes are in one terabyte?
One terabyte is 1,000 gigabytes. One gigabyte is 0.001 terabytes.
How do I convert terabytes to gigabytes?
Multiply the value in terabytes by 1,000. To go back, divide by 1,000.
What is 2 TB in gigabytes?
2 TB = 2,000 GB.
What is 4 TB in gigabytes?
4 TB = 4,000 GB.
Sources
- NIST Special Publication 811 (2008), Guide for the Use of the International System of Units (SI), Appendix B: conversion factors.
- NIST Handbook 44 (2024), Appendix C: General tables of units of measurement.
Last reviewed 5 October 2026. Results are estimates; see our disclaimer.