How to convert terabytes to tebibytes
One terabyte equals 0.909495 tebibytes, so multiply the number of terabytes by 0.909495:
TiB = TB × 0.909495
TB = TiB ÷ 0.909495 (1 TiB = 1.0995 TB)
Example: 0.5 TB → 0.5 × 0.909495 = 0.454747 TiB.
Going the other way, divide by 0.909495, or multiply by 1.0995.
Everyday values
| Terabytes | Tebibytes | For example |
|---|---|---|
| 0.5 TB | 0.454747 TiB | a 500 GB drive (465.66 GiB) |
| 1 TB | 0.909495 TiB | a 1 TB drive |
| 2 TB | 1.819 TiB | a 2 TB drive |
| 4 TB | 3.638 TiB | a 4 TB drive |
When you need this conversion
This explains the classic "missing space" puzzle. Drive makers use decimal units (1 TB = 10¹² bytes), but Windows reports sizes in binary units while labelling them "GB" and "TB". A 1 TB drive therefore appears as about 931 GB (really 931 GiB, or 0.91 TiB). No space is missing; it is the same number of bytes counted differently.
Terabyte to tebibyte conversion table
| TB | TiB | TB | TiB |
|---|---|---|---|
| 0.5 TB | 0.454747 TiB | 5.5 TB | 5.0022 TiB |
| 1 TB | 0.909495 TiB | 6 TB | 5.457 TiB |
| 1.5 TB | 1.3642 TiB | 6.5 TB | 5.9117 TiB |
| 2 TB | 1.819 TiB | 7 TB | 6.3665 TiB |
| 2.5 TB | 2.2737 TiB | 7.5 TB | 6.8212 TiB |
| 3 TB | 2.7285 TiB | 8 TB | 7.276 TiB |
| 3.5 TB | 3.1832 TiB | 8.5 TB | 7.7307 TiB |
| 4 TB | 3.638 TiB | 9 TB | 8.1855 TiB |
| 4.5 TB | 4.0927 TiB | 9.5 TB | 8.6402 TiB |
| 5 TB | 4.5475 TiB | 10 TB | 9.095 TiB |
About the units
- Terabyte (TB): 10¹² bytes (SI prefix).
- Tebibyte (TiB): 2⁴⁰ bytes (IEC binary 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 tebibytes are in one terabyte?
One terabyte is 0.909495 tebibytes. One tebibyte is 1.0995 terabytes.
How do I convert terabytes to tebibytes?
Multiply the value in terabytes by 0.909495. To go back, divide by 0.909495.
What is 0.5 TB in tebibytes?
0.5 TB = 0.454747 TiB.
What is 2 TB in tebibytes?
2 TB = 1.819 TiB.
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.