GB to GiB Converter
Convert gigabytes to gibibytes and back. 1 gigabyte = 0.931322574615 gibibytes (rounded).
Tip: Results show up to 8 significant digits. The factors and their sources are listed on the "Where our numbers come from" page.
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GB and GiB
One gigabyte is about 0.931322574615 gibibytes, and one gibibyte is exactly 1.073741824 gigabytes. The converter works both ways: use the two tabs at the top of the tool to choose the direction.
Quick conversion table
GB to GiB
| GB | GiB |
|---|---|
| 1 GB | 0.93132257 GiB |
| 8 GB | 7.4505806 GiB |
| 16 GB | 14.901161 GiB |
| 32 GB | 29.802322 GiB |
| 64 GB | 59.604645 GiB |
| 128 GB | 119.20929 GiB |
| 256 GB | 238.41858 GiB |
| 500 GB | 465.66129 GiB |
| 512 GB | 476.83716 GiB |
| 1,000 GB | 931.32257 GiB |
| 2,000 GB | 1,862.6451 GiB |
| 4,000 GB | 3,725.2903 GiB |
GiB to GB
| GiB | GB |
|---|---|
| 1 GiB | 1.0737418 GB |
| 8 GiB | 8.5899346 GB |
| 16 GiB | 17.179869 GB |
| 32 GiB | 34.359738 GB |
| 64 GiB | 68.719477 GB |
| 128 GiB | 137.43895 GB |
| 256 GiB | 274.87791 GB |
| 465 GiB | 499.28995 GB |
| 512 GiB | 549.75581 GB |
| 931 GiB | 999.65364 GB |
| 1,024 GiB | 1,099.5116 GB |
Exact factor and source
| Conversion | Value | Basis |
|---|---|---|
| 1 gigabyte in gibibytes | 0.931322574615 | rounded to 12 digits. SI Brochure, 9th edition (BIPM 2019): SI prefix giga = 10^9; 1 GB = 10^9 B |
| 1 gibibyte in gigabytes | 1.073741824 | exact. IEC 80000-13 / NIST binary prefixes: 1 GiB = 2^30 B = 1,073,741,824 B |
How to convert gigabytes to gibibytes
- Step oneTake the number of gigabytes.
- Step twoMultiply it by 0.931322574615.
- Step threeThe result is the number of gibibytes.
- Step fourTo go back, divide by 0.931322574615, or multiply by 1.073741824.
Example: 500 GB x 0.931322574615 = 465.661287308 GiB.
All data size units compared
Each unit written in bytes, the base unit of this tool. Exact values come straight from the definitions.
| Unit | Symbol | Value in bytes |
|---|---|---|
| Bytes | B | 1 byte |
| Kilobytes | kB | 1,000 bytes |
| Megabytes | MB | 1,000,000 bytes |
| Gigabytes | GB | 1,000,000,000 bytes |
| Terabytes | TB | 1,000,000,000,000 bytes |
| Kibibytes | KiB | 1,024 bytes |
| Mebibytes | MiB | 1,048,576 bytes |
| Gibibytes | GiB | 1,073,741,824 bytes |
| Tebibytes | TiB | 1,099,511,627,780 bytes |
What is a gigabyte?
A gigabyte (GB) is 1,000 megabytes, or 1,000,000,000 bytes, in the decimal SI system. The binary gibibyte (GiB) is 1.073741824 GB, which is why a drive sold in GB can show a smaller number in software that counts in GiB.
What is a gibibyte?
A gibibyte (GiB) is 1,073,741,824 bytes (1,024 mebibytes), a binary unit defined by IEC. It equals 1.073741824 GB.
What this converter does not do
- Results are rounded for display to 8 significant digits; the stored factor is the exact one.
- Decimal units (kB, MB, GB) and binary units (KiB, MiB, GiB) are different sizes, and the tool does not guess which one a program means.
- It converts sizes only; it does not estimate download times or compression.
Frequently asked questions
How many gibibytes are in a gigabyte?
1 gigabyte is about 0.931322574615 gibibytes. The factor is rounded to 12 significant digits.
How many gigabytes are in a gibibyte?
1 gibibyte is exactly 1.073741824 gigabytes.
Why does a 500 GB drive show a smaller number on some computers?
Drive makers count in decimal gigabytes, and some software counts in binary gibibytes: 500 GB is 465.66129 GiB, so the same drive can appear to hold less.
Where do the factors come from?
Gigabytes: SI Brochure, 9th edition (BIPM 2019): SI prefix giga = 10^9; 1 GB = 10^9 B. Gibibytes: IEC 80000-13 / NIST binary prefixes: 1 GiB = 2^30 B = 1,073,741,824 B.
References
- GB: SI Brochure, 9th edition (BIPM 2019): SI prefix giga = 10^9; 1 GB = 10^9 B
- GiB: IEC 80000-13 / NIST binary prefixes: 1 GiB = 2^30 B = 1,073,741,824 B
- NIST Special Publication 811: Guide for the Use of the International System of Units (SI), 2008 edition.
- The International System of Units (SI Brochure), 9th edition, BIPM.