Explains the distinction between decimal prefixes such as MB and binary prefixes such as MiB.
Unit conversion
GiB to MiB Converter (Gibibytes to Mebibytes)
1 GiB = 1,024 MiB. Enter a value to convert GiB to MiB, then use the formula and table below. Displayed digits may be rounded.
Data storageInstant result
Decimals
Formula result = input × 1073741824 ÷ 1048576. 1 GiB = 1,024 MiB
Nonzero results too small for the selected decimal places use scientific notation.
Nonzero results too small for the selected decimal places use scientific notation.
Common examples
One value, several units
Bytes1,073,741,824 B
Bits8,589,934,592 bit
Kilobytes1,073,741.824 kB
Megabytes1,073.7418 MB
Gigabytes1.0737 GB
Terabytes0.0011 TB
Kibibytes1,048,576 KiB
Mebibytes1,024 MiB
Conversion table
| GiB | MiB |
|---|---|
| 1 GiB | 1,024 MiB |
| 2 GiB | 2,048 MiB |
| 5 GiB | 5,120 MiB |
| 10 GiB | 10,240 MiB |
| 25 GiB | 25,600 MiB |
| 50 GiB | 51,200 MiB |
| 100 GiB | 102,400 MiB |
Conversion chart
1 GiB1,024 MiB
5 GiB5,120 MiB
10 GiB10,240 MiB
25 GiB25,600 MiB
50 GiB51,200 MiB
Worked example
1 GiB = 1,024 MiB. Apply the selected conversion formula to other input values.
Unit definition
Gibibytes (GiB) One gibibytes equals 1,073,741,824 byte.
Unit history
Gibibytes is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.
Step by step
1. Parse the value, including fractions.
2. Convert GiB to byte.
3. Convert the base value to MiB and apply your display precision.
Understand the result before using it
A gibibyte (GiB) contains 2³⁰ bytes and a mebibyte (MiB) contains 2²⁰ bytes. Their ratio is 2¹⁰, or 1,024. Multiply the GiB value by 1,024 to express the same data quantity in MiB.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
result = input × 1024
Assumptions
- Gibibytes and Mebibytes represent the same data storage quantity.
- The input is expressed in GiB; the output is expressed in MiB.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
For 1.5 GiB, calculate 1.5 × 1,024 = 1,536 MiB. For 0.25 GiB, calculate 0.25 × 1,024 = 256 MiB.
When to use it
Good uses
- Express a GiB memory allocation or storage limit in MiB.
- Compare two data quantities reported with different binary prefixes.
Limitations
Common mistakes to avoid
- GiB and MiB are binary units. GB and MB are decimal units and use different multipliers.
- This converts a data quantity, not a transfer speed; a rate also has a time denominator.
- Use the prefix actually reported by the software or specification.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
How many MiB are in one GiB?
One GiB equals 1,024 MiB. Both prefixes use powers of two.
What is 1.5 GiB in MiB?
1.5 GiB × 1,024 = 1,536 MiB.
Why does GiB to MiB use 1,024 instead of 1,000?
GiB is 2³⁰ bytes and MiB is 2²⁰ bytes. Dividing those factors gives 2¹⁰ = 1,024. Decimal GB to MB uses 1,000 instead.