Data Storage Converter
Convert between bits, bytes, and their decimal (KB, MB, GB, TB) and binary (KiB, MiB, GiB, TiB) multiples — the exact units used for file sizes, storage capacity, and network speed.
Results from this calculator are estimates provided for general informational purposes only, based on formulas, rates, and standards commonly accepted as of 2026. Figures may differ slightly from other calculators or professional sources due to rounding methods, differing assumptions, or regional regulations, and rules may change over time. Always consult a qualified professional — such as a financial advisor, healthcare provider, or other relevant specialist — before making decisions based on these results.
Result
1 GB = 1000 MB
1 Gigabyte = 1000 Megabytes
1 Megabyte = 0.001 Gigabytes
1 GB in every supported unit
What is a Data Storage Converter?
A data storage converter translates a quantity of digital information — a file size, a drive capacity, a download — from one unit into its equivalent in another, such as turning gigabytes into megabytes, or bits into bytes. Unlike most measurement families, data storage has two competing sets of prefixes for the same names: decimal units (kilobyte, megabyte, gigabyte, terabyte), which scale by powers of 1,000 and are used by storage manufacturers and networking standards, and binary units (kibibyte, mebibyte, gibibyte, tebibyte), which scale by powers of 1,024 and reflect how memory and file systems are actually addressed in hardware.
Every unit below is defined relative to the byte, so any conversion — bit to byte, decimal to binary, or across magnitudes — reduces to a single multiplication.
Conversion chart: Gigabyte to Megabytes
Conversion table
| Gigabyte (GB) | Megabyte (MB) |
|---|---|
| 0.01 GB | 10 MB |
| 0.1 GB | 100 MB |
| 1 GB | 1000 MB |
| 2 GB | 2000 MB |
| 3 GB | 3000 MB |
| 5 GB | 5000 MB |
| 10 GB | 10000 MB |
| 20 GB | 20000 MB |
| 50 GB | 50000 MB |
| 100 GB | 100000 MB |
| 1000 GB | 1000000 MB |
Supported Units
| Unit | Symbol | In Bytes |
|---|---|---|
| Bit | bit | 0.125 B |
| Byte | B | 1 B |
| Kilobyte | KB | 1000 B |
| Megabyte | MB | 1000000 B |
| Gigabyte | GB | 1E+09 B |
| Terabyte | TB | 1E+12 B |
| Kibibyte | KiB | 1024 B |
| Mebibyte | MiB | 1048576 B |
| Gibibyte | GiB | 1.07374E+09 B |
| Tebibyte | TiB | 1.09951E+12 B |
About These Parameters
- Value
- The number you want to convert, expressed in the "From" unit. Accepts decimals.
- From Unit
- The unit your input value is currently measured in.
- To Unit
- The unit you want the result converted into. Use the swap button to flip From and To instantly.
How Data Storage Conversion Works
The Formula
Every unit here is defined by a fixed multiplier relative to the byte. To convert a value from one unit to another:
result = value × (factor of "From" unit ÷ factor of "To" unit)
For Gigabyte → Megabyte: multiply by 1000. For example, 1 GB × 1000 = 1000 MB.
Decimal (1000) vs. Binary (1024)
Data storage is the one measurement family where the same prefix means two different things. Storage manufacturers, and the SI and IEC standards bodies, define a kilobyte as exactly 1,000 bytes, a megabyte as 1,000,000 bytes, and so on — clean powers of ten, matching every other metric prefix. But because computer memory is physically organized in powers of two, operating systems have long used the same labels — "KB," "MB," "GB" — to mean powers of 1,024 instead: 1,024 bytes, 1,048,576 bytes, and so on. This converter treats the decimal units (kilobyte, megabyte, gigabyte, terabyte) and the binary units (kibibyte, mebibyte, gibibyte, tebibyte) as distinct, precisely defined units so there is no ambiguity — 1 kilobyte is always 1,000 bytes, and 1 kibibyte is always 1,024 bytes.
This is exactly why a drive advertised as "500 GB" (500,000,000,000 bytes under the manufacturer's decimal definition) shows up as roughly "465 GB" in Windows' File Explorer — Windows is dividing that same byte count using binary gibibyte math (2^30 bytes per unit) while still displaying the label "GB" instead of the technically correct "GiB." No storage is missing; two different definitions of the same word are being compared.
Bits vs. Bytes: Why Network Speeds Look Slower Than They Are
Internet and Wi-Fi speeds are almost always advertised in bits per second (Mbps or Gbps), while file sizes and download progress bars are shown in bytes (MB or GB) — and there are 8 bits in a byte. A connection advertised as "100 Mbps" therefore has a real-world maximum download speed of about 100 ÷ 8 = 12.5 megabytes per second, not 100 megabytes per second. This single unit mismatch is one of the most common sources of confusion in consumer networking, and it is worth double-checking whenever comparing an advertised connection speed to an actual download time.
Example
1 GB equals 1000 MB. For scale, that's about 200× a typical high-resolution smartphone photo (5 MB, or 0.005 GB).
Frequently Asked Questions
Why does my new hard drive show less space than advertised?
Manufacturers advertise capacity using decimal gigabytes (1 GB = 1,000,000,000 bytes), while your operating system typically calculates and displays free space using binary gibibytes (1 GiB = 1,073,741,824 bytes) but still labels it "GB." The byte count is identical — only the unit definition used to display it differs, so a 500 GB drive reads as about 465 "GB" in Windows.
What is the difference between a bit and a byte?
A bit is a single binary digit (0 or 1); a byte is a group of 8 bits and is the smallest unit typically used to represent a character of data. Network and internet speeds are conventionally measured in bits per second, while file and storage sizes are measured in bytes, so an "8 Mbps" connection transfers roughly 1 megabyte per second at best.
Should I use KB/MB/GB or KiB/MiB/GiB?
Use the decimal units (KB, MB, GB, TB) when matching a manufacturer's advertised storage capacity or a network speed. Use the binary units (KiB, MiB, GiB, TiB) when you need the exact power-of-two value a computer uses internally, such as memory addressing or precise free-space reporting — this converter supports both so you can convert accurately between either system.