GB to MB Converter

Convert gigabytes to megabytes instantly. Free GB to MB converter with binary (1024) and decimal (1000) standards for storage and data planning.

1 KB = 1,024 bytes — used by OS, RAM, file sizes

1 GB =

1,024MB

Standard: Binary (1 KB = 1,024 B)

All Units

1 GB in every unit (binary)

Binary vs Decimal

Why your hard drive shows less space

1024
Binary (OS Reports)
1,073,741,824 bytes
1000
Decimal (Manufacturer)
1,000,000,000 bytes

Difference: 6.9% — this is why a "1 TB" drive shows ~931 GB in your OS

Transfer Time

Estimated time to transfer 1 GB

4G LTE (50 Mbps)2.7 min
5G (500 Mbps)16.0 sec
Wi-Fi 5 (400 Mbps)20.0 sec
Wi-Fi 6 (1 Gbps)8.0 sec
100 Mbps Broadband1.3 min
Gigabit Ethernet8.0 sec
USB 2.0 (480 Mbps)16.7 sec
USB 3.0 (5 Gbps)1.6 sec

How to Convert Gigabyte to Megabyte

Formula with a worked example (binary (1024))

To convert gigabyte (GB) to megabyte (MB), use this formula:

MB = GB × 1,024 (binary) or GB × 1,000 (decimal)

Example: Convert 4 GB to MB (binary (1024))

4 GB = 4,096 MB

To convert back, use: GB = MB ÷ 1,024 (binary) or MB ÷ 1,000 (decimal)

Gigabyte to Megabyte Conversion Table

Quick reference (binary (1024))

GBMB
0.001 GB1.024 MB
0.01 GB10.24 MB
0.1 GB102.4 MB
0.5 GB512 MB
1 GB1,024 MB
2 GB2,048 MB
5 GB5,120 MB
10 GB10,240 MB
50 GB51,200 MB
100 GB102,400 MB

Binary vs Decimal: Which Standard?

Why 1 GB can have two different values in MB

There are two ways to define how many megabyte are in a gigabyte:

Binary (1024-based)

1 GB = 1,024 MB

Used by: OS, RAM, file sizes

Decimal (1000-based)

1 GB = 1,000 MB

Used by: HDD/SSD manufacturers, networks

Fun fact: A DVD holds about 4.7 GB (4,700 MB), while a Blu-ray disc can store 25–50 GB.

When Do You Need GB to MB?

Common scenarios where this conversion comes in handy

1

checking remaining storage

2

download size estimation

3

mobile data planning

4

USB drive capacity

Frequently Asked Questions

Common questions about converting gigabyte to megabyte

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Last updated Mar 24, 2026