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GB to MB Converter

Convert gigabytes to megabytes in either direction. Pick Storage (1024) for disks and files, or Transfer (1000) for data-plan style numbers.

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Gigabytes to megabytes calculator

Result

1 GB = 1,024 MB

What is a GB to MB converter?

A GB to MB converter turns gigabytes into megabytes so you can compare storage numbers that use different scales. People reach for this when a download is listed in GB, a form asks for size in MB, or a drive label does not match what the computer shows after formatting.

This page keeps the math in your browser. Type a value in either field and the other updates live. You stay in control of whether the factor is 1,024 (how most operating systems count storage) or 1,000 (how many network and marketing numbers are written).

GB to MB formula

  • Storage: MB = GB × 1,024
  • Transfer: MB = GB × 1,000
  • Reverse: GB = MB ÷ 1,024 (or ÷ 1,000 in Transfer mode)

Example: 2.5 GB in Storage mode equals 2,560 MB. The same 2.5 GB in Transfer mode equals 2,500 MB.

When this conversion is useful

  • Checking whether a 4.7 GB ISO will fit on media listed in MB
  • Comparing a phone’s free space with an app store download size
  • Explaining why a “500 GB” drive reports fewer gigabytes in Windows
  • Translating cloud backup quotas and email attachment limits into the same unit

Quick reference

Gigabytes MB (1024) MB (1000)
0.5 GB512 MB500 MB
1 GB1,024 MB1,000 MB
2 GB2,048 MB2,000 MB
5 GB5,120 MB5,000 MB
10 GB10,240 MB10,000 MB
Need smaller units or image size limits? Try the MB to KB converter & image compressor or the KB to bytes converter.

Frequently asked questions

Clear answers about gigabytes, megabytes, and which mode to pick

In Storage mode, 1 GB = 1,024 MB. In Transfer mode, 1 GB = 1,000 MB. Disks and OS file sizes usually follow 1,024; many data plans and product labels follow 1,000.

Drive makers often advertise decimal capacity. Your computer reports binary capacity. That gap—not “missing” files—is why a 1 TB drive can appear near 931 GB after you format it.

Choose Storage for files, folders, RAM, and most desktop readouts. Choose Transfer when you are matching an ISP quota, download speed claim, or packaging that uses decimal gigabytes.

Yes. No account, no watermark, and no cap on conversions. The calculation stays on your device.

Yes. Edit the megabytes box and the gigabytes value updates right away using the active mode.