Convert GB to MB

1. How to convert GB to MB

The conversion is a single multiplication: MB = GB × 1,000. Both units are defined against the same base — the byte (B) — so the factor is fixed and the result is exact to the precision shown.

Worked at the two values people ask for most: 1 GB = 1,000 MB and 8 GB = 8,000 MB. Going the other way, GB = MB × 0.001, so 1 MB = 0.001 GB — a direction with its own page, MB to GB.

Results are given to eight significant figures. That is more precision than most jobs need — for a rough figure, use 1 GB = 1,000 MB and adjust — but rounding early and multiplying afterwards is how a small error becomes a visible one, so the full figure is what the converter carries.

2. Gigabytes to Megabytes conversion table

Every row is the same factor applied — nothing in the table is a special case, and any value in between behaves the same way. Type your own figure into the converter above and the Formula tile shows the arithmetic being used, so the result is checkable rather than taken on trust.

3. What the two units are

• Gigabytes (1000 MB) (GB). One GB is 1,000,000,000 B.
• Megabytes (1000 kB) (MB). One MB is 1,000,000 B.

Both are converted through the byte (B): the value is multiplied by its own unit's factor to reach the base, then divided by the target unit's factor to leave it. No direct GB to MB factor has to exist or be kept correct, which is also why the converter can show the same value in all 11 data & storage units at once.

Two families of prefix share similar names. kB, MB, GB and TB are decimal — powers of 1,000, as SI requires and as drive manufacturers use. KiB, MiB, GiB and TiB are binary — powers of 1,024, standardised by IEC 80000-13, and what Windows means when it displays “GB”. The gap compounds: 2.4% at kilo, 4.9% at mega, 7.4% at giga and 10.0% at tera.

If the pair you actually want is not this one, the full unit converter runs every 11 data & storage units off the same factor table, along with 11 other categories of measurement.