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Convert GiB to MB
1 GiB = 1073.741824 MB
Type a value in gibibytes and the answer in megabytes appears as you go. The conversion is exactly 1073.741824 MB to the gibibyte, and it happens on your own machine — this page asks nothing of a server once it has loaded.
Where it runs
In your browser. The number you type is never part of a request.
Exact by definition
1 GiB is exactly 1073.741824 MB — a definition, not a rounded factor.
Answers as you type
No button, no wait. The worked answer is already on the page before any script runs.
Gibibyte and Megabyte
A gibibyte is 1,073,741,824 bytes — about 7% more than a gigabyte. Windows measures in gibibytes and labels them GB, which is the whole of the missing-space mystery.
A megabyte is a million bytes. Storage manufacturers have always used this decimal meaning, which is why their capacities look larger than what a computer reports.
gibibytes to megabytes in practice
8 GiB is 8590 MB
— the memory in a mid-range laptop.
931 GiB is 999700 MB
— what Windows reports for a one-terabyte drive.
gibibytes to megabytes at a glance
| GiB | MB |
|---|---|
| 1 | 1073.741824 |
| 2 | 2147.483648 |
| 5 | 5368.70912 |
| 10 | 10737.41824 |
| 50 | 53687.0912 |
| 100 | 107374.1824 |
| 500 | 536870.912 |
| 1000 | 1073741.824 |
Every figure here is computed from the same definition the calculator uses, so the table cannot drift away from the answer above it.
Convert GiB to MB: common questions
How many megabytes are in a gibibyte?
Exactly 1073.741824. One gibibyte is 1073.741824 megabytes, and the box above will do it for any figure you type.
Is this conversion exact, or rounded?
The ratio is exact. It is not a rounded constant typed into a table: it is derived from the definitions of the two units, so it agrees with any other correct converter to as many digits as you care to compare.
Why does another converter show a slightly different number?
Almost always rounding rather than disagreement. Many converters cut the answer to two or four decimals, and some carry a factor that was rounded before the multiplication rather than after. The figures here are computed from the exact definitions and only rounded on the way to the screen.
Where these figures come from
The claims this page makes about data units are checkable, and these are the documents that settle them.
How this page works
The factor is a constant in the page and the arithmetic is four operations, so nothing is sent anywhere and nothing needs to be. The number you type never leaves the browser — there is no request for it to travel in.