How this calculation works
Compare data sizes without mixing decimal prefixes such as MB and GB with binary prefixes such as MiB and GiB. A byte contains eight bits. Decimal units grow by powers of 1,000, while binary units grow by powers of 1,024. The same stored data can therefore have different numerical sizes without any bytes being lost.
Worked example
This example uses illustrative inputs. Your current result is shown above.
Converting 1 GiB to MB gives 1 × 1,073,741,824 ÷ 1,000,000 = 1,073.741824 MB. By contrast, 1 GB is exactly 1,000 MB. Converting 8,000,000 bits to MB first divides by 8, yielding 1,000,000 bytes or 1 MB.
Assumptions and limits
- The unit labels distinguish decimal and binary prefixes explicitly. GB and GiB are not interchangeable.
- This converts a data amount, not a transfer duration. To estimate download time you also need a speed and an allowance for overhead.
- Filesystems, formatting and reserved storage can reduce usable disk capacity. Prefix conversion alone does not account for those differences.
Questions people ask
Why does a 1 GB size show less than 1 GiB?
A GiB contains more bytes than a GB. Dividing the same 1,000,000,000 bytes by 1,073,741,824 gives about 0.9313 GiB; the byte count has not changed.
Are MB and Mb the same?
No. MB means megabytes and Mb means megabits; one byte has eight bits. Internet speeds are often expressed in megabits per second, not megabytes.
Does this explain all of my missing disk space?
No. Decimal versus binary display explains one part. Formatting, operating-system files and reserved partitions can also use capacity.