Bytes, bits, and decimal versus binary units
The main answer and comparison table describe one unchanged quantity of data using different unit definitions. A capital B means byte. The word bit is used explicitly to avoid confusing it with a byte. Fractional results are allowed as mathematical quantities, although a stored file contains a whole number of bytes.
After converting used and total capacity to the same storage unit, use the Percentage Calculator in ratio mode to express the used amount as a percentage of the total.
The formula
Decimal prefixes advance by powers of 1,000: kB, MB, GB, and TB. Binary prefixes advance by powers of 1,024: KiB, MiB, GiB, and TiB. Consequently, 1 GB is 1,000,000,000 bytes while 1 GiB is 1,073,741,824 bytes. The optional equal-size files and count method derives one source amount before applying the same unit factors.
One GiB expressed as GB
Enter 1 and select GiB as From and GB as To. The result is 1.073741824 GB. The byte quantity remains 1,073,741,824; only its presentation changes.
How to use this calculator
- Choose One known value or Equal-size files and count and enter the visible fields.
- Select the target unit and read the live equivalent and comparison table.
- Reverse this conversion reuses the numerical result in known-value mode and preserves the quantity; Reset restores the example.
Different labels can describe the same capacity
A drive label and a software display can use different prefix conventions. A smaller numeric count in a larger binary unit does not by itself mean that data or physical storage disappeared. Compare both quantities in bytes before drawing that conclusion.
Usable space can still differ because of formatting, partitions, reserved areas, or system files. This converter explains unit sizes only and does not inspect a device or estimate those overheads.
Storage amounts and transfer rates are different
An amount such as MB is not a rate such as megabits per second. To estimate a transfer duration, convert the amount and rate to matching bit or byte units and then divide amount by rate. Real transfers can include protocol overhead and pauses.
The table supports amounts through TiB and TB as source or target units. Display values are rounded to twelve significant digits, so extremely large conversions are estimates in their displayed last digits rather than exact file-size accounting.
Add equal-size files before changing storage units
Ten files of 100 MB total 1,000 MB, exactly 1 GB or approximately 0.931322574615 GiB. The entered label controls the factor: ten 100 MiB files are a different byte quantity.
File count is a whole number from one to one million, and the combined amount must stay within the source-unit input range. This is an estimate from entered equal sizes; no files are inspected and no filesystem allocation or compression overhead is added.
Retain the same quantity when reversing
Reverse this conversion uses the converted amount before display rounding and exchanges source and target units. The separate entry fields remain available when you switch back. If the converted amount is outside the input range, the entries stay in place and a message asks for another target unit.
Assumptions & limitations
What this calculation assumes
- One byte contains eight bits.
- Decimal and binary prefix meanings follow the unit explicitly selected.
What to keep in mind
- Equal-size file estimates only; no file inspection, heterogeneous file-list sum, available disk measurement or allocation overhead.
- Rounded outputs should not replace exact integer byte counts in storage allocation or billing.
Common questions
Is KB the same as KiB?
An ambiguous KB label must be checked in its original context. This tool uses kB for exactly 1,000 bytes and KiB for exactly 1,024 bytes.
Why is a byte eight times a bit?
The byte definition used here is eight bits, so dividing a bit count by eight gives the equivalent bytes.
Can I convert Mbps directly to MB?
No. Mbps includes time while MB is an amount. A duration is needed to relate a transfer rate to an amount of data.
Sources & further reading
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