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Bytes Converter
Convert between bytes, KiB, MB, GB and bits, in both systems.
Any unit — B, KiB, MB, GB, TiB, bits, Mbit — or a bare number, which is read as bytes.
Quick Tool Overview
The Bytes Converter shows a size in every unit at once — the 1024 system, the 1000 system and bits — side by side, which is the only way the gap between a drive’s advertised capacity and the figure your operating system reports stops being mysterious.
- What it does
- Converts a data size between every unit
- You give it
- A size in any unit, or a bare number
- You get back
- Binary units, decimal units and bits
- Best for
- Disk sizes, bandwidth and file limits
About the Bytes Converter
Enter a size in any unit and see it in every other one at once — the binary units, the decimal units and bits, side by side rather than one conversion at a time.
The reason this is confusing is that there are genuinely two systems. A kibibyte (KiB) is 1,024 bytes and a kilobyte (kB) is 1,000, which is why a 1 TB drive shows as 931 GB in Windows: the manufacturer counted in powers of ten and the operating system displayed powers of two, using the same three letters for both. This converter shows both readings together, so the gap is visible rather than mysterious, and it says which reading it used for an ambiguous unit.
Key features of the Bytes Converter
Both systems together
KiB and kB in the same table, so the 7% gap that turns 1 TB into 931 GB is visible rather than surprising.
Ambiguity reported
MB can mean either, and the page says which reading it used — a lower-case kB is treated as SI, because nobody writing it that way means 1024.
Bits alongside
Which is where the factor of eight between a quoted broadband speed and an actual download rate comes from.
Reads what you type
"1.5 GiB", "1500MB", "1,024" or a bare number — all understood, with the unit optional.
Every value copyable
Click a figure to take it, in whichever unit you needed.
How to use the Bytes Converter
-
1
Enter a size
A number with a unit, like 1.5 GiB or 1500 MB — or a bare number, read as bytes.
-
2
Read every unit
Binary, decimal and bits, all from the same value.
-
3
Compare the systems
The difference between the two readings is shown as a percentage.
-
4
Copy any figure
Click a value to take it.
Frequently asked questions
Nothing is missing. The manufacturer sold you 1,000,000,000,000 bytes — a terabyte by the decimal definition. Windows divides by 1024 three times and calls the result GB, giving 931. Both numbers describe the same drive.
KiB is unambiguously 1,024 bytes. KB is 1,000 by the SI definition and 1,024 by long-standing convention, and which one you get depends entirely on who wrote the software.
Because connection speeds are quoted in megabits and downloads are measured in megabytes. A 100 Mbit/s line delivers about 12.5 MB/s — the same speed, divided by eight.
Use the binary units with their proper names — KiB, MiB, GiB — when you divide by 1024. It costs one character and removes the ambiguity entirely.
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