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Bytes Converter

Convert between bytes, KiB, MB, GB and bits, in both systems.

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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
Developer Tools Free, unlimited use No sign-up Runs in your browser

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. 1

    Enter a size

    A number with a unit, like 1.5 GiB or 1500 MB — or a bare number, read as bytes.

  2. 2

    Read every unit

    Binary, decimal and bits, all from the same value.

  3. 3

    Compare the systems

    The difference between the two readings is shown as a percentage.

  4. 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.

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