Free · Computer related converters

Kilobytes, Megabytes & Mebibytes

Convert a single data size between decimal kilobytes, decimal megabytes and binary mebibytes with unambiguous unit labels.

Calculator inputs

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Enter the known values in the units shown. Results update as you type.
Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
Use the worked example to check the method. Reset restores the starting fields.

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

1,000 kB is 1 MB and 0.95367431640625 MiB. A decimal megabyte contains 1,000,000 bytes; a mebibyte contains 1,048,576 bytes.

MB = kB / 1000; MiB = kB × 1000 / 1,048,576

Enter these known values and leave the other values blank.

The three fields describe the same byte quantity. kB and MB use powers of 1,000; MiB uses 2²⁰ bytes.
A kibibyte (KiB) is 1,024 bytes and is not the same as a kilobyte. Convert a KiB count to kB by multiplying it by 1.024 before using that field.
Nonnegative decimal quantities are accepted for unit arithmetic. Files have whole-byte sizes, but displayed storage quantities may already be rounded.

A mebibyte contains more bytes than a decimal megabyte. The same total byte count therefore occupies fewer MiB than MB.

No. A byte is eight bits. These fields use bytes throughout, with an uppercase B.

Bookify keeps decimal kB and MB distinct from binary MiB and corrects the binary equation so all three values represent the same number of bytes.