KB to MB Converter
Convert file sizes between Kilobytes (KB) and Megabytes (MB) instantly. Enter a value in either field below and the converter will update automatically — no need to press a button.
What is a Kilobyte (KB)?
A kilobyte is a unit of digital information storage. In computing, it is most commonly treated as 1,024 bytes (based on binary/base-2 counting), and is used to measure the size of small files such as text documents, plain images, and short audio clips.
What is a Megabyte (MB)?
A megabyte is a larger unit of digital storage, equal to 1,024 kilobytes in the binary convention used by most operating systems and software. Megabytes are commonly used to measure the size of photos, songs, documents, and app downloads.
KB to MB Formula
To convert Kilobytes to Megabytes, divide the KB value by 1,024:
To convert Megabytes back to Kilobytes, multiply by 1,024:
Common Uses
- Checking email attachment size limits
- Comparing photo and image file sizes
- Estimating document or PDF sizes
- Understanding app or software download sizes
- Managing storage space on phones and computers
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Frequently Asked Questions
Is 1 MB exactly 1000 KB or 1024 KB?
Most operating systems and software (Windows, macOS file sizes) use the binary standard, where 1 MB = 1024 KB. Some storage manufacturers use the decimal standard, where 1 MB = 1000 KB. This converter uses the binary (1024) standard, which is the most common in everyday computing.
How many MB is a typical photo?
A typical smartphone photo is usually between 2 MB and 8 MB, depending on resolution and compression.
Why do file sizes sometimes look different on different devices?
This usually happens because some systems calculate file size using 1000 as the base (decimal) while others use 1024 (binary), leading to slightly different displayed values for the same file.