Storage Units: KB, MB, GB and TB

Storage unit conversions are common when comparing files, phones, drives, cloud plans and upload limits. Confusion often comes from mixing decimal and binary systems.

Decimal vs Binary

Many storage products use decimal units where 1 KB = 1,000 bytes and 1 MB = 1,000,000 bytes. Some operating systems and technical tools use binary-style values where 1 KiB = 1,024 bytes and 1 MiB = 1,048,576 bytes.

Worked Examples

A 25 MB upload limit using decimal units is about 25,000,000 bytes. A 4.7 GB file is about 4,700 MB in decimal notation.

Common Mistakes

Do not assume every GB shown by a drive, phone and operating system uses the same convention. Do not forget that images, PDFs and videos can grow quickly when resolution increases.

Practical Use

For upload portals, check the exact limit and leave a buffer. If a file is close to the limit, compress or resize a copy and keep the original.