How to Convert Data Storage Units
Enter the value you want to convert in the Value field.
Select the unit to convert from in the From dropdown.
Select the unit to convert to in the To dropdown.
Click Convert to see the result.
Click Copy Result to copy the output to your clipboard.
Key Features
40+ Units Supported
Covers bytes, bits, binary prefixes (KiB, MiB, GiB), SI prefixes (KB, MB, GB), legacy units (nibble, word, DWORD), and real-world storage media (CD, DVD, Blu-ray, floppy disks, Zip and Jaz disks).
Binary and SI Standards
Distinguishes between binary kilobytes (1024 bytes) and SI kilobytes (1000 bytes), so you always get the right result whether you're working with operating system values or storage device specs.
Storage Media Reference
Includes the capacity of common physical media — CDs, DVDs, Blu-ray discs, 3.5" and 5.25" floppy disks, Zip and Jaz removable disks — useful for estimating legacy storage needs.
Privacy-First
All calculations happen entirely in your browser. No data is sent to any server.
Privacy & Security
This tool runs entirely in your browser using JavaScript. No values are sent to any server, stored, or shared. It is safe to use with any data.
Frequently Asked Questions
What is the difference between a kilobyte and a kibibyte?
A kilobyte (KB) traditionally refers to 1024 bytes in computing contexts, while a kibibyte (KiB) is the IEC-defined binary unit that always means exactly 1024 bytes. A kilobyte (SI) means 1000 bytes per the International System of Units. This converter keeps them separate so you can choose the standard that matches your context.
Why does Windows report a different file size than macOS or storage manufacturers?
Windows uses binary units (1 KB = 1024 bytes) but labels them as KB/MB/GB. Storage manufacturers use SI units (1 KB = 1000 bytes) to report larger numbers. macOS switched to SI units in 2009. Use the 'Kilobyte (SI)' or 'Megabyte (SI)' options here to match manufacturer-reported capacities.
What is a nibble?
A nibble is 4 bits, or half a byte. It can represent a single hexadecimal digit (0–F). The term is mostly used in low-level computing and digital electronics contexts.
How large is a Blu-ray disc in bytes?
A single-layer Blu-ray disc holds approximately 25,025,314,816 bytes (~25 GB). This converter uses that value for the Blu-ray option.
What is an exabyte?
An exabyte is approximately 1.15 × 10^18 bytes (or exactly 2^60 bytes in binary). It is used to describe very large data sets, such as global internet traffic or the storage capacity of large data centers.