File Tools

Free Online File Size Converter

Enter a file size and unit to instantly convert it into bytes, kilobytes, megabytes, gigabytes and terabytes.

Value

Unit

Uses 1 KB = 1024 bytes (binary convention), matching how most operating systems display file sizes.

How to use the file Size Converter

Enter a numeric file size value.
Choose the unit it's currently in — bytes, KB, MB, GB or TB.
Click 'Convert'.
See the equivalent size across all other units at once.

Example

Converting 500 MB shows it's equal to 512,000 KB, 0.49 GB, and 524,288,000 bytes.

Why convert file size units?

Storage plans, download speeds, and file listings all use different units, which makes it hard to compare sizes at a glance. This tool converts any file size across the full range of units instantly.

Binary vs. decimal sizes

This calculator uses the binary convention (1 KB = 1024 bytes), which matches how Windows, macOS and most file managers display file sizes, rather than the decimal convention used by storage manufacturers (1 KB = 1000 bytes).

Frequently asked questions

Why does my file show a different size in a store listing?

Storage manufacturers often use decimal units (1 GB = 1,000,000,000 bytes), while operating systems use binary units (1 GB = 1,073,741,824 bytes), causing the same file to appear as different sizes.

What's the largest unit this tool supports?

Terabytes (TB); let us know via the contact link if you need petabyte conversions added.

Can I convert from a smaller unit to a larger one, like KB to GB?

Yes, choose any starting unit and the tool shows the equivalent value across all other units simultaneously.

Is this useful for comparing internet download speeds?

It can help, though download speeds are usually measured in bits per second (Mbps) rather than bytes — divide by 8 to convert bits to bytes.