ToolWren › Data Size

Data Storage Converter

Convert digital storage sizes between bytes, kilobytes, megabytes, gigabytes and terabytes — including binary (KiB/MiB/GiB) units.

100% client-side · nothing is uploaded

Loading tool…

How to use the Data Size

Enter the number you want to convert in the Value field.
Pick the unit you're converting From and the unit you want To.
Read the converted result, or use ⇅ to swap the two units.
Check the All units table to see your value expressed in every supported unit at once.

Privacy: this tool runs entirely in your browser. Your input is never sent to, received by, or stored on any server — there are no uploads and no tracking of what you enter.

About Data Size

Decimal vs binary units

Storage is sold in decimal units (1 KB = 1000 bytes) but operating systems often count in binary (1 KiB = 1024 bytes). That is why a 1 TB drive shows as about 931 GiB.

The units

Decimal: KB, MB, GB, TB (powers of 1000). Binary: KiB, MiB, GiB, TiB (powers of 1024). Bits are 1/8 of a byte.

Where it helps

Estimating file and backup sizes, RAM and disk capacity, and reconciling advertised vs actual drive space.

Frequently asked questions

Why does my 1TB drive show less space?

Drives use decimal TB but the OS counts binary TiB, so 1 TB is about 0.909 TiB.

What is the difference between MB and MiB?

1 MB = 1,000,000 bytes; 1 MiB = 1,048,576 bytes.

How many bits in a byte?

8 bits make 1 byte.