File Size Converter

Convert byte quantities into all Decimal (SI: KB, MB, GB) and Binary (IEC: KiB, MiB, GiB) units.

About this tool

Understand the difference between storage manufacturer ratings (1000 base) and operating system reports (1024 base).

How to use this tool

  1. Enter byte count
  2. Inspect complete comparison table

How it works

Computes exact values across powers of 10 (SI) and powers of 2 (IEC).

When to use this tool

  • Hardware drive capacity checks
  • Cloud storage quota analysis

Frequently asked questions

Why does Windows report a 1TB drive as 931 GB?

Windows displays binary GiB while labeling it GB. 1,000,000,000,000 bytes ÷ (1024^3) = ~931.3 GiB.

Limitations

Supports up to Petabyte scale.

Privacy

Local computation only.