File Size Converter
Convert between bytes, KB, MB, GB, TB in decimal and binary
📐 DECIMAL (SI) — 1 KB = 1,000 B
💻 BINARY (IEC) — 1 KiB = 1,024 B
Decimal vs Binary File Sizes
Storage manufacturers use decimal units (1 KB = 1,000 bytes), which is why a "500 GB" drive shows up as ~465 GiB in your OS. Operating systems use binary units (1 KiB = 1,024 bytes). This causes the apparent "shrinkage" you see.
Frequently Asked Questions
Why does my 1 TB hard drive show less space?
Manufacturers define 1 TB = 1,000,000,000,000 bytes (decimal). Your OS shows it in binary units: 1,000,000,000,000 ÷ 1,099,511,627,776 ≈ 0.909 TiB, which it may display as ~909 GB.
What is the difference between KB and KiB?
KB (kilobyte) = 1,000 bytes in SI. KiB (kibibyte) = 1,024 bytes in IEC. The IEC introduced KiB, MiB, GiB to eliminate ambiguity, but KB is still commonly used for both.
How many MB is a typical photo?
A JPEG photo from a smartphone is typically 2–6 MB. RAW photos can be 15–30 MB. A short 1-minute 4K video can be 200–400 MB.
How many bytes is 1 GB?
Decimal: 1 GB = 1,000,000,000 bytes. Binary: 1 GiB = 1,073,741,824 bytes.
What is the largest file size unit?
After Petabyte comes Exabyte (10^18), Zettabyte (10^21), and Yottabyte (10^24). The total data created/consumed worldwide is measured in Zettabytes per year.