Free file size calculator to convert between bytes, KB, MB, GB, TB, and PB. Supports both binary (1024-based) and decimal (1000-based) systems with practical storage examples.
Binary system (1024-based): Used by operating systems and RAM. 1 KB = 1,024 bytes.
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Understanding file sizes is essential for managing storage, planning downloads, and sharing files. Our calculator converts between all common units and shows practical comparisons like how many songs, photos, or movies fit in a given storage size.
File sizes can be measured using two systems: binary (base 1024) used by operating systems, and decimal (base 1000) used by storage manufacturers. This is why a 500 GB drive shows less capacity in your OS - it's using binary measurement.
File Size Conversion
Bytes = Value × Base^n (where n = unit level, Base = 1024 or 1000)Calculate how much storage you need for your files and backups.
Understand file sizes to estimate download times and data usage.
Understand the difference between advertised and actual storage capacity.
JPEG photos are typically 2-5 MB. 1 GB holds about 200-500 photos.
MP3 songs average 3-5 MB. A 16 GB phone holds 3,000-5,000 songs.
HD movies are 4-8 GB. 4K videos can be 20-40 GB or more.
Word documents are typically 20-100 KB. PDFs vary from 100 KB to several MB.
Storage manufacturers use decimal (1 TB = 1,000 GB), but your OS uses binary (1 TiB = 1,024 GiB). A '1 TB' drive is actually about 931 GiB in binary terms.