File Size Calculator
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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Convert File Sizes Instantly
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.
How are File Sizes Measured?
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)Why Convert File Sizes?
Storage Planning
Calculate how much storage you need for your files and backups.
Download Estimates
Understand file sizes to estimate download times and data usage.
Binary vs Decimal
Understand the difference between advertised and actual storage capacity.
How to Use the File Size Calculator
Common File Size Conversions
Photos & Images
JPEG photos are typically 2-5 MB. 1 GB holds about 200-500 photos.
Music Files
MP3 songs average 3-5 MB. A 16 GB phone holds 3,000-5,000 songs.
Video Files
HD movies are 4-8 GB. 4K videos can be 20-40 GB or more.
Documents
Word documents are typically 20-100 KB. PDFs vary from 100 KB to several MB.
Frequently Asked Questions
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.