📁 File Size Calculator & Converter

Convert file sizes between all units instantly, calculate how many files fit in storage, and estimate image and video file sizes from resolution, bit depth, bitrate, and duration.

File Size Converter

File Size

Unit

Image Size Estimator (Uncompressed)

Width (px)

Height (px)

Bit Depth

Video File Size Estimator

Video Bitrate (Mbps)

Duration — Hours

Duration — Minutes

'Why does my downloaded file size differ from what was advertised?', 'answer' => 'File size can be reported differently by the server vs what you see on disk. Also, some sizes are in SI units (powers of 10) while OS file systems use binary units (powers of 2), creating a ~7% discrepancy at 1 GB.'], ['question' => 'What is uncompressed image size vs actual file size?', 'answer' => 'Uncompressed size (Width × Height × Bytes per pixel) is the raw data size. JPEG typically compresses to 5-20% of uncompressed size. PNG is lossless but achieves 30-80% compression. RAW files are near uncompressed.'], ['question' => 'How do I calculate video file size?', 'answer' => 'File Size (GB) = Bitrate (Mbps) × Duration (seconds) ÷ 8,000. A 2-hour 4K film at 25 Mbps = 25 × 7200 ÷ 8000 = 22.5 GB. Add 10-20% for audio tracks.'], ['question' => 'How much storage do I need for photos?', 'answer' => 'A typical modern smartphone photo is 3-8 MB in JPEG. 1 GB holds about 200-300 photos. A 1 TB external drive stores about 125,000-330,000 photos. RAW photos from DSLRs are 20-45 MB each — 1 TB holds about 22,000-50,000 RAW files.'], ]" />