File Size Calculator
Estimate file sizes for audio recordings, video clips, and images before you record or convert. Plan storage needs and choose the right format and quality settings.
Audio File Size Calculator
3m 0s
Estimated file size
2.75 MB
MP3 · 128 kbps · 3m 0s
Need to compress audio files? Try our free Audio Compressor or convert WAV to MP3.
Quick Reference: File Size by Format
| Format | 1 min | 5 min | 1 hour |
|---|---|---|---|
| MP3 (128 kbps) | 960 KB | 4.8 MB | 57.6 MB |
| MP3 (320 kbps) | 2.4 MB | 12 MB | 144 MB |
| WAV (44.1 kHz, 16-bit) | 10.1 MB | 50.5 MB | 605 MB |
| FLAC (44.1 kHz) | ~5.5 MB | ~27.5 MB | ~330 MB |
Frequently Asked Questions
How accurate are these file size estimates?
These are close approximations based on standard encoding parameters. Actual file sizes can vary by 10-20% depending on content complexity, encoder settings, and metadata. Audio estimates are typically the most accurate.
How is audio file size calculated?
For lossy formats like MP3 and AAC: (bitrate in kbps x duration in seconds) / 8 = size in KB. For uncompressed WAV: sample rate x bit depth x channels x duration / 8. FLAC is roughly 50-60% of the equivalent WAV size.
Why do video files vary so much in size?
Video file size depends heavily on content complexity. Fast-moving action footage compresses less efficiently than a static presentation. The estimates use average bitrates for each resolution and quality setting.
What factors affect image file size?
Image file size depends on dimensions (width x height), color depth, format, and compression quality. JPG files are much smaller than PNG at the same dimensions because JPG uses lossy compression. WebP is typically 25-35% smaller than JPG.
Can I use this to plan storage needs?
Yes. Use the calculator to estimate how much disk space you need for recordings, photo shoots, or video projects. Add 15-20% buffer to the estimates for safety.
Is this calculator free?
Yes. This file size calculator is completely free with no signup required. All calculations happen instantly in your browser.