File Size Estimator (Video/Image)
Estimate file size for video and image files based on resolution, bitrate, duration, or compression quality.
What is File Size Estimator (Video/Image)?
The file size estimator approximates video and image file sizes based on resolution, duration, and quality. Useful for storage planning.
Formula
Video size = bitrate × duration / 8. Image size depends on resolution × bytes per pixel × compression ratio.
Worked example
1080p video at 5 Mbps for 60 seconds: 5 × 60 / 8 = 37.5 MB.
How to use this calculator
- Pick media type, resolution, and duration.
- Set quality (compression level).
- Estimated size appears.
Frequently asked questions
Why are estimates off from actual files?
Compression efficiency varies by content (slow scenes compress better than fast action). The estimates assume typical content; high-motion or noisy footage may be 50% larger.
What's the right bitrate for YouTube?
YouTube re-encodes everything anyway. Upload at 8–15 Mbps for 1080p, 35–45 Mbps for 4K. Higher bitrates don't help — YouTube re-encodes to its own standards.
JPEG vs PNG sizes?
JPEG: lossy compression, smaller files, good for photos. PNG: lossless compression, larger files, better for screenshots and graphics with text.
Should I use HEIC or HEIF?
HEIC produces ~50% smaller files than JPEG at the same quality. iOS uses it by default. Some Windows/Android systems still don't fully support it. Convert to JPEG for sharing if needed.