How to Calculate Video File Size

Video file size (in MB) = (Bitrate in Mbps × Duration in seconds) ÷ 8

For example: a 5-minute video at 8 Mbps = (8 × 300) ÷ 8 = 300 MB

Typical Bitrates by Resolution

• 480p: 1-2 Mbps → ~45-90 MB/10 min
• 720p: 2.5-5 Mbps → ~112-225 MB/10 min
• 1080p: 5-10 Mbps → ~225-450 MB/10 min
• 4K: 25-80 Mbps → ~1.1-3.6 GB/10 min

Uncompressed vs Compressed

Raw uncompressed 4K video is hundreds of times larger than compressed — a single frame of 4K at 8-bit depth is about 24MB uncompressed. Modern codecs like H.264 reduce this to under 1MB equivalent per second of video.

When to Compress

• File is too large to email (>25MB)
• Upload is taking too long
• Platform has a file size limit
• Storage is running low

Use Video Compressor to reduce video to your target file size.