Video File Size Calculator

Calculate the estimated file size of your video before compression. Enter your video's resolution, duration, and bitrate to see if it will fit Discord, WhatsApp, Email, or other platforms.

How to Use This Calculator

  1. Select your resolution - Choose from 4K, 1080p, 720p, 480p, or 360p
  2. Enter your video duration - Input the length in seconds
  3. Set your bitrate - Video bitrate in Mbps and audio bitrate in kbps
  4. View the results - See estimated file size and platform compatibility

Why Calculate Video File Size?

Knowing your video's file size before recording or exporting helps you:

Frequently Asked Questions

How is video file size calculated?

Video file size is calculated by multiplying the bitrate (in bits per second) by the duration, then converting to bytes. The formula is: File Size (MB) = (Video Bitrate in Mbps × Duration in seconds) / 8 + (Audio Bitrate in kbps × Duration) / 8000.

What bitrate should I use for different resolutions?

For 4K video, use 15-30 Mbps. For 1080p, use 5-10 Mbps. For 720p, use 2.5-5 Mbps. For 480p, use 1-2.5 Mbps. Lower bitrates result in smaller files but may reduce quality.

Does resolution affect file size?

Resolution doesn't directly affect file size - bitrate does. However, higher resolutions typically need higher bitrates to maintain quality, which increases file size. A 4K video at 5 Mbps would be the same size as a 720p video at 5 Mbps, but the 4K would look worse.

How can I reduce my video file size?

To reduce file size: lower the resolution (e.g., 1080p to 720p), reduce the bitrate, shorten the duration, or use a more efficient codec like H.265/HEVC. ClipBunny can automatically compress your videos while maintaining quality.

Video Too Large?

Compress your video to any size with ClipBunny - free and private.

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