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Calculate video file sizes from bitrate or find required bitrate for target size.
Video bitrate is the amount of data processed per second in a video stream, measured in megabits per second (Mbps). Higher bitrates produce better visual quality but result in larger file sizes — finding the right balance is key for streaming and storage.
| Resolution | Frame Rate | Bitrate |
|---|---|---|
| 720p | 30 fps | 5 Mbps |
| 1080p | 30 fps | 8 Mbps |
| 1080p | 60 fps | 12 Mbps |
| 1440p | 30 fps | 16 Mbps |
| 4K | 30 fps | 35-45 Mbps |
| 4K | 60 fps | 53-68 Mbps |
File Size:
Size (MB) = (Bitrate kbps × Duration sec) ÷ 8 ÷ 1024Note: Actual file sizes may vary slightly due to container overhead, variable bitrate encoding, and codec efficiency.
Formula
File Size (MB) = (Video kbps + Audio kbps) × Duration (sec) ÷ 8 ÷ 1024 | Bitrate (kbps) = File Size (MB) × 1024 × 8 ÷ Duration (sec)Video kbps = video bitrate converted from Mbps (1 Mbps = 1000 kbps)
Audio kbps = audio stream bitrate (e.g., 192 kbps AAC)
Duration (sec) = total video length in seconds
÷ 8 = converts kilobits to kilobytes (8 bits per byte)
÷ 1024 = converts kilobytes to megabytes
Worked Example
1080p YouTube video, 8 Mbps video + 192 kbps audio, 10 minutes
Did you know? Netflix encodes the same video at dozens of different bitrates — from 235 kbps for mobile to 16 Mbps for 4K HDR — and serves the appropriate version based on your connection speed in real time using adaptive bitrate streaming (ABR).
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