Free bitrate calculator for video and audio. Get file size from bitrate and duration, find the bitrate for a target size, or estimate duration.
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Whether you're encoding video for streaming, archiving, or sharing, understanding bitrate is crucial. Our calculator helps you balance quality and file size by computing the relationship between bitrate, duration, and storage requirements.
Bitrate measures how much data is processed per second in a video or audio file, typically in Mbps (megabits per second) or Kbps (kilobits per second). Higher bitrates mean better quality but larger files. The relationship is simple: File Size = Bitrate × Duration.
Bitrate Formula
1080p recommended: 8 Mbps. A 10-minute video ≈ 600 MB.
720p60 at 4,500 Kbps. 3-hour stream ≈ 6 GB local recording.
Calculate storage needs for 24/7 recording at various quality levels.
Plan how much content fits on physical media at target quality.
Know how much space your video recordings or archives will need.
Set appropriate bitrates for your upload bandwidth and platform requirements.
Balance visual quality against file size constraints.
Common recommendations: 720p (4-6 Mbps), 1080p (8-12 Mbps), 4K (35-68 Mbps). Double these for high-motion content like sports or gaming. Streaming platforms have specific requirements.
CBR (Constant Bitrate) maintains a fixed rate throughout - predictable file sizes but inefficient. VBR (Variable Bitrate) adjusts based on content complexity - better quality per MB but harder to predict file size.
Yes, but it's typically a small percentage of total. 128-320 Kbps for music, 64-128 Kbps for voice. In a 10 Mbps video, audio might be 0.1-0.3 Mbps - less than 3% of total.
This calculator provides theoretical values. Actual files include container overhead, variable bitrate fluctuations, and codec efficiency. Expect 5-15% variance from calculated values.