What Is the Video Streaming Bitrate & File Size Calculator?
Video file size is determined directly by the combined video and audio data bitrates multiplied by duration.
Resolution and frame rate do not directly dictate file size on their own—they determine the bitrate required to maintain high visual quality.
How Does the Video Streaming Bitrate & File Size Calculator Work?
Total kilobits per second is converted into megabytes per second using the binary byte ratio (8 bits per byte).
The result is scaled across the total duration.
Video Streaming Bitrate & File Size Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
Total bitrate in kilobits per second is multiplied by total duration in seconds and divided by 8 to convert bits to bytes.
How to Use the Video Streaming Bitrate & File Size Calculator
- Enter total recording or stream duration in minutes.
- Enter the target video encoding bitrate in kbps.
- Select audio track bitrate.
Step-by-Step Example Calculation
1 Hour 1080p60 Livestream at 6,000 kbps
Input Values:
Understanding Your Result
Outputs total file size in megabytes and gigabytes, along with gigabytes consumed per hour.
Factors That Affect the Result
- Variable Bitrate (VBR) vs Constant Bitrate (CBR). High-motion scenes expand VBR files.
- Video codecs (AV1 and HEVC/H.265 require ~30%–50% less bitrate than H.264 for identical quality).
When Should You Use This Calculator?
- Planning SD card storage for cameras, setting OBS livestream bitrates, and managing video archival servers.
Assumptions & Limitations
- Calculates container size with standard 1% container overhead.
Frequently Asked Questions
Calculation Accuracy & Reference Note
Deterministic mathematical bit-to-byte conversion.