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Streamer tools Recording size

Stream recording size calculator

Recording size depends on bitrate: how many kilobits per second your software writes for video and audio. Pick a preset or enter your own bitrate and duration and the calculator shows the size in gigabytes.

Preset, kbps
Per hour—
Whole recording—
Per minute—

Estimate for constant bitrate (CBR), not counting the container (MKV/MP4 add under 1%).

Everything is calculated in your browser: nothing you enter is sent anywhere.

How it works

The formula is simple: (video + audio, kbps) × seconds ÷ 8. With constant bitrate (CBR) the file comes out almost exactly this size; with variable bitrate (VBR, CQP) it is usually smaller, though busy scenes can make it larger.

Presets are typical recording bitrates at 60 frames per second. Platforms set their own limits for streaming: Twitch, for example, around 6,000 kbps. Gigabytes here are decimal, as on drive labels: 1 GB = 1,000,000,000 bytes.

FAQ

How big is one hour of 1080p recording?

At 8,000 kbps for video and 160 kbps for audio — about 3.7 GB per hour.

What bitrate should I use for recording?

For 1080p at 60 fps, 8,000–12,000 kbps is usually enough, for 720p — 4,500–6,000. The higher the bitrate, the better fast scenes look and the bigger the file.

Why is my file smaller than calculated?

In VBR and CQP modes the encoder lowers the bitrate on simple scenes, so the file is usually smaller than with a constant bitrate.

How much space does a 4-hour stream need?

At 6,000 kbps for video and 160 kbps for audio — about 11 GB. Enter your own bitrate and duration for an exact figure.

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