Tech Tools / File Size
Video File Size Calculator
Estimate storage from codec, resolution, frame rate, and duration. ProRes, DNxHR, and BRAW use published manufacturer data rates. Labeled as estimates — real files vary.
Storage visual
Disk fill animation scales to one hour of media at the current settings
What this file size calculator does
It estimates how much disk you need for a recording duration at common production codecs and bitrates.
Formula
GB approx (Mbps x seconds) / 8 / 1000 (decimal GB for drive planning; confirm your OS GiB display).
Worked example
ProRes 422 HQ ~220 Mbps for 1 hour: 220 x 3600 / 8 / 1e6 approx 99 GB.
Tips
- Leave headroom for peaks, proxies, and audio stems.
- Check the camera published data rate, not a generic 4K label.
FAQ
How do you estimate video file size from bitrate?
Size_bytes ≈ bitrate_bits_per_second × duration_seconds ÷ 8. This tool applies that for known codec presets and custom Mbps.
Is ProRes larger than H.264?
Usually yes. ProRes is mezzanine/intra-frame; H.264/H.265 are delivery codecs with much lower bitrates at similar resolution.
Should I trust the estimate for BRAW?
Treat constant-bitrate style estimates as planning numbers. RAW variants vary with detail and compression ratio — verify with a test clip.
Planning a media workflow?
From capture codecs to delivery masters, Kynetic designs end-to-end production pipelines.