A video file size calculator multiplies bitrate by duration. Size in bytes is kbps × 1000 / 8 × seconds. Presets are generic 1080p and 4K rates, not a promise from OBS, H.264, or H.265. Audio is ignored unless folded into the typed bitrate.
8,000 kbps × 600 s / 8 = 600,000,000 bytes, about 572 MB. At 25 Mbps 4K the same duration is about 1.79 GB. To stay under 500 MB in 10 minutes, bitrate must stay near 7.0 Mbps.
Estimated size
572.2 MB
Results can be wrong. This calculator is unofficial. Figures can be incomplete, rounded, or not updated. Use them at your own risk and check a tape, datasheet, ball band, or official chart before cutting, mixing, buying, or publishing. Size is video bitrate × time. Audio, container overhead, and variable bitrate peaks are not included. Limits of liability are in the terms of service.
No. Same bitrate, same size. H.265 can look better at that bitrate.
Converts tempo to delay and reverb times, with tap tempo and note divisions.
Maps hertz to piano notes, cents, and MIDI at A4 = 440 or 432.
Converts pixel dimensions to inches and centimetres at a chosen DPI.
Publisher notes · reviewed 29 October 2026
Bytes = kbps × 1000 × seconds / 8. H.264 versus H.265 changes quality at a bitrate, not this size. Platform caps are not hard-coded.
Fold audio into the typed video bitrate or ignore it; 320 kbps audio is small next to 8 Mbps video.
10 min at 8 Mbps
About 572 MB.
