File Size Calculators — Video, Audio and Screen Recordings

File size comes down to one formula — bitrate × time ÷ 8 — and the judgement comes from knowing which bitrate your content and destination actually need. These calculators estimate exports before you render, check whether a video fits an upload limit, and size screen-recording sessions before the disk fills. The video page covers 1080p through 8K with H.264, H.265 and AV1 factors; the bitrate page reverses the maths to hit a target size or a platform's delivery spec; the audio page handles MP3, AAC, FLAC and WAV; and the recording page translates OBS-style presets into gigabytes per hour.