Free video file size calculator: enter duration, video and audio bitrate and resolution to get the size in MB and GB for YouTube, TikTok and Instagram.
Professional video creators rely on video file size calculator to ensure their content meets platform requirements and looks perfect on every device. Whether you're creating for TikTok, YouTube, Instagram, or other platforms, getting the right specifications is crucial for maximizing engagement and reach.
Our video file size calculator provides instant, accurate results based on industry standards and platform guidelines. Save time, avoid trial-and-error, and create videos that perform better from the start.
This video size calculator multiplies the duration by the combined video and audio bitrate, adds 5% for container and metadata overhead, and converts the result to MB and GB. Audio defaults to 128 kbps when you leave it blank, so you only need duration, video bitrate and resolution for a quick estimate.
The resolution you pick is used to check your bitrate against a typical target, about 8,000 kbps for 1080p and 45,000 kbps for 4K, and the result flags files that will be slow to upload. Run it before exporting to see whether a Short stays under 100 MB for faster TikTok and Instagram processing.
Related calculators: video length calculator, video bitrate calculator and video storage calculator.
Size in MB = duration (seconds) × (video bitrate + audio bitrate in kbps) × 1.05 ÷ 8,192. The 1.05 covers container overhead. A 60-second 1080p clip at 8,000 kbps video and 128 kbps audio comes to about 62.5 MB.
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