Video Size Estimator — Duration & Bitrate Free Tool
Drop in a video you own: see its duration and size, then estimate the file size at any export bitrate — before you export.
Video Duration & File Size Estimator
Drop in a video you own: see its duration and size, then estimate the file size at any export bitrate.
- Duration
- —
- Current file size
- —
- Estimated size at bitrate
- —
- Verdict
- —
How to use it
- Choose or drop your video file.
- Read its duration and current size.
- Enter an export bitrate and tap “Estimate size”.
Frequently asked questions
How is the estimate calculated?
Estimated size (MB) = bitrate (kbps) × duration (seconds) ÷ 8,000.
What bitrate should I export at?
8,000 kbps for 1080p uploads, 2,500–4,000 for WhatsApp and stories. The tool flags very low results.
Is my video uploaded?
No — the file is read locally by your browser; nothing leaves your device.
Can I use it for other people's videos?
No — only videos you own or have permission to use.
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This tool never downloads other people's Facebook, TikTok or Instagram videos. It works only on files and text you provide. See our official download-your-own-video guide.